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Topical›Biology 9700›Biological molecules›Carbohydrates and lipids›Paper 1

Carbohydrates and lipids — Paper 1 · A Level Biology 9700

2.2· 363 questions · 363 marks · 436 min · 2004–2025· Multiple choice

Every Cambridge A Level Biology Paper 1 question on carbohydrates and lipids, laid out as 111 A4 pages with the mark scheme below. Nothing is left out. Free to read, no account.

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Question 1: Food tests are carried out on four solutions. Which solution contains only sucrose and protein? Benedict’s acid hydrolysis iodine in biur…Question 2: During the production of apple juice, enzymes are used to break down the components of the cell walls. Which carbohydrate will be produced …Question 3: What are the features of glycogen? . . branched structural role in contains nitrogen molecule cell A Jv Jv x B Jv x Jv Cc x J x D x x JvQuestion 4: What is the name of the bond joining glycerol and a fatty acid in the formation of a monoglyceride? A ester B glycosidic C hydrogen D pepti…Question 5: Which part of a phospholipid molecule makes up most of the thickness of a cell surface membrane? A glycerol B hydrocarbon chains C hydrophi…1 / 111
Question 6: Which type of reaction takes place when starch molecules are converted into reducing sugars? A condensation B hydrolysis C polymerisation D…Question 7: The diagrams show different types of bond found in polysaccharides. 1 3 O O O O O O 2 O O O Which type or types of bond are found in amylos…Question 8: Which statement is true for cellulose, but not true for protein? A It is found in cell surface membranes. B It is synthesised from identica…Question 9: Heating with which solution breaks glycosidic bonds? A Benedict’s solution B dilute hydrochloric acid C dilute sodium hydroxide D ethanol2 / 111
Question 10: Which of the following is a polysaccharide present in human muscle? A amylose B collagen C glycogen D haemoglobinQuestion 11: The diagrams show four different molecules. P Q CH2OH CH2OH C O H O H H N C C H C C H OH OH H H HO OH C C H OH R S CH2OH O OH C O C H OH H …3 / 111
Question 12: Samples of a food were tested using Benedict’s reagent, biuret solution and ethanol. After testing, the solutions were blue with Benedict’s…Question 13: The diagram shows an α 1 : 4 glycosidic bond. CH2OH CH2OH H H H O O H H H OH H O OH H OH OH H OH H OH Which molecules contain this bond? A …4 / 111
Question 14: Which combination describes a triglyceride? hydrophilic soluble in alcohol A v v B x x Cc v x D x vQuestion 15: When hydrolysed, which molecules have products containing a carboxyl group? 1 phospholipids 2 polysaccharides 3 proteins A 1 and 2 B 1 and …Question 16: Which diagram shows part of a structural polysaccharide? O O O O A ..... O O O O O ..... O O O O B ..... O O O O O ..... O O C ..... O O O …5 / 111
Question 17: Sucrose is a disaccharide formed from two hexose sugars, α-glucose (alpha-glucose) and fructose. Which pair of monosaccharide structures wi…Question 18: Which type of molecule contains disulphide bonds and which contains glycosidic bonds? disulphide bonds glycosidic bonds A glycoprotein poly…Question 19: Which statement is true for cellulose, but not true for protein? A It is found in cell surface membranes. B It is synthesised from identica…6 / 111
Question 20: The diagram shows a triglyceride molecule that has been partially hydrolysed. H H C OH H C OH O H H H H H H H H H H C O C C C C C C C C C H…Question 21: Which statement describes how the molecular structure of starch is suited to its function? A Amylose has a branched structure and amylopect…Question 22: Which diagram represents part of the ring form of a molecule of β-glucose? A B C D H O O OH H O O H HO O O O H HO O O O OH HO H HO OH H OH …Question 23: How many fatty acid residues are normally present in a phospholipid molecule? A 1 B 2 C 3 D 4Question 24: Which feature distinguishes starch from glycogen? A Starch contains α-glucose. B Starch contains 1,6 glycosidic bonds. C Starch has an unbr…7 / 111
Question 25: Which diagram represents part of the ring form of a molecule of β-glucose? A B C D H O O OH H O O H HO O O O H HO O O O OH HO H HO OH H OH …Question 26: Which statement describes how the molecular structure of starch is suited to its function? A Amylose has a branched structure and amylopect…Question 27: Which feature distinguishes starch from glycogen? A Starch contains α-glucose. B Starch contains 1,6 glycosidic bonds. C Starch has an unbr…Question 28: How many fatty acid residues are normally present in a phospholipid molecule? A 1 B 2 C 3 D 4Question 29: Which feature distinguishes starch from glycogen? A Starch contains α-glucose. B Starch contains 1,6 glycosidic bonds. C Starch has an unbr…Question 30: Which diagram represents part of the ring form of a molecule of β-glucose? A B C D H O O OH H O O H HO O O O H HO O O O OH HO H HO OH H OH …8 / 111
Question 31: Which statement describes how the molecular structure of starch is suited to its function? A Amylose has a branched structure and amylopect…Question 32: How many fatty acid residues are normally present in a phospholipid molecule? A 1 B 2 C 3 D 4Question 33: What are the features of triglycerides? 0 0O DW > polar x x KOK less dense than water ~ Kw OK higher energy value than carbohydrates …Question 34: Which linkages are found between the glucose units in cellulose? A α 1–4 only B α 1–4 and α 1–6 C β 1–4 and α 1–6 D β 1–4 onlyQuestion 35: Which diagram shows the bond linking the individual units of both cellulose and amylose? A B C D H C O P O C C N C C C O C C O C C O OQuestion 36: Which statements about amylopectin and glycogen are correct? 1 both contain 1-4 glycosidic bonds 2 amylopectin contains β-glucose 3 glycoge…9 / 111
Question 37: The diagram shows part of a carbohydrate molecule. CH2OH C O OH HO O HO CH2OH CH2 CH2OH C O C O C O OH OH OH O O HO OH HO HO HO If all the …Question 38: Four different fruit juices, A, B, C and D, were tested with Benedict’s solution. A second sample of each juice was hydrolysed and tested w…Question 39: Which molecular bonds will be broken by hydrolysis when a molecule of glycogen is converted to glucose? bonds 1,2 1,4 1,6 A v x x key B x …10 / 111
Question 40: Some foods contain ‘hydrogenated vegetable oils’. These are unsaturated fats that have been converted to saturated fats. Which property of …Question 41: Which rows show the chemical groups present in the biological molecules listed? biological presence of carboxyl presence of two or more mol…Question 42: Which correctly matches the functional and structural features of cellulose, collagen, glycogen or triglyceride? structure molecule held …Question 43: Which polysaccharides are branched and which are unbranched? branched unbranched A amylose cellulose B amylopectin cellulose C cellulose am…11 / 111
Question 44: Three carbohydrate molecules are shown. CH2OH CH2OH CH2OH O O O OH OH OH OH OH CH2OH HO OH HO OH OH OH 1 2 3 Which two molecules combine to…Question 45: Which row describes a triglyceride? A v Jv B v x Cc x J D x x key ¥ = correct X = incorrectQuestion 46: Four different fruit juices, A, B, C and D, were tested with Benedict’s solution. A second sample of each juice was hydrolysed and tested w…Question 47: Which rows show the chemical groups present in the biological molecules listed? biological presence of carboxyl presence of two or more mol…12 / 111
Question 48: Some foods contain ‘hydrogenated vegetable oils’. These are unsaturated fats that have been converted to saturated fats. Which property of …Question 49: Which molecular bonds will be broken by hydrolysis when a molecule of glycogen is converted to glucose? bonds 1,2 1,4 1,6 A v x x key B x …Question 50: Which correctly matches the functional and structural features of cellulose, collagen, glycogen or triglyceride? structure molecule held …Question 51: Two disaccharides are maltose and sucrose. Maltose is formed from two molecules of glucose, whilst sucrose is formed from fructose and gluc…13 / 111
Question 52: The diagram shows a carbohydrate molecule. CH2OH C O OH HO O HO CH2OH CH2 CH2OH C O C O C O OH OH OH O O HO OH HO HO HO Of which polymers c…Question 53: The diagram shows a carbohydrate molecule. CH2OH C O OH HO O HO CH2OH CH2 CH2OH C O C O C O OH OH OH O O HO OH HO HO HO Of which polymers c…14 / 111
Question 54: Two disaccharides are maltose and sucrose. Maltose is formed from two molecules of glucose, whilst sucrose is formed from fructose and gluc…Question 55: Solutions of biological molecules are tested for sugars. The table shows the colours of the solutions after testing. Which may contain redu…Question 56: Tests were performed on samples from a mixture of biological molecules. When iodine in potassium iodide solution was added to a sample, the…Question 57: Which of the statements about polysaccharides can be used to describe both amylopectin and cellulose? 1 adjacent glucose molecules are rota…15 / 111
Question 58: Which molecule in the key is sucrose? is a reducing sugar yes no contains pentose sugar contains hexose sugar yes no yes no A B C DQuestion 59: Which molecules have a structural formula that contains C=O bonds? 1 fatty acids 2 glucose 3 glycerol A 1 and 2 only B 1 and 3 only C 2 and…Question 60: Glycogen is a polymer of glucose. Which description summarises its structure? A α-glucose joined by glycosidic bonds involving carbons 1 an…Question 61: Which molecules contain C=O bonds? 1 amino acids 2 fatty acids 3 proteins A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 316 / 111
Question 62: Which of the statements about polysaccharides can be used to describe both amylose and amylopectin? 1 contains 1,4 glycosidic bonds 2 conta…Question 63: Which carbohydrate gives a brick red colour when heated with Benedict’s solution? A cellulose B fructose C glycogen D sucroseQuestion 64: The diagram shows two molecules of glucose. Four possible bonding positions are labelled p, q, r, and s, and t, u, v, w. p t CH2OH CH2OH O …17 / 111
Question 65: Which molecule in the key is sucrose? is a reducing sugar yes no contains pentose sugar contains hexose sugar yes no yes no A B C DQuestion 66: Which of the statements about polysaccharides can be used to describe both amylopectin and cellulose? 1 adjacent glucose molecules are rota…Question 67: Which molecules have a structural formula that contains C=O bonds? 1 fatty acids 2 glucose 3 glycerol A 1 and 2 only B 1 and 3 only C 2 and…18 / 111
Question 68: Which row is correct for each of the molecules? β-glucose collagen haemoglobin sucrose A hexose sugar structural contains the formed by wit…Question 69: Which pair of monosaccharides form sucrose? CH2OH CH2OH H O H H O OH H H A OH H OH H OH OH OH H H OH H OH CH2OH CH2OH H O H H O H H H B OH …19 / 111
Question 70: Which statement about triglycerides is correct? A They are made up of three fatty acids combined with glycogen. B They are more saturated w…Question 71: Which molecules contain C=O bonds? 1 amino acids 2 fatty acids 3 glycerol A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3Question 72: Which of the statements about polysaccharides can be used to describe both amylose and glycogen? 1 contains 1,4 glycosidic bonds 2 contain…Question 73: Heating with which solution breaks glycosidic bonds? A Benedict’s solution B dilute hydrochloric acid C dilute sodium hydroxide D ethanol20 / 111
Question 74: The diagram shows four molecules. P Q CH2OH O O O HOCH2 OH C C C O O O C C C C C C H H H H H C C C C C C H H OH H HO OH C C C C C C C C C O…Question 75: Which molecules have a structural formula that contains C=O bonds? 1 glucose 2 glycerol 3 protein A 1 and 2 only B 1 and 3 only C 2 and 3 o…Question 76: Which of the statements about polysaccharides can be used to describe both glycogen and amylopectin? 1 contains 1,4 glycosidic bonds 2 co…Question 77: What is the general formula for starch? A (C5H10O5)n B (C5H10O6)n C (C6H12O6)n D (C6H10O5)n21 / 111
Question 78: Which of the statements about polysaccharides can be used to describe both starch and cellulose? 1 adjacent glucose molecules are rotated b…Question 79: Polymers of molecule X or polymers of molecule Y can be formed using glycosidic bonds. CH2OH CH2OH O O OH HO OH OH HO OH OH OH molecule X m…Question 80: X and Y show the structures of two hexose sugars. CH2OH CH2OH C O C O H OH H H H H C C C C HO H HO H HO H HO OH C C C C H OH H OH X Y Which…22 / 111
Question 81: The structural formula of a carbohydrate molecule can be shown as: H C O H C OH HO C H H C OH H C OH CH2OH Which of the molecules could be …Question 82: What occurs when sucrose is broken down to monosaccharides? A condensation of reducing sugars releasing water B condensation of reducing su…Question 83: One naturally occurring polysaccharide is an unbranched chain of the molecule acetylglucosamine linked by β-1, 4 glycosidic bonds. There ar…Question 84: Which molecules have properties that are dependent on hydrogen bonds? 1 cellulose 2 glycogen 3 haemoglobin 4 water A 1, 2 and 3 only B 1, 2…23 / 111
Question 85: Which describes the emulsion test for the presence of lipids? A Add ethanol and shake. B Add ethanol, pour into water and shake. C Add wate…Question 86: The structural formula of a carbohydrate molecule can be shown as: H C O H C OH HO C H H C OH H C OH CH2OH Which of the molecules could be …Question 87: The diagram shows part of a molecule of glycogen. How does the molecule differ from a molecule of amylose? A Amylose has only α-1,4 glycosi…24 / 111
Question 88: Which molecules contain a carboxyl group? 1 amino acid 2 glycerol 3 saturated fatty acid 4 unsaturated fatty acid A 1 and 2 only B 3 and 4 …Question 89: When investigating the rate of reaction of the enzyme lipase on the hydrolysis of triglycerides, the pH must be maintained at an optimum to…Question 90: The structural formula of a carbohydrate molecule can be shown as: H C O H C OH HO C H HO C H H C OH CH2OH Which of the molecules could be …25 / 111
Question 91: The diagram shows part of a molecule of a carbohydrate formed by glucose. What is the name of the molecule? A amylose B cellulose C glycoge…Question 92: A naturally occurring polysaccharide is a branched chain of α-glucose. The straight parts of the molecule are linked by α-1, 6 glycosidic b…Question 93: Which molecule has properties that are not dependent on hydrogen bonds? A cellulose B glycogen C haemoglobin D water26 / 111
Question 94: Which diagram shows the reaction that occurs to link two monomers that form cellulose? C C C C H C O H H C O H H C O H H C O H A C C C C C …Question 95: Which bonds will be broken when a molecule of glycogen is hydrolysed? 1 α-1, 4 2 β-1, 4 3 α-1, 6 4 β-1, 6 A 1 and 3 only B 2 and 4 only C 1…Question 96: Each list, 1, 2 and 3, shows some substances found in animal tissues. 1 glucose, cholesterol, triglycerides, water. 2 glycogen, antibodies,…27 / 111
Question 97: Which shows β-glucose? A B CH2OH CH2OH H C O OH H C O H H H C C C C OH H OH H HO C C H HO C C OH H OH H OH C D OH H H C O OH HO C O H H OH …Question 98: Which row is correct when one molecule of sucrose is hydrolysed? molecules of molecules of reducing sugar water A 1 1 B 1 2 C 2 1 D 2 2Question 99: The formation of glycosidic and peptide bonds is responsible for polymerisation in some biological molecules. Which bonds are found in whic…28 / 111
Question 100: Which shows the basic unit of cellulose? A B CH2OH CH2OH H C O OH H C O H H H C C C C OH H OH H HO C C H HO C C OH H OH H OH C D OH H H C O…Question 101: Which diagram shows part of a structural polysaccharide? O O O O A O O O O O O O O O B O O O O O O O C O O O O O O O O O O O D O O O O O29 / 111
Question 102: The molecule shown is a polymer of reducing sugars. CH2OH CH2OH CH2OH CH2OH O O O O OH OH OH OH O O O HO OH OH OH OH OH Which procedures co…Question 103: Which molecules show the structure of α-glucose and of β-glucose? α-glucose β-glucose CH2OH CH2OH O OH O A OH OH HO HO OH OH OH CH2OH CH2OH…30 / 111
Question 104: In unsaturated lipid molecules, where are double bonds located? A between fatty acids and glycerol B within fatty acids and within glycerol…Question 105: Which shows the basic unit of glycogen? A B CH2OH CH2OH H C O OH H C O H H H C C C C OH H OH H HO C C H HO C C OH H OH H OH C D H CH2OH H C…Question 106: Which features adapt a cellulose molecule for its function? 1 Long chains of glucose molecules coil into a helix. 2 Many hydrogen bonds for…Question 107: The structure of phospholipids and triglycerides include the following. 1 glycerol linked to fatty acids 2 hydrophobic fatty acid chains 3 …31 / 111
Question 108: A student carried out four tests for biological molecules on a solution. The results are shown in the table. test for biological observatio…Question 109: Which bonds will be broken when a molecule of amylose is hydrolysed? 1 α1,4 2 β1,4 3 α1,6 4 β1,6 A 1 and 3 B 2 and 4 C 1 only D 2 only32 / 111
Question 110: Which statement describes how the molecular structure of starch is suited to its function? A Amylose has a branched structure and amylopect…Question 111: Which comparative statements concerning biological molecules are correct? 1 A collagen molecule is a fibrous protein that contains many ami…Question 112: In triglyceride molecules, where are double bonds located? A between fatty acids and glycerol B within fatty acids and within glycerol C wi…Question 113: The diagram shows a triglyceride molecule that has been partially hydrolysed. H H C OH H C OH O H H H H H H H H H H C O C C C C C C C C C H…33 / 111
Question 114: Which shows α-glucose? A B CH2OH CH2OH H C O OH H C O H H H C C C C OH H OH H HO C C H HO C C OH H OH H OH C D H CH2OH H C O CH2OH HO C O O…Question 115: Which correctly matches the functional and structural features of cellulose, collagen, glycogen or triglyceride? structure molecule held …34 / 111
Question 116: Two disaccharides are maltose and sucrose. Maltose is formed from two molecules of glucose, whilst sucrose is formed from fructose and gluc…Question 117: The diagram shows a carbohydrate molecule. CH2OH C O OH HO O HO CH2OH CH2 CH2OH C O C O C O OH OH OH O O HO OH HO HO HO Of which polymers c…Question 118: Which type of sugar and types of bonds are found in a DNA molecule? type of sugar types of bonds A non-reducing hydrogen and ionic B non-re…35 / 111
Question 119: The diagram shows a section of a polysaccharide. C C C O C C C O O C C C C C C O C C C O C C C In which polysaccharide(s) could this sectio…Question 120: Chromatography is a technique used to separate molecules by their solubility. The diagram shows one apparatus used for this technique. abso…Question 121: In all lipid molecules, where are double bonds located? A between fatty acids and glycerol B within fatty acids and within glycerol C withi…36 / 111
Question 122: Which row shows the correct match between the descriptions of biological molecules and where they are found? 1 a linear polymer of 1,4 link…Question 123: Which is the correct description for the structure of amylose and cellulose? amylose cellulose A α-glucose β-glucose 180° rotation no rotat…Question 124: Which bonds hold together the structure of cellulose? 1 glycosidic 2 hydrogen 3 ionic A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 …37 / 111
Question 125: Which bonds are found in glycogen? 1-4, α bonds A B 1-4, β bonds 1-6, α bonds C DQuestion 126: Solutions of biological molecules are tested for sugars. The table shows the colours of the solutions after testing. boiled with hydrochlor…Question 127: Which molecule is α-glucose? A B C D CH2OH CH2OH CH2OH O O HOCH2 O CH2OH O OH OH H OH H H H H H OH H OH H H H OH OH OH H H H OH H OH OH H O…Question 128: Which diagram shows the bond linking the individual units of both glycogen and amylose? A B C D H C O P O C C N C C C O C C O C C O O38 / 111
Question 129: Which row describes a triglyceride? A v Jv B v x Cc x J D x x key ¥ = correct X = not correctQuestion 130: A solution containing equal masses of amylose and amylopectin is completely hydrolysed. Which molecules will be found after the hydrolysis?…Question 131: The colour of a positive Benedict’s test is due to the formation of copper oxide. The mass of copper oxide is proportional to the mass of r…Question 132: Which diagram shows the bond linking the individual units of both cellulose and glycogen? A B C D H C O P O C C N C C C O C C C O C O O39 / 111
Question 133: Which row describes a triglyceride? hydrophilic | S9UPS In A J J B J x c x J D x x key JY correct X not correctQuestion 134: The synthesis of biological molecules requires the formation of bonds. Which row is correct? a bond forms between a β-1,4 bond forms the h…Question 135: Which row describes a triglyceride? hydrophobic insoue in A v v key B v x ¥ correct Cc x v X not correct D x xQuestion 136: What may take place during a hydrolysis reaction? 1 a molecule of water is produced 2 a glycosidic bond is broken 3 a sucrose molecule is s…40 / 111
Question 137: The table shows some information about four carbohydrate polymers. a-1,4 a-1,6 0 shape of polymer | glycosidic glycosidic molecule bonds b…Question 138: Which molecule in the key is sucrose? is a reducing sugar yes no contains pentose sugar contains hexose sugar yes no yes no A B C DQuestion 139: Which statements about triglycerides and phospholipids are correct? 1 Triglycerides and phospholipids both have a hydrophobic region. 2 Tri…41 / 111
Question 140: X and Y are two monomers found in biological polymers. CH2OH CH2OH O O H OH H H H H OH H OH H HO H HO OH H OH H OH X Y Which monomer is fou…Question 141: Chitin is a polysaccharide consisting of long straight chains of the monosaccharide acetylglucosamine, linked by 1,4 glycosidic bonds. Acet…Question 142: Which statement about triglycerides is correct? A They are made up of three fatty acids combined with glycogen. B They are more saturated w…Question 143: Which row shows the monomer and type of bond that form the polymer? monomer type of bond polymer A α-glucose 1,4 only starch B α-glucose 1,…42 / 111
Question 144: The diagrams show four monosaccharides with the formula C6H12O6. Which diagram shows β-glucose? A B C D CH2OH CH2OH CH2OH CH2OH H O H H O O…Question 145: The diagram shows the relationship between different polysaccharides and the glycosidic bonds formed between the monomers. 1 2 3 4 5 Which …Question 146: When a small quantity of phospholipid is added to a test-tube of water and then shaken vigorously, an emulsion is formed by small droplets …Question 147: Which statements about fatty acids are correct? 1 form part of cell membranes 2 form storage droplets 3 are synthesised by the Golgi body A…43 / 111
Question 148: What cannot occur as a result of a condensation reaction? A breaking of a glycosidic bond B formation of a disaccharide C joining together …Question 149: Which pair of monosaccharides forms sucrose? CH2OH CH2OH H O H H O OH H H A OH H OH H OH OH OH H H OH H OH CH2OH CH2OH H O H H O H H H B OH…Question 150: The diagram shows the relationship between different polysaccharides and the glycosidic bonds formed between the monomers. 1 2 3 4 5 Which …44 / 111
Question 151: The diagrams show some of the types of bond in fatty acids. 1 2 3 O C C C C C C C OH Which row shows the bonds found in each type of molecu…Question 152: The diagram shows how the β-glucose units of cellulose are linked to each other. CH2OH H OH CH2OH H OH O O H H H H H O OH H H O OH H OH H H…Question 153: The table shows some information about carbohydrate polymers. Which row describes amylose? a-1,4 a-1,6 _ a shape of glycosidic | glyco…45 / 111
Question 154: Which row about α-glucose and β-glucose molecules is correct? carbon atom on which cellulose contains both the OH position is different mol…Question 155: What is the general formula for amylopectin? A (C5H10O5)n B (C5H10O6)n C (C6H12O6)n D (C6H10O5)nQuestion 156: Which statement describes how the molecular structure of starch is suited to its function? A Amylose has a branched structure and amylopect…Question 157: Cows and whales are mammals that produce milk to feed their babies. Newborn whales grow faster than newborn cows. The milk of both cows and…46 / 111
Question 158: The structure of phospholipids and triglycerides include the following. 1 glycerol linked to fatty acids 2 hydrophobic fatty acid chains 3 …Question 159: The diagrams show four monosaccharides with the formula C6H12O6. Which diagram shows α-glucose? A B C D CH2OH CH2OH CH2OH CH2OH H O OH H O …Question 160: Complete digestion of polysaccharides requires all the glycosidic bonds between the monomers to be broken. Amylase only breaks α-1,4 glycos…Question 161: Which diagram shows the monomer of cellulose? A B C D CH2OH CH2OH CH2OH CH2OH H O OH HO O H H O H H O OH H H H H OH H OH H OH H OH HO HO H …47 / 111
Question 162: Which statements about both amylose and amylopectin are correct? 1 They are polymers. 2 They are formed by hydrolysis reactions. 3 They are…Question 163: Which features adapt a cellulose molecule for its function? 1 Long chains of glucose molecules coil into a helix. 2 Many hydrogen bonds for…Question 164: Two disaccharides are maltose and sucrose. Maltose is formed from two molecules of glucose, whilst sucrose is formed from fructose and gluc…48 / 111
Question 165: The diagram shows the structure of the polysaccharide chitin which is found in the cell wall of fungi. CH3 C O CH2OH N H CH2OH H C O C C H …Question 166: Which row correctly matches the functional and structural features of cellulose, collagen, glycogen or triglyceride? structure molecules …49 / 111
Question 167: What are the features of triglycerides? lower proportion A Jv Jv x B Jv x J Cc x v x D x x J key J/ = yes X =noQuestion 168: A student carried out four tests for biological molecules on a sample of milk. The tests and their results were as follows. ● Heating to 80…Question 169: The diagrams show four monosaccharides with the formula C6H12O6. 1 2 3 4 CH2OH CH2OH CH2OH CH2OH H O H H O OH H O H H O H H H H H OH H OH H…Question 170: Which bonds will be broken when a molecule of glycogen is broken down? 1 α-1, 4 2 β-1, 4 3 α-1, 6 4 β-1, 6 A 1, 2 and 3 B 1 and 3 only C 2,…50 / 111
Question 171: The diagrams show four fatty acids, each with a chain of 18 carbon atoms. Which fatty acid, as part of a phospholipid molecule, would contr…Question 172: A student wrote these statements about polysaccharides. 1 Amylose is formed from condensation reactions between β-glucose monomers. 2 Branc…Question 173: Sugars with a ring structure can also have a linear structure. Which sugar molecules could be represented by the linear structure shown in …51 / 111
Question 174: When hydrolysed, which molecules have products containing a carboxyl group? 1 phospholipids 2 polysaccharides 3 proteins A 1 and 2 B 1 and …Question 175: What is the general formula for amylose? A (C5H10O5)n B (C5H10O6)n C (C6H10O5)n D (C6H12O6)nQuestion 176: The diagram shows relationships between some important molecules and bonds. 1 peptide glycosidic 3 ester 2 triglyceride cellulose vegetable…Question 177: In unsaturated lipid molecules, where are double bonds located? A between fatty acids and glycerol B within fatty acids and within glycerol…52 / 111
Question 178: Phospholipids and triglycerides are important biological molecules. Which properties are correct for these molecules? non-polar partially h…Question 179: The diagram shows part of a carbohydrate molecule formed by glucose. What is the name of the molecule? A amylose B cellulose C glycogen D s…Question 180: The diagram shows the relationship between some biological molecules. 1 2 3 4 5 Which row is correct? 1 2 3 4 5 A α-glucose carbohydrate su…53 / 111
Question 181: Which diagram shows the reaction that occurs to join two of the monomers that form cellulose? C C C C H C O H H C O H H C O H H C O H A C C…Question 182: Which molecules contain C=O bonds? 1 amino acids 2 fatty acids 3 glycerol A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 onlyQuestion 183: Solutions of three biological molecules are tested for sugars. The table shows the colours of the solutions after testing. boiled with hydr…54 / 111
Question 184: A solution containing equal masses of amylose and amylopectin is completely hydrolysed. Which molecules will be found after the hydrolysis?…Question 185: Which molecules contain the following bonds? ester hydrogen disulfide A amylase haemoglobin catalase B glycerol glycogen collagen C lipids …Question 186: Which feature of phospholipids enables a bilayer to form? A They are insoluble in water. B They are polar molecules. C They have hydrophobi…Question 187: A glycosidic bond is broken and two monosaccharides are formed during a positive test for a non-reducing sugar. Which row identifies the ca…Question 188: Which pair of statements are correct? A Carbon and oxygen occur in a ratio of 2 : 1 in carbohydrates. Triglycerides are soluble in water. B…55 / 111
Question 189: What is the general formula for cellulose? A (C5H10O5)n B (C5H10O6)n C (C6H10O5)n D (C6H12O6)nQuestion 190: A triglyceride consists of glycerol and three different fatty acids, linoleic acid (L), oleic acid (O) and palmitic acid (P). The diagram s…Question 191: A sample of a solution was tested for reducing sugar and the result was negative. Another sample of the same solution was then tested for n…Question 192: Which row correctly identifies three polysaccharides α-glucose α-glucose β-glucose straight chain branching chain straight chain A amylose …Question 193: Which row describes a triglyceride? hydrophobic nso in A Jv Jv key B v x ¥ = correct Cc x v X = not correct D x x56 / 111
Question 194: Which words correctly complete the description of amylose? The ««1«« amylose is a ««2«« made up of ««3«« of the ««4«« glucose. 1 2 3 4 A ma…Question 195: Which statements about glycosidic bonds are correct? 1 They occur by condensation reactions between the OH groups of two molecules. 2 They …Question 196: What is the general formula for glycogen? A (C5H10O5)n B (C5H10O6)n C (C6H10O5)n D (C6H12O6)nQuestion 197: Which statements are correct? 1 In a triglyceride molecule the bonds between the fatty acids and the glycerol molecule are called ester bon…57 / 111
Question 198: The diagram shows a molecule of three hexose sugars. CH2OH CH2OH CH2OH O C O C O H H H OH OH H H C C C C C C OH H OH H H OH HO OH HO H H CH…Question 199: Which feature of glycogen distinguishes glycogen from starch? A All glycogen molecules are highly branched. B All glycogen molecules are p…Question 200: A student wrote four statements about what happens during hydrolysis of a carbohydrate. 1 Disaccharides are formed from monosaccharides. 2 …58 / 111
Question 201: The table compares three molecules, X, Y and Z, which contain the elements carbon, hydrogen and oxygen only. The percentage of carbon, hydr…Question 202: Which statements about the differences between phospholipids and triglycerides are correct? 1 Phospholipids have hydrophobic regions but tr…Question 203: The diagram shows three hexose sugars. CH2OH CH2OH CH2OH O C O C O H H H OH OH H H C C C C C C OH H OH H H OH HO OH HO H H CH2OH C C C C C …59 / 111
Question 204: What can occur during condensation of carbohydrates? A a disaccharide is produced from monosaccharides B glycosidic bonds are broken C mole…Question 205: What is true about triglycerides? hydrophobic insoluble in alcohol A J Jv key B v x ¥ = correct Cc x v X = not correct D x xQuestion 206: After boiling a sample of milk with Benedict’s solution, a yellow colour is observed. Which conclusion about the sample of milk is correct?…Question 207: Which of the statements about polysaccharides can be used to describe amylose and cellulose? 1 contains 1,4 glycosidic bonds 2 contains 1,6…60 / 111
Question 208: The fatty acids elaidic acid and oleic acid have exactly the same structural formulae, with one double bond in the chain. However, the shap…Question 209: The diagram shows three hexose sugars. CH2OH CH2OH CH2OH O C O C O H H H OH OH H H C C C C C C OH H OH H H OH HO OH HO H H CH2OH C C C C C …61 / 111
Question 210: What can occur as a result of a condensation reaction? 1 A disaccharide is formed. 2 A glycosidic bond is broken. 3 A molecule of water is …Question 211: The diagram shows some relationships between features of carbohydrates. α-glucose 1,4 bonds 1 4 3 2 branched Which row correctly matches th…Question 212: Which row describes a triglyceride? v Jv key v Xx ¥ = correct x v X = not correct x x62 / 111
Question 213: The diagram shows three triglycerides, X, Y and Z. O H2COC O X HCOC O H2COC O H2COC O Y HCOC O H2COC O H2COC O Z HCOC O H2COC What is corre…63 / 111
Question 214: The diagram shows the monosaccharide xylose. H H C O OH H C H C OH HO C C H H OH Many xylose monomers can be joined by glycosidic bonds to …64 / 111
Question 215: Which molecules are monomers? 1 ribose 2 glucose 3 deoxyribose 4 sucrose A 1, 2 and 3 B 1, 2 and 4 C 1, 3 and 4 D 2, 3 and 4Question 216: Which molecules have properties that are dependent on hydrogen bonds? 1 cellulose 2 glycogen 3 haemoglobin 4 water A 1, 2 and 3 B 1, 2 and …Question 217: Some features of triglycerides are listed. 1 can be liquid or solid at room temperature 2 contains a high proportion of carbon–hydrogen bon…Question 218: Some foods contain hydrogenated vegetable oils. These are unsaturated fats that have been converted to saturated fats. Which property of th…Question 219: Which rows show the chemical groups present in the biological molecules listed? biological presence of carboxyl presence of two or more mol…65 / 111
Question 220: The diagram shows the formation of a biological macromolecule. O O OH C (CH2)16 CH3 CH2 O C (CH2)16 CH3 CH2 OH O O CH2 OH + → + 3H2O OH C (…Question 221: What occurs during the formation of a glycosidic bond between two α-glucose molecules? A a 1, 4 bond is always formed B a hydrogen bond is …Question 222: What is the maximum number of condensation reactions that occur when a triglyceride is synthesized? A 1 B 2 C 3 D 4Question 223: The molecule shown is a polymer of reducing sugars. CH2OH CH2OH CH2OH CH2OH O O O O OH OH OH OH O O O HO OH OH OH OH OH Which procedures co…66 / 111
Question 224: Which statement about biological molecules is correct? A Amylopectin, amylose and cellulose are all polymers. B Amylose, cellulose and gluc…Question 225: Sugars with a ring structure can also have a linear structure. H C O H C OH HO C H H C OH H C OH CH2OH Which of these sugar molecules could…Question 226: Which statements about phospholipids and triglycerides are correct? 1 They both contain ester bonds. 2 They both have three fatty acid chai…Question 227: Maltose and sucrose are disaccharides. Maltose is formed from two molecules of glucose, whilst sucrose is formed from fructose and glucose.…67 / 111
Question 228: The diagrams show short sections of some common polysaccharides and modified polysaccharides. CH2OH H NHCOCH3 CH2OH H OH O O H O H H O H H …Question 229: Which molecules contain at least two double bonds? 1 unsaturated fatty acid 2 collagen 3 haemoglobin A 1, 2 and 3 B 1 and 2 only C 1 and 3 …68 / 111
Question 230: The diagrams show three hexoses. CH2OH CH2OH O C O C O H H HOH2C OH H OH H H C C C C C C OH H H OH OH H HO OH H CH2OH HO H C C C C C C H OH…Question 231: The diagram shows part of the chemical structure of a naturally occurring polysaccharide. COOH CH2OH COOH CH2OH O O O O O O O O O O OH O OH…Question 232: What is the maximum number of water molecules produced when a triglyceride is synthesised? A 3 B 2 C 1 D 069 / 111
Question 233: The colour of a positive Benedict’s test is due to the formation of copper oxide. The mass of copper oxide is proportional to the mass of r…Question 234: Which polysaccharides contain 1, 4 and 1, 6 glycosidic bonds? 1 amylopectin 2 amylose 3 cellulose 4 glycogen A 1 and 3 B 1 and 4 C 2 and 3 …Question 235: Which molecules contain at least two double bonds? 1 saturated fatty acid 2 collagen 3 haemoglobin A 1, 2 and 3 B 1 and 2 only C 1 and 3 on…70 / 111
Question 236: A student carried out the Benedict’s test on two different types of milk, X and Y. A sample of each type of milk was heated to 100 C in a …Question 237: The diagram shows the structure of a monomer. CH2OH O H H H OH H HO OH H OH Which molecules contain this monomer? amylopectin A C B glycoge…71 / 111
Question 238: Which molecules are formed by condensation which involves a carboxyl group? A amylopectin, collagen, triglyceride, sucrose B amylopectin, c…Question 239: Which row correctly matches the function with the structural features of cellulose, collagen, glycogen or triglyceride? structure molecul…Question 240: Which row is correct for carbohydrates? monomer polymer macromolecule A fructose amylose cellulose B glucose deoxyribose amylopectin C mono…Question 241: Which molecules contain 1,6 glycosidic bonds? 1 amylopectin 2 glycogen 3 starch A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only72 / 111
Question 242: Which row correctly shows the ratio of carbon atoms to hydrogen atoms for glucose, a saturated fatty acid and sucrose? ratio of carbon atom…Question 243: Which row shows a correct comparison between a phospholipid molecule and a triglyceride molecule? phospholipid molecule triglyceride molecu…Question 244: Which diagram represents a molecule of -glucose? A B C D CH2OH CH2OH CH2OH CH2OH O O O OH HO O OH OH OH OH OH HO OH HO OH HO OH OH OH OHQuestion 245: Which statements about glycosidic bonds are correct? 1 Condensation between glucose and fructose uses water and forms sucrose. 2 Glycogen c…73 / 111
Question 246: A triglyceride has ......1...... bonds formed by joining fatty acids to ......2...... . Which row correctly completes this sentence? 1 2 A …Question 247: A sample of food was heated with Benedict’s solution which changed colour to green. A second sample of the same food was boiled with dilute…Question 248: Which pair of molecules only includes macromolecules that can be found in animal cells? A amylase and amylopectin B collagen and glycogen C…74 / 111
Question 249: Homogalacturonan is a polysaccharide found in plant cell walls. The diagram shows a molecule of the monomer used to form homogalacturonan. …Question 250: Which statement is correct for triglycerides and phospholipids? A A phosphate group is joined to a glycerol molecule. B Hydrocarbon chains …Question 251: Which row is correct for carbohydrates? macromolecule monomer polymer A sucrose starch -glucose B glycogen sucrose starch C -glucose glyc…Question 252: Which shows the correct general formula for glycogen? A (C5H10O5)n B (C5H10O6)n C (C6H10O5)n D (C6H12O6)n75 / 111
Question 253: Chitin is a structural polysaccharide found in the hard, outer shells of animals such as crabs. Chitin is made of chains of amino sugars th…Question 254: Four fatty acids and their formulae are listed. caprylic acid CH3(CH2)6COOH lauric acid CH3(CH2)10COOH oleic acid CH3(CH2)7CH=CH(CH2)7COOH …Question 255: Which molecule contains the smallest number of hydrogen atoms? A -glucose B glycine, an amino acid in which the R group is H C glycerol D …76 / 111
Question 256: Four solutions were tested for the presence of four different biological molecules. The appearance of the solutions after each test are sho…Question 257: The diagrams represent two monosaccharides with the same molecular formula (C6H12O6). Both can exist in an alpha () or beta () form as sh…77 / 111
Question 258: One type of covalent bond between two monomers is shown. CH2OH O H H H OH H ...O O CH2 H OH O H H H OH H ...O O... H OH Which molecules con…Question 259: Which statements about carbohydrates and triglycerides are correct? 1 They form polymers. 2 They contain carbon, hydrogen and oxygen. 3 The…Question 260: Which molecules contain at least three double bonds? A saturated fatty acid, collagen and haemoglobin B collagen and saturated fatty acid C…Question 261: One molecule of X is formed by a single condensation reaction releasing one molecule of water. What is molecule X? A a disaccharide B a pho…78 / 111
Question 262: The table shows some information about carbohydrate polymers. Which row describes glycogen? a-1,4 a-1,6 idi lvcosidic shape of function…Question 263: The diagrams show four phospholipid molecules. Which molecule could contribute most to the fluidity of a cell surface membrane? A B C DQuestion 264: Which general formula is correct for monosaccharides such as fructose? A (CHO)n B (CH2O)n C (CHO2)n D (C2HO)nQuestion 265: Which statements can be used to describe the structure of cellulose? 1 a polymer of glucose monomers linked by -1,4 glycosidic bonds 2 a p…Question 266: Complete hydrolysis of polysaccharides requires all the glycosidic bonds between the monomers to be broken. Enzyme X only breaks -1,4 glyc…79 / 111
Question 267: Which molecules contain at least two double bonds? A saturated fatty acid, collagen and haemoglobin B collagen and saturated fatty acid onl…Question 268: Which polysaccharide is correctly described? polysaccharide monomer biological role A amylopectin -glucose storage molecule in animals B a…Question 269: Which formula represents a saturated fatty acid? A C18H36O2 B C18H34O2 C C18H32O2 D C18H30O2Question 270: Which molecules always contain at least four double bonds? A triglyceride, collagen and haemoglobin B collagen and triglyceride only C haem…Question 271: A student used Benedict’s solution to test a sample known to contain carbohydrate. At the end of the test the solution was blue. Which carb…80 / 111
Question 272: Sugars with a ring structure can also have a linear structure. H C O H C OH HO C H H C OH H C OH CH2OH Which sugar molecules could be repre…Question 273: Which row matches each molecule to a type of bond that is present? ester bond hydrogen bond disulfide bond A amylase haemoglobin catalase B…Question 274: Which row shows features of a carbohydrate polymer found inside animal cells? a-1,4 a-1,6 shape of glycosidic glycosidic molecule bonds bo…Question 275: The statements describe the structure of a polysaccharide found in the cell walls of certain plants. 1 The polysaccharide is composed of tw…81 / 111
Question 276: The general formula for a saturated fatty acid is CnH2nO2. Which of these fatty acids are unsaturated? 1 C10H19COOH 2 C15H31COOH 3 C17H31CO…Question 277: What enables triglycerides to perform their functions in living organisms? 1 Triglycerides have hydrophobic and hydrophilic regions. 2 Trig…Question 278: Samples of glucose, sucrose, and a mixture of glucose and sucrose were divided into two halves M and N. M was then tested with Benedict’s s…82 / 111
Question 279: Which molecules contain 1,4-glycosidic bonds? amylose A D B C cellulose glycogenQuestion 280: The diagram shows three triglycerides, X, Y and Z. O H2COC O X HCOC O H2COC O H2COC O Y HCOC O H2COC O H2COC O Z HCOC O H2COC Which row is …83 / 111
Question 281: Some foods contain hydrogenated vegetable fats. These are unsaturated fats that have been converted to saturated fats. Which property of th…Question 282: Which statement is correct? A Amylase, ribose and phospholipid are all macromolecules. B Cellulose, glucose and catalase are all polymers. …Question 283: Four extracts from different plant materials were made and tested with Benedict’s solution. The extracts were boiled with Benedict’s soluti…Question 284: Which have properties that are dependent on hydrogen bonds? 1 cellulose 2 a molecule of haemoglobin 3 water A 1, 2 and 3 B 1 and 2 only C 1…84 / 111
Question 285: Which statement is correct? A Cellulose, glycogen and amylopectin are all polymers. B Ribose, amylase and phospholipid are all macromolecul…Question 286: Long chain, saturated fatty acids change from solid to liquid at higher temperatures compared with short chain, unsaturated fatty acids. Wh…Question 287: The diagram shows three hexose sugars. CH2OH CH2OH CH2OH O C O C O H H H OH OH H H C C C C C C OH H OH H H OH HO OH HO H H CH2OH C C C C C …Question 288: Trehalose is a sugar that gives a negative result when tested with Benedict’s solution. A molecule of trehalose forms two -glucose molecul…85 / 111
Question 289: Olestra is an artificial lipid. It is made by attaching fatty acids, by condensation, to a sucrose molecule. A simplified diagram of olestr…Question 290: Which diagram shows the ring form of β-glucose? A B CH2OH CH2OH H C O OH H C O H H H C C C C OH H OH H HO C C H HO C C OH H OH H OH C D CH2…Question 291: Which row correctly matches the example with the type of molecule? disaccharide macromolecule monomer polymer A fructose glycogen glucose s…86 / 111
Question 292: The enzyme α-amylase hydrolyses amylopectin but it is not able to hydrolyse some of its glycosidic bonds. ● It only hydrolyses 1,4 glycosid…Question 293: Molecule X is a lipid. H H O H H H H H H H H H H H C C C C C C C C HO C O C C C C C H H H H H H H H OH H H H H H molecule X Which row is co…87 / 111
Question 294: The diagrams show some biological molecules. Which biological molecule forms a polymer with a structural role in plants? A B CH2OH H C O H …Question 295: Which molecule is a disaccharide and a reducing sugar? A fructose B glucose C maltose D sucroseQuestion 296: The diagram shows bonding in part of a polysaccharide. CH2OH O H OH O X OH CH2OH CH2OH CH2 CH2OH O O O O H H H H OH OH OH OH O O O OH OH OH…88 / 111
Question 297: Which statements about triglycerides and phospholipids are correct? 1 Fatty acids in a triglyceride may be saturated or unsaturated but in …Question 298: Which diagram is correct for α-glucose? A B CH2OH OH C O C O H H H H H H C C C C OH H OH H HO OH HO OH C C C C H OH CH2OH OH C D OH CH2OH C…Question 299: Which reaction correctly represents one way sucrose can form? A (α-glucose – OH–) + (fructose – H+) → sucrose + H2O B (α-glucose …89 / 111
Question 300: The diagram represents part of an alginic acid molecule. Alginic acid is a polymer found in the cell walls of brown seaweeds. COOH H H O H …Question 301: Which features are correct for triglycerides and phospholipids? 1 They have ester bonds between glycerol and fatty acids. 2 Fatty acid chai…Question 302: Which statements are correct for amylose and also for amylopectin? 1 They are carbohydrate molecules. 2 They are formed by condensation rea…90 / 111
Question 303: Which statement is a correct comparison between saturated triglyceride molecules and unsaturated triglyceride molecules of approximately th…Question 304: Which molecules contain at least three double bonds? saturated triglyceride C A D collagen B haemoglobinQuestion 305: Which polymers are present in all viruses and all prokaryotes? 1 polynucleotides 2 polypeptides 3 polysaccharides A 1, 2 and 3 B 1 and 2 on…91 / 111
Question 306: A student was provided with a solution of carbohydrate. They removed two samples from the solution and performed tests on each sample, as s…Question 307: Which molecules contain at least two double bonds? sucrose C A D collagen haemoglobin B92 / 111
Question 308: What describes cellulose? A a branched chain of 1-4 α-glucose B a branched chain of 1-4 β-glucose C an unreactive linear chain of 1-4 α-glu…Question 309: Which polymers are present in all viruses, all prokaryotes and all eukaryotes? 1 polynucleotides 2 polypeptides 3 polysaccharides A 1, 2 an…Question 310: Which features contribute to the function of a cellulose molecule? 1 Long chains of glucose molecules coil into a helix. 2 Many hydrogen bo…Question 311: What correctly describes triglycerides? A non-polar molecules that are soluble in ethanol B non-polar molecules that are soluble in water C…93 / 111
Question 312: Cocoa butter contains three different triglycerides. These triglycerides are made from the fatty acids: • oleic acid (O) • palmitic acid (P…Question 313: Which molecules contain at least four double bonds? unsaturated triglyceride C A D haemoglobin collagen B94 / 111
Question 314: Which statements about amylopectin and glycogen are correct? 1 Amylopectin and glycogen contain 1-4 glycosidic bonds. 2 Amylopectin contain…Question 315: How many statements about fatty acids are correct?  Fatty acids are either saturated or unsaturated.  Fatty acids always have at least tw…Question 316: The diagram shows the structure of a monomer. CH2OH O H H H OH H HO OH H OH Which molecules contain this monomer? amylopectin A C B glycoge…Question 317: A triglyceride consists of glycerol and three different fatty acids: linoleic acid (L), oleic acid (O) and palmitic acid (P). The diagram s…95 / 111
Question 318: Which feature of cellulose molecules contributes to the function of plant cell walls? A Adjacent cellulose molecules are linked by glycosid…Question 319: Which diagrams show the release of a water molecule during the formation of a glycosidic bond? 1 2 CH2OH CH2OH CH2OH H O H H O H H O OH HO …Question 320: Which molecules have a structural formula that contains C=O bonds? 1 amino acids 2 fatty acids 3 glycerol 4 protein A 1, 2 and 3 B 1, 2 and…Question 321: Which statement about triglycerides is correct? A In any triglyceride, all the fatty acids are saturated or all the fatty acids are unsatur…96 / 111
Question 322: The diagram shows the structure of part of a peptidoglycan molecule. H CH2OH H O O H OH H H O H H O O O H CH2OH H3C CH C O NH HC CH3 CO NH …97 / 111
Question 323: The table shows the number of carbon atoms and the number of carbon–carbon double bonds in molecules of three triglycerides and the fatty a…Question 324: Which row is correct for cellulose? rotation of alternate monomers by 180° shape of molecule hydrogen bonds between molecules 0 0O WwW …Question 325: Which statements describe features of cellulose that adapt it for its function in plant cells? 1 Three cellulose molecules coil around each…98 / 111
Question 326: Which structure shows -glucose? A B CH2OH CH2OH C O C O H OH H H H H C C C C OH H OH H HO H HO OH C C C C H OH H OH C D H CH2OH C O C O H …Question 327: What cannot occur as a result of a condensation reaction? A breaking of a glycosidic bond B formation of a disaccharide C joining together …Question 328: A naturally occurring polysaccharide synthesised in a plant is a branched chain of -glucose. The straight parts of the molecule are linked…99 / 111
Question 329: The diagram shows a triglyceride. O H2COC O HCOC O H2COC An enzyme was used to digest this triglyceride into glycerol and fatty acids. Whic…100 / 111
Question 330: The diagram shows how the alternating nature of -glucose monomers along a chain allows hydrogen bonds to form between consecutive monomers…Question 331: Which feature of glycogen distinguishes it from starch? A All glycogen molecules are highly branched. B All glycogen molecules are polysacc…101 / 111
Question 332: The diagram shows a biological molecule. H H H H H H O H H H H H H C C C C C C H H C O C C C C C C H H H H H H H H H H H H H H H H H H O H …Question 333: A mixture of glucose and starch solutions was placed in a length of dialysis (Visking) tubing and the tubing sealed. The tubing was then pl…102 / 111
Question 334: Phospholipids are formed in a similar way to triglycerides. A sample contained six phospholipid molecules. ● The molecular weight of a phos…Question 335: The diagram shows a triglyceride. O H H H H H H H H H H C C C C C C C C C C H H C O H H H H H H H H H O H H H H H H H H H C C C C C C C C C…Question 336: Which row is correct for parts of a phospholipid molecule? can be saturated can also be found or unsaturated in a triglyceride A head tail …103 / 111
Question 337: What could take place during a hydrolysis reaction? 1 A glycosidic bond is broken. 2 A molecule of water is produced. 3 A sucrose molecule …Question 338: Sugars with a ring structure can also have a linear structure. Which sugar molecules could be represented by the linear structure shown in …Question 339: Which statement about triglycerides is correct? A Each triglyceride molecule is formed by combining three fatty acid molecules with a glyco…Question 340: Plant cell walls are strengthened by cellulose molecules that are arranged in several layers. Within each layer, the cellulose molecules ar…104 / 111
Question 341: Galactogen is a storage polysaccharide in some animal species. It is a branched polymer that is formed from -galactose monomers. Which com…Question 342: A sample of a solution of sucrose tested for reducing sugars remains blue, but when another sample of the same solution is tested for non-r…Question 343: Which molecules contain at least two double bonds? saturated triglyceride C A D collagen haemoglobin B105 / 111
Question 344: Amylose, amylopectin and glycogen are all polysaccharides. Enzyme X removes one maltose molecule at a time from the ends of a polysaccharid…Question 345: Cell membranes become less fluid as the temperature decreases. Bacteria and yeast cannot regulate their cell temperatures. How do bacteria …Question 346: Which statement about a macromolecule is correct? A Amylose is a branched polymer made of -glucose and -glucose monomers. B DNA is an ass…Question 347: What happens to molecules of sucrose when they are heated with acid? A Glycosidic bonds are broken by condensation using water, releasing o…106 / 111
Question 348: The diagrams show how some polymers of glucose can be classified. polymer function R starch P P Q amylose Q Which row correctly identifies …Question 349: Which molecules have products containing a carboxyl group when they are hydrolysed? 1 phospholipids 2 polysaccharides 3 proteins A 1 and 2 …Question 350: Which molecule is required for this reaction to occur? C12H22O11 + H2O  C6H12O6 + C6H12O6 A catalase B copper sulfate C hydrochloric…107 / 111
Question 351: Which molecules contain at least two double bonds? unsaturated fatty acid C A D collagen haemoglobin BQuestion 352: Solution X was tested for the presence of non-reducing sugars. It did not contain reducing sugars. Some steps that can be used to test for …108 / 111
Question 353: The diagram shows the structure of part of a biological molecule. HOH2C O O CH2 O HO CH2OH OH OH OH OH HOH2C O O HO CH2 OH HOH2C O O CH2 O …Question 354: Which diagram has a covalent bond that joins monomers together to form a biological polymer in eukaryotes? A B C D O R H O R O R R NH3 + –O…109 / 111
Question 355: Which feature of storage polysaccharides means they do not change the water potential of cells? A They are easily hydrolysed. B They are co…Question 356: Which molecules contain at least four double bonds? saturated triglyceride C A D collagen haemoglobin BQuestion 357: The diagram shows some steps in a laboratory method used to identify the presence of non-reducing sugars in a food sample. Some terms are m…Question 358: Many biological molecules exist as polymers made up of monomer subunits. Which row correctly identifies the monomer in each of the biologic…110 / 111
Question 359: Which statement correctly explains the result when the two molecules shown in the diagram react together? CH2OH CH2OH H C O H H C O H H H C…Question 360: Which row describes amylopectin? a-1,4 a-1,6 idi idi shape of function of glycosidic gIYCOSICIC molecule molecule bonds bonds A Jv v bra…Question 361: What is a feature of triglyceride molecules? A They are hydrophobic molecules. B They are molecules with a single ester bond. C They are po…Question 362: An unsaturated fatty acid molecule has 17 carbon atoms in the tail which is attached to its carboxyl group. The tail contains three double …Question 363: Which statement about phospholipids in the bilayer of a cell surface membrane is correct? A The non-polar phosphate heads face outwards and…111 / 111

Mark scheme363 answers

Answers below. Sit the paper first if you are practising.

Pastlit

Biology 9700 · Carbohydrates and lipids — Paper 1

A Level · topical answer key — answer key (teacher use)

Question

Answer

Marks

1A1
2C1
3C1
4A1
5B1
6B1
7A1
8B1
9B1
10C1
11D1
12B1
13B1
14D1
15B1
16B1
17C1
18A1
19B1
20B1
21D1
22A1
23B1
24C1
25A1
26D1
27C1
28B1
29C1
30A1
31D1
32B1
33C1
34D1
35C1
36C1
37B1
38A1
39B1
40A1
41B1
42A1
43B1
44B1
45D1
46A1
47B1
48A1
49B1
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Biology 9700 · Carbohydrates and lipids — Paper 1

A Level · topical answer key — answer key (teacher use)

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Answer

Marks

50A1
51A1
52D1
53D1
54A1
55C1
56A1
57A1
58C1
59A1
60B1
61D1
62B1
63B1
64A1
65C1
66A1
67A1
68D1
69C1
70D1
71A1
72B1
73B1
74B1
75B1
76D1
77D1
78B1
79A1
80D1
81A1
82D1
83C1
84C1
85B1
86B1
87A1
88C1
89B1
90A1
91C1
92A1
93B1
94C1
95A1
96D1
97A1
98C1
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Biology 9700 · Carbohydrates and lipids — Paper 1

A Level · topical answer key — answer key (teacher use)

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Marks

99C1
100A1
101B1
102C1
103C1
104C1
105B1
106C1
107D1
108C1
109C1
110D1
111C1
112C1
113B1
114B1
115A1
116A1
117D1
118C1
119B1
120D1
121C1
122B1
123B1
124B1
125B1
126C1
127D1
128C1
129D1
130A1
131B1
132D1
133C1
134B1
135B1
136D1
137B1
138C1
139A1
140B1
141C1
142D1
143B1
144—1
145—1
146—1
147—1
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Biology 9700 · Carbohydrates and lipids — Paper 1

A Level · topical answer key — answer key (teacher use)

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Answer

Marks

148A1
149C1
150D1
151A1
152D1
153B1
154A1
155D1
156D1
157D1
158D1
159B1
160B1
161A1
162C1
163C1
164A1
165B1
166A1
167C1
168C1
169A1
170B1
171D1
172D1
173B1
174B1
175C1
176A1
177C1
178C1
179C1
180C1
181D1
182B1
183D1
184A1
185D1
186C1
187B1
188B1
189C1
190A1
191C1
192A1
193B1
194D1
195B1
196C1
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Biology 9700 · Carbohydrates and lipids — Paper 1

A Level · topical answer key — answer key (teacher use)

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Marks

197C1
198D1
199A1
200C1
201B1
202D1
203D1
204A1
205B1
206B1
207B1
208C1
209D1
210C1
211B1
212D1
213A1
214D1
215A1
216C1
217D1
218A1
219B1
220A1
221C1
222C1
223C1
224A1
225C1
226B1
227A1
228B1
229A1
230C1
231C1
232A1
233B1
234B1
235D1
236C1
237B1
238D1
239A1
240A1
241A1
242A1
243C1
244A1
245C1
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Biology 9700 · Carbohydrates and lipids — Paper 1

A Level · topical answer key — answer key (teacher use)

Question

Answer

Marks

246C1
247C1
248B1
249A1
250B1
251D1
252C1
253C1
254A1
255B1
256B1
257D1
258C1
259D1
260C1
261A1
262A1
263D1
264B1
265A1
266A1
267C1
268B1
269A1
270C1
271D1
272D1
273D1
274A1
275D1
276C1
277D1
278C1
279C1
280A1
281A1
282C1
283D1
284A1
285A1
286D1
287D1
288B1
289C1
290A1
291D1
292C1
293C1
294D1
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Biology 9700 · Carbohydrates and lipids — Paper 1

A Level · topical answer key — answer key (teacher use)

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Answer

Marks

295C1
296B1
297C1
298A1
299A1
300B1
301A1
302B1
303A1
304D1
305B1
306B1
307B1
308D1
309B1
310C1
311A1
312C1
313D1
314B1
315C1
316B1
317A1
318D1
319A1
320B1
321D1
322D1
323D1
324D1
325D1
326B1
327A1
328A1
329B1
330A1
331A1
332C1
333B1
334B1
335B1
336D1
337C1
338B1
339D1
340C1
341D1
342A1
343D1
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Pastlit

Biology 9700 · Carbohydrates and lipids — Paper 1

A Level · topical answer key — answer key (teacher use)

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Another paper, or another topic

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All of Biological molecules →

Questions as text

Q1 · Food tests are carried out on four solutions 9700/11 Oct/Nov 2004

7 Food tests are carried out on four solutions. Which solution contains only sucrose and protein? Benedict’s acid hydrolysis iodine in biuret solution test then potassium test Benedict's test iodide solution A Xx v x v B Jv v Xx v Cc Xx v v x D Jv Xx v x key ¥ = positive result X = negative result

1 marks

Answer: A

This question in 9700/11 Oct/Nov 2004

Q2 · During the production of apple juice, enzymes are used to break down the components of… 9700/11 Oct/Nov 2004

8 During the production of apple juice, enzymes are used to break down the components of the cell walls. Which carbohydrate will be produced by this hydrolysis? A amylose B cellulose C glucose D glycogen

1 marks

Answer: C

This question in 9700/11 Oct/Nov 2004

Q3 · What are the features of glycogen? 9700/11 Oct/Nov 2004

9 What are the features of glycogen? . . branched structural role in contains nitrogen molecule cell A Jv Jv x B Jv x Jv Cc x J x D x x Jv

1 marks

Answer: C

This question in 9700/11 Oct/Nov 2004

Q4 · What is the name of the bond joining glycerol and a fatty acid in the formation of a… 9700/11 Oct/Nov 2004

10 What is the name of the bond joining glycerol and a fatty acid in the formation of a monoglyceride? A ester B glycosidic C hydrogen D peptide

1 marks

Answer: A

This question in 9700/11 Oct/Nov 2004

Q5 · Which part of a phospholipid molecule makes up most of the thickness of a cell surface… 9700/11 Oct/Nov 2004

16 Which part of a phospholipid molecule makes up most of the thickness of a cell surface membrane? A glycerol B hydrocarbon chains C hydrophilic head D phosphate group

1 marks

Answer: B

This question in 9700/11 Oct/Nov 2004

Q6 · Which type of reaction takes place when starch molecules are converted into reducing… 9700/11 May/June 2006

7 Which type of reaction takes place when starch molecules are converted into reducing sugars? A condensation B hydrolysis C polymerisation D synthesis

1 marks

Answer: B

This question in 9700/11 May/June 2006

Q7 · The diagrams show different types of bond found in polysaccharides 9700/11 May/June 2006

9 The diagrams show different types of bond found in polysaccharides. 1 3 O O O O O O 2 O O O Which type or types of bond are found in amylose? A 1 only B 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: A

This question in 9700/11 May/June 2006

Q8 · Which statement is true for cellulose, but not true for protein? 9700/11 Oct/Nov 2006

6 Which statement is true for cellulose, but not true for protein? A It is found in cell surface membranes. B It is synthesised from identical sub-units. C It is used as an energy source. D It may be a structural component.

1 marks

Answer: B

This question in 9700/11 Oct/Nov 2006

Q9 · Heating with which solution breaks glycosidic bonds? 9700/11 Oct/Nov 2006

7 Heating with which solution breaks glycosidic bonds? A Benedict’s solution B dilute hydrochloric acid C dilute sodium hydroxide D ethanol

1 marks

Answer: B

This question in 9700/11 Oct/Nov 2006

Q10 · Which of the following is a polysaccharide present in human muscle? 9700/11 Oct/Nov 2007

9 Which of the following is a polysaccharide present in human muscle? A amylose B collagen C glycogen D haemoglobin

1 marks

Answer: C

This question in 9700/11 Oct/Nov 2007

Q11 · The diagrams show four different molecules 9700/11 Oct/Nov 2007

12 The diagrams show four different molecules. P Q CH2OH CH2OH C O H O H H N C C H C C H OH OH H H HO OH C C H OH R S CH2OH O OH C O C H OH H CH2 C C OH H H HO H O C C N C C H OH H OH H Which shows the correct information about the molecule or molecules? contains a forms 1,6 glycosidic forms peptide bonds carboxyl group bonds in glycogen by condensation A P P P and Q B Q R P and R C R R R and Q D S P Q and S

1 marks

Answer: D

This question in 9700/11 Oct/Nov 2007

Q12 · Samples of a food were tested using Benedict’s reagent, biuret solution and ethanol 9700/11 May/June 2008

6 Samples of a food were tested using Benedict’s reagent, biuret solution and ethanol. After testing, the solutions were blue with Benedict’s reagent, purple with biuret and cloudy with ethanol. Which molecules do the samples contain? W X H CH2OH OH HO CH2 C C C O H H H O H N C C OH H OH OH CH3 CH2 C C H C C H O N H OH CH3 C C H O N H H Y Z HOCH2 H O H HOCH2 O O H H C O C R H H 1 2 O HO OH H O H HO CH2OH H C O C R H OH OH H O H C O C R H A W, X and Z B W, Y and Z C W, X and Y D X, Y and Z

1 marks

Answer: B

This question in 9700/11 May/June 2008

Q13 · The diagram shows an α 1 : 4 glycosidic bond 9700/11 May/June 2008

8 The diagram shows an α 1 : 4 glycosidic bond. CH2OH CH2OH H H H O O H H H OH H O OH H OH OH H OH H OH Which molecules contain this bond? A amylose and cellulose B amylose but not cellulose C cellulose but not amylose D neither amylose nor cellulose

1 marks

Answer: B

This question in 9700/11 May/June 2008

Q14 · Which combination describes a triglyceride? 9700/11 May/June 2008

9 Which combination describes a triglyceride? hydrophilic soluble in alcohol A v v B x x Cc v x D x v

1 marks

Answer: D

This question in 9700/11 May/June 2008

Q15 · When hydrolysed, which molecules have products containing a carboxyl group? 9700/11 May/June 2008

11 When hydrolysed, which molecules have products containing a carboxyl group? 1 phospholipids 2 polysaccharides 3 proteins A 1 and 2 B 1 and 3 C 2 and 3 D 3 only

1 marks

Answer: B

This question in 9700/11 May/June 2008

Q16 · Which diagram shows part of a structural polysaccharide? 9700/11 Oct/Nov 2008

6 Which diagram shows part of a structural polysaccharide? O O O O A … O O O O O … O O O O B … O O O O O … O O C … O O O O O O O … O O D O

1 marks

Answer: B

This question in 9700/11 Oct/Nov 2008

Q17 · Sucrose is a disaccharide formed from two hexose sugars, α-glucose (alpha-glucose) and… 9700/11 Oct/Nov 2008

8 Sucrose is a disaccharide formed from two hexose sugars, α-glucose (alpha-glucose) and fructose. Which pair of monosaccharide structures will be formed when sucrose is hydrolysed? CH2OH CH2OH H O H H O OH H H A OH H OH H OH OH OH H H OH H OH CH2OH CH2OH H O H H O H H H B OH H OH H OH OH OH OH H OH H OH CH2OH HOCH2 O CH2OH H O H H H OH C OH H H OH OH OH OH H H OH CH2OH HOCH2 O CH2OH H O OH H H OH D OH H H OH OH H OH H H OH

1 marks

Answer: C

This question in 9700/11 Oct/Nov 2008

Q18 · Which type of molecule contains disulphide bonds and which contains glycosidic bonds? 9700/11 Oct/Nov 2008

11 Which type of molecule contains disulphide bonds and which contains glycosidic bonds? disulphide bonds glycosidic bonds A glycoprotein polysaccharide B nucleic acid glycoprotein C polysaccharide nucleic acid D protein triglyceride

1 marks

Answer: A

This question in 9700/11 Oct/Nov 2008

Q19 · Which statement is true for cellulose, but not true for protein? 9700/12 Oct/Nov 2009

8 Which statement is true for cellulose, but not true for protein? A It is found in cell surface membranes. B It is synthesised from identical sub-units. C It is used as an energy source. D It may be a structural component.

1 marks

Answer: B

This question in 9700/12 Oct/Nov 2009

Q20 · The diagram shows a triglyceride molecule that has been partially hydrolysed 9700/12 Oct/Nov 2009

9 The diagram shows a triglyceride molecule that has been partially hydrolysed. H H C OH H C OH O H H H H H H H H H H C O C C C C C C C C C H C H C H H H H H H H H H C H H C H H C H H C H H C H H C H C H H H What will be the products of the total hydrolysis of the molecule shown? A a molecule of glycerol and a saturated fatty acid molecule only B a molecule of glycerol and an unsaturated fatty acid molecule only C a molecule of water, a molecule of glycerol and a saturated fatty acid molecule D a molecule of water, a molecule of glycerol and an unsaturated fatty acid molecule

1 marks

Answer: B

This question in 9700/12 Oct/Nov 2009

Q21 · Which statement describes how the molecular structure of starch is suited to its function? 9700/11 May/June 2010

8 Which statement describes how the molecular structure of starch is suited to its function? A Amylose has a branched structure and amylopectin is coiled to give a compact molecule for transport. B In the breakdown of amylose and amylopectin, many hydrolysis reactions release stored energy. C In the formation of amylose and amylopectin, many condensation reactions allow the release of stored energy. D The final amylose / amylopectin complex is insoluble and does not affect the osmotic properties of the cell.

1 marks

Answer: D

This question in 9700/11 May/June 2010

Q22 · Which diagram represents part of the ring form of a molecule of β-glucose? 9700/11 May/June 2010

9 Which diagram represents part of the ring form of a molecule of β-glucose? A B C D H O O OH H O O H HO O O O H HO O O O OH HO H HO OH H OH H H

1 marks

Answer: A

This question in 9700/11 May/June 2010

Q23 · How many fatty acid residues are normally present in a phospholipid molecule? 9700/11 May/June 2010

10 How many fatty acid residues are normally present in a phospholipid molecule? A 1 B 2 C 3 D 4

1 marks

Answer: B

This question in 9700/11 May/June 2010

Q24 · Which feature distinguishes starch from glycogen? 9700/11 May/June 2010

12 Which feature distinguishes starch from glycogen? A Starch contains α-glucose. B Starch contains 1,6 glycosidic bonds. C Starch has an unbranched component. D Starch is a polysaccharide.

1 marks

Answer: C

This question in 9700/11 May/June 2010

Q25 · Which diagram represents part of the ring form of a molecule of β-glucose? 9700/12 May/June 2010

27 Which diagram represents part of the ring form of a molecule of β-glucose? A B C D H O O OH H O O H HO O O O H HO O O O OH HO H HO OH H OH H H

1 marks

Answer: A

This question in 9700/12 May/June 2010

Q26 · Which statement describes how the molecular structure of starch is suited to its function? 9700/12 May/June 2010

28 Which statement describes how the molecular structure of starch is suited to its function? A Amylose has a branched structure and amylopectin is coiled to give a compact molecule for transport. B In the breakdown of amylose and amylopectin, many hydrolysis reactions release stored energy. C In the formation of amylose and amylopectin, many condensation reactions allow the release of stored energy. D The final amylose / amylopectin complex is insoluble and does not affect the osmotic properties of the cell.

1 marks

Answer: D

This question in 9700/12 May/June 2010

Q27 · Which feature distinguishes starch from glycogen? 9700/12 May/June 2010

29 Which feature distinguishes starch from glycogen? A Starch contains α-glucose. B Starch contains 1,6 glycosidic bonds. C Starch has an unbranched component. D Starch is a polysaccharide.

1 marks

Answer: C

This question in 9700/12 May/June 2010

Q28 · How many fatty acid residues are normally present in a phospholipid molecule? 9700/12 May/June 2010

30 How many fatty acid residues are normally present in a phospholipid molecule? A 1 B 2 C 3 D 4

1 marks

Answer: B

This question in 9700/12 May/June 2010

Q29 · Which feature distinguishes starch from glycogen? 9700/13 May/June 2010

3 Which feature distinguishes starch from glycogen? A Starch contains α-glucose. B Starch contains 1,6 glycosidic bonds. C Starch has an unbranched component. D Starch is a polysaccharide.

1 marks

Answer: C

This question in 9700/13 May/June 2010

Q30 · Which diagram represents part of the ring form of a molecule of β-glucose? 9700/13 May/June 2010

4 Which diagram represents part of the ring form of a molecule of β-glucose? A B C D H O O OH H O O H HO O O O H HO O O O OH HO H HO OH H OH H H

1 marks

Answer: A

This question in 9700/13 May/June 2010

Q31 · Which statement describes how the molecular structure of starch is suited to its function? 9700/13 May/June 2010

19 Which statement describes how the molecular structure of starch is suited to its function? A Amylose has a branched structure and amylopectin is coiled to give a compact molecule for transport. B In the breakdown of amylose and amylopectin, many hydrolysis reactions release stored energy. C In the formation of amylose and amylopectin, many condensation reactions allow the release of stored energy. D The final amylose / amylopectin complex is insoluble and does not affect the osmotic properties of the cell.

1 marks

Answer: D

This question in 9700/13 May/June 2010

Q32 · How many fatty acid residues are normally present in a phospholipid molecule? 9700/13 May/June 2010

20 How many fatty acid residues are normally present in a phospholipid molecule? A 1 B 2 C 3 D 4

1 marks

Answer: B

This question in 9700/13 May/June 2010

Q33 · What are the features of triglycerides? 9700/11 Oct/Nov 2010

7 What are the features of triglycerides? 0 0O DW > polar x x KOK less dense than water ~ Kw OK higher energy value than carbohydrates x << & x lower proportion of hydrogen than in carbohydrates K & & x key v/=yes xX =no

1 marks

Answer: C

This question in 9700/11 Oct/Nov 2010

Q34 · Which linkages are found between the glucose units in cellulose? 9700/11 Oct/Nov 2010

9 Which linkages are found between the glucose units in cellulose? A α 1–4 only B α 1–4 and α 1–6 C β 1–4 and α 1–6 D β 1–4 only

1 marks

Answer: D

This question in 9700/11 Oct/Nov 2010

Q35 · Which diagram shows the bond linking the individual units of both cellulose and amylose? 9700/11 Oct/Nov 2010

11 Which diagram shows the bond linking the individual units of both cellulose and amylose? A B C D H C O P O C C N C C C O C C O C C O O

1 marks

Answer: C

This question in 9700/11 Oct/Nov 2010

Q36 · Which statements about amylopectin and glycogen are correct? 9700/11 Oct/Nov 2010

12 Which statements about amylopectin and glycogen are correct? 1 both contain 1-4 glycosidic bonds 2 amylopectin contains β-glucose 3 glycogen contains more 1-6 branches than amylopectin A 1 only B 1 and 2 C 1 and 3 D 2 and 3

1 marks

Answer: C

This question in 9700/11 Oct/Nov 2010

Q37 · The diagram shows part of a carbohydrate molecule 9700/12 Oct/Nov 2010

6 The diagram shows part of a carbohydrate molecule. CH2OH C O OH HO O HO CH2OH CH2 CH2OH C O C O C O OH OH OH O O HO OH HO HO HO If all the 1, 4 glycosidic bonds in this molecule are hydrolysed, how many water molecules will be used and how many separate glucose molecules will be produced? number of water number of glucose molecules used molecules produced A 1 1 B 2 2 C 3 3 D 4 4

1 marks

Answer: B

This question in 9700/12 Oct/Nov 2010

Q38 · Four different fruit juices, A, B, C and D, were tested with Benedict’s solution 9700/11 May/June 2011

6 Four different fruit juices, A, B, C and D, were tested with Benedict’s solution. A second sample of each juice was hydrolysed and tested with Benedict’s solution. The table shows the masses of the precipitates formed. Which juice contains the greatest mass of non-reducing sugar? mass of precipitate mass of precipitate before hydrolysis after hydrolysis / mg / mg A 30 55 B 55 55 C 65 85 D 70 80

1 marks

Answer: A

This question in 9700/11 May/June 2011

Q39 · Which molecular bonds will be broken by hydrolysis when a molecule of glycogen is… 9700/11 May/June 2011

7 Which molecular bonds will be broken by hydrolysis when a molecule of glycogen is converted to glucose? bonds 1,2 1,4 1,6 A v x x key B x v v ¥ = broken Cc v x v X = unbroken D x v x

1 marks

Answer: B

This question in 9700/11 May/June 2011

Q40 · Some foods contain ‘hydrogenated vegetable oils’ 9700/11 May/June 2011

9 Some foods contain ‘hydrogenated vegetable oils’. These are unsaturated fats that have been converted to saturated fats. Which property of the fats will have changed? A Their hydrocarbon chains will fit together more closely. B Their solubility in water will increase. C They will have more double bonds in their molecules. D They will remain liquid at room temperature.

1 marks

Answer: A

This question in 9700/11 May/June 2011

Q41 · Which rows show the chemical groups present in the biological molecules listed? 9700/11 May/June 2011

10 Which rows show the chemical groups present in the biological molecules listed? biological presence of carboxyl presence of two or more molecule (COOH) groups hydroxyl (OH) groups 1 amino acid yes no 2 β-glucose no yes 3 glycerol no no 4 fatty acid yes no A 1, 2 and 3 B 1, 2 and 4 C 1, 3 and 4 D 2, 3 and 4

1 marks

Answer: B

This question in 9700/11 May/June 2011

Q42 · Which correctly matches the functional and structural features of cellulose, collagen… 9700/11 May/June 2011

11 Which correctly matches the functional and structural features of cellulose, collagen, glycogen or triglyceride? structure molecule held function fibrous together by branched chains hydrogen bonds A cellulose support Jv Jv x triglyceride | energy source x x x B collagen strengthening Jv Jv x cellulose support v x v Cc collagen strengthening Jv Jv Jv glycogen storage x x v D glycogen storage x Jv Jv triglyceride | energy source x Jv x key /=true xX =false

1 marks

Answer: A

This question in 9700/11 May/June 2011

Q43 · Which polysaccharides are branched and which are unbranched? 9700/12 May/June 2011

6 Which polysaccharides are branched and which are unbranched? branched unbranched A amylose cellulose B amylopectin cellulose C cellulose amylose D cellulose amylopectin

1 marks

Answer: B

This question in 9700/12 May/June 2011

Q44 · Three carbohydrate molecules are shown 9700/12 May/June 2011

7 Three carbohydrate molecules are shown. CH2OH CH2OH CH2OH O O O OH OH OH OH OH CH2OH HO OH HO OH OH OH 1 2 3 Which two molecules combine to form a molecule of sucrose? A 1 and 2 B 1 and 3 C 2 and 3 D two of molecule 1

1 marks

Answer: B

This question in 9700/12 May/June 2011

Q45 · Which row describes a triglyceride? 9700/12 May/June 2011

11. Which row describes a triglyceride? A v Jv B v x Cc x J D x x key ¥ = correct X = incorrect

1 marks

Answer: D

This question in 9700/12 May/June 2011

Q46 · Four different fruit juices, A, B, C and D, were tested with Benedict’s solution 9700/13 May/June 2011

31 Four different fruit juices, A, B, C and D, were tested with Benedict’s solution. A second sample of each juice was hydrolysed and tested with Benedict’s solution. The table shows the masses of the precipitates formed. Which juice contains the greatest mass of non-reducing sugar? mass of precipitate mass of precipitate before hydrolysis after hydrolysis / mg / mg A 30 55 B 55 55 C 65 85 D 70 80

1 marks

Answer: A

This question in 9700/13 May/June 2011

Q47 · Which rows show the chemical groups present in the biological molecules listed? 9700/13 May/June 2011

32 Which rows show the chemical groups present in the biological molecules listed? biological presence of carboxyl presence of two or more molecule (COOH) groups hydroxyl (OH) groups 1 amino acid yes no 2 β-glucose no yes 3 glycerol no no 4 fatty acid yes no A 1, 2 and 3 B 1, 2 and 4 C 1, 3 and 4 D 2, 3 and 4

1 marks

Answer: B

This question in 9700/13 May/June 2011

Q48 · Some foods contain ‘hydrogenated vegetable oils’ 9700/13 May/June 2011

33 Some foods contain ‘hydrogenated vegetable oils’. These are unsaturated fats that have been converted to saturated fats. Which property of the fats will have changed? A Their hydrocarbon chains will fit together more closely. B Their solubility in water will increase. C They will have more double bonds in their molecules. D They will remain liquid at room temperature.

1 marks

Answer: A

This question in 9700/13 May/June 2011

Q49 · Which molecular bonds will be broken by hydrolysis when a molecule of glycogen is… 9700/13 May/June 2011

34 Which molecular bonds will be broken by hydrolysis when a molecule of glycogen is converted to glucose? bonds 1,2 1,4 1,6 A v x x key B x v v ¥ = broken Cc v x v X = unbroken D x v x

1 marks

Answer: B

This question in 9700/13 May/June 2011

Q50 · Which correctly matches the functional and structural features of cellulose, collagen… 9700/13 May/June 2011

35 Which correctly matches the functional and structural features of cellulose, collagen, glycogen or triglyceride? structure molecule held function fibrous together by branched chains hydrogen bonds A cellulose support J Jv x triglyceride | energy source x x x B collagen strengthening Jv Jv x cellulose support Jv x J Cc collagen strengthening Jv Jv Jv glycogen storage x x v D glycogen storage x Jv Jv triglyceride | energy source x Jv x key /=true xX = false

1 marks

Answer: A

This question in 9700/13 May/June 2011

Q51 · Two disaccharides are maltose and sucrose 9700/11 Oct/Nov 2011

8 Two disaccharides are maltose and sucrose. Maltose is formed from two molecules of glucose, whilst sucrose is formed from fructose and glucose. Which row shows the molecular formulae of the two disaccharides? maltose sucrose A C12H22O11 C12H22O11 B C12H22O11 C12H24O12 C C12H24O12 C12H22O11 D C12H24O12 C12H24O12

1 marks

Answer: A

This question in 9700/11 Oct/Nov 2011

Q52 · The diagram shows a carbohydrate molecule 9700/11 Oct/Nov 2011

9 The diagram shows a carbohydrate molecule. CH2OH C O OH HO O HO CH2OH CH2 CH2OH C O C O C O OH OH OH O O HO OH HO HO HO Of which polymers could this be a part? A amylopectin and cellulose B amylose and starch C glycogen and amylose D starch and glycogen

1 marks

Answer: D

This question in 9700/11 Oct/Nov 2011

Q53 · The diagram shows a carbohydrate molecule 9700/13 Oct/Nov 2011

18 The diagram shows a carbohydrate molecule. CH2OH C O OH HO O HO CH2OH CH2 CH2OH C O C O C O OH OH OH O O HO OH HO HO HO Of which polymers could this be a part? A amylopectin and cellulose B amylose and starch C glycogen and amylose D starch and glycogen

1 marks

Answer: D

This question in 9700/13 Oct/Nov 2011

Q54 · Two disaccharides are maltose and sucrose 9700/13 Oct/Nov 2011

19 Two disaccharides are maltose and sucrose. Maltose is formed from two molecules of glucose, whilst sucrose is formed from fructose and glucose. Which row shows the molecular formulae of the two disaccharides? maltose sucrose A C12H22O11 C12H22O11 B C12H22O11 C12H24O12 C C12H24O12 C12H22O11 D C12H24O12 C12H24O12

1 marks

Answer: A

This question in 9700/13 Oct/Nov 2011

Q55 · Solutions of biological molecules are tested for sugars 9700/13 Oct/Nov 2011

21 Solutions of biological molecules are tested for sugars. The table shows the colours of the solutions after testing. Which may contain reducing sugars? boiled with hydrochloric acid, heated with solution neutralised, then heated with Benedict’s solution Benedict’s solution 1 blue yellow 2 green orange 3 orange red A 1, 2 and 3 B 1 and 3 only C 2 and 3 only D 1 only

1 marks

Answer: C

This question in 9700/13 Oct/Nov 2011

Q56 · Tests were performed on samples from a mixture of biological molecules 9700/11 May/June 2012

6 Tests were performed on samples from a mixture of biological molecules. When iodine in potassium iodide solution was added to a sample, the mixture turned black. When the biuret test was carried out on another sample, the mixture turned purple. Which biological molecules were in the mixture? A amylase and starch B cellulose and starch C phospholipid and cellulose D starch and phospholipid

1 marks

Answer: A

This question in 9700/11 May/June 2012

Q57 · Which of the statements about polysaccharides can be used to describe both amylopectin… 9700/11 May/June 2012

7 Which of the statements about polysaccharides can be used to describe both amylopectin and cellulose? 1 adjacent glucose molecules are rotated by 180° 2 contains 1,4 glycosidic bonds 3 polymer of α–glucose A 2 only B 3 only C 1 and 2 D 1 and 3

1 marks

Answer: A

This question in 9700/11 May/June 2012

Q58 · Which molecule in the key is sucrose? 9700/11 May/June 2012

8 Which molecule in the key is sucrose? is a reducing sugar yes no contains pentose sugar contains hexose sugar yes no yes no A B C D

1 marks

Answer: C

This question in 9700/11 May/June 2012

Q59 · Which molecules have a structural formula that contains C=O bonds? 9700/11 May/June 2012

9 Which molecules have a structural formula that contains C=O bonds? 1 fatty acids 2 glucose 3 glycerol A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3

1 marks

Answer: A

This question in 9700/11 May/June 2012

Q60 · Glycogen is a polymer of glucose 9700/12 May/June 2012

7 Glycogen is a polymer of glucose. Which description summarises its structure? A α-glucose joined by glycosidic bonds involving carbons 1 and 4 B α-alpha glucose joined by glycosidic bonds involving carbons 1, 4 and 6 C β-beta glucose joined by glycosidic bonds involving carbons 1 and 4 D β-beta glucose joined by glycosidic bonds involving carbons 1, 4 and 6

1 marks

Answer: B

This question in 9700/12 May/June 2012

Q61 · Which molecules contain C=O bonds? 9700/12 May/June 2012

8 Which molecules contain C=O bonds? 1 amino acids 2 fatty acids 3 proteins A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3

1 marks

Answer: D

This question in 9700/12 May/June 2012

Q62 · Which of the statements about polysaccharides can be used to describe both amylose and… 9700/12 May/June 2012

9 Which of the statements about polysaccharides can be used to describe both amylose and amylopectin? 1 contains 1,4 glycosidic bonds 2 contains 1,6 glycosidic bonds 3 polymer of α-glucose A 1 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3

1 marks

Answer: B

This question in 9700/12 May/June 2012

Q63 · Which carbohydrate gives a brick red colour when heated with Benedict’s solution? 9700/12 May/June 2012

10 Which carbohydrate gives a brick red colour when heated with Benedict’s solution? A cellulose B fructose C glycogen D sucrose

1 marks

Answer: B

This question in 9700/12 May/June 2012

Q64 · The diagram shows two molecules of glucose 9700/12 May/June 2012

11 The diagram shows two molecules of glucose. Four possible bonding positions are labelled p, q, r, and s, and t, u, v, w. p t CH2OH CH2OH O O OH OH HO OH HO OH s q w u OH OH r v When these two molecules condense during the formation of a glycogen molecule, where could bonds form? A p – u or q – w B q – w or p – v C r – t or q – u D s – w or r – v

1 marks

Answer: A

This question in 9700/12 May/June 2012

Q65 · Which molecule in the key is sucrose? 9700/13 May/June 2012

12 Which molecule in the key is sucrose? is a reducing sugar yes no contains pentose sugar contains hexose sugar yes no yes no A B C D

1 marks

Answer: C

This question in 9700/13 May/June 2012

Q66 · Which of the statements about polysaccharides can be used to describe both amylopectin… 9700/13 May/June 2012

14 Which of the statements about polysaccharides can be used to describe both amylopectin and cellulose? 1 adjacent glucose molecules are rotated by 180° 2 contains 1,4 glycosidic bonds 3 polymer of α–glucose A 2 only B 3 only C 1 and 2 D 1 and 3

1 marks

Answer: A

This question in 9700/13 May/June 2012

Q67 · Which molecules have a structural formula that contains C=O bonds? 9700/13 May/June 2012

16 Which molecules have a structural formula that contains C=O bonds? 1 fatty acids 2 glucose 3 glycerol A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3

1 marks

Answer: A

This question in 9700/13 May/June 2012

Q68 · Which row is correct for each of the molecules? 9700/11 Oct/Nov 2012

8 Which row is correct for each of the molecules? β-glucose collagen haemoglobin sucrose A hexose sugar structural contains the formed by with a molecular function, found in elements carbon, releasing a formula C6H12O6 tendons and hydrogen, iron, molecule of water blood vessel nitrogen and in a hydrolysis walls sulfur reaction B repeating a molecule each non-protein composed of two monomer of the consists of three haem group monosaccharides polysaccharide, polypeptide contains a central linked by a cellulose chains, each iron ion glycosidic bond containing a prosthetic group C monomer of the molecules lie has two identical formed by 1,6 glycosidic parallel to each α chains and two condensation of branches of the other, with cross- identical β chains two identical polysaccharide, links and monosaccharides glycogen staggered ends in its ring D polypeptide has all four levels digestion yields structure, the chains interact to of protein glucose and hydroxyl group of produce a fibrous structure and at fructose in equal carbon atom 1 is protein least four types of proportions above the plane bond of the ring

1 marks

Answer: D

This question in 9700/11 Oct/Nov 2012

Q69 · Which pair of monosaccharides form sucrose? 9700/11 Oct/Nov 2012

10 Which pair of monosaccharides form sucrose? CH2OH CH2OH H O H H O OH H H A OH H OH H OH OH OH H H OH H OH CH2OH CH2OH H O H H O H H H B OH H OH H OH OH OH OH H OH H OH CH2OH HOCH2 O CH2OH H O H H H OH C OH H H OH OH OH OH H H OH CH2OH HOCH2 O CH2OH H O OH H H OH D OH H H OH OH H OH H H OH

1 marks

Answer: C

This question in 9700/11 Oct/Nov 2012

Q70 · Which statement about triglycerides is correct? 9700/11 Oct/Nov 2012

11 Which statement about triglycerides is correct? A They are made up of three fatty acids combined with glycogen. B They are more saturated with hydrogen compared with phospholipids. C They form a bilayer in the membranes of cells. D They have a lower ratio of oxygen to carbon compared with carbohydrates.

1 marks

Answer: D

This question in 9700/11 Oct/Nov 2012

Q71 · Which molecules contain C=O bonds? 9700/11 Oct/Nov 2012

12 Which molecules contain C=O bonds? 1 amino acids 2 fatty acids 3 glycerol A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3

1 marks

Answer: A

This question in 9700/11 Oct/Nov 2012

Q72 · Which of the statements about polysaccharides can be used to describe both amylose and… 9700/11 Oct/Nov 2012

13 Which of the statements about polysaccharides can be used to describe both amylose and glycogen? 1 contains 1,4 glycosidic bonds 2 contains 1,6 glycosidic bonds 3 polymer of α–glucose A 1 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3

1 marks

Answer: B

This question in 9700/11 Oct/Nov 2012

Q73 · Heating with which solution breaks glycosidic bonds? 9700/12 Oct/Nov 2012

7 Heating with which solution breaks glycosidic bonds? A Benedict’s solution B dilute hydrochloric acid C dilute sodium hydroxide D ethanol

1 marks

Answer: B

This question in 9700/12 Oct/Nov 2012

Q74 · The diagram shows four molecules 9700/12 Oct/Nov 2012

8 The diagram shows four molecules. P Q CH2OH O O O HOCH2 OH C C C O O O C C C C C C H H H H H C C C C C C H H OH H HO OH C C C C C C C C C O O C OH OH H OH R S CH2OH O O O HOCH2 CH2OH C C C O O O C C C C C C H OH H H H OH OH C C C H C C C OH HO H C C C C C C C C C O O C OH H H OH Which two molecules condense to form sucrose? A P and Q B P and S C R and Q D R and S

1 marks

Answer: B

This question in 9700/12 Oct/Nov 2012

Q75 · Which molecules have a structural formula that contains C=O bonds? 9700/12 Oct/Nov 2012

9 Which molecules have a structural formula that contains C=O bonds? 1 glucose 2 glycerol 3 protein A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3 only

1 marks

Answer: B

This question in 9700/12 Oct/Nov 2012

Q76 · Which of the statements about polysaccharides can be used to describe both glycogen and… 9700/12 Oct/Nov 2012

11 Which of the statements about polysaccharides can be used to describe both glycogen and amylopectin? 1 contains 1,4 glycosidic bonds 2 contains 1,6 glycosidic bonds 3 polymer of α–glucose A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3

1 marks

Answer: D

This question in 9700/12 Oct/Nov 2012

Q77 · What is the general formula for starch? 9700/13 Oct/Nov 2012

6 What is the general formula for starch? A (C5H10O5)n B (C5H10O6)n C (C6H12O6)n D (C6H10O5)n

1 marks

Answer: D

This question in 9700/13 Oct/Nov 2012

Q78 · Which of the statements about polysaccharides can be used to describe both starch and… 9700/13 Oct/Nov 2012

9 Which of the statements about polysaccharides can be used to describe both starch and cellulose? 1 adjacent glucose molecules are rotated by 180° 2 contains glycosidic bonds 3 polymer of α–glucose A 1 only B 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: B

This question in 9700/13 Oct/Nov 2012

Q79 · Polymers of molecule X or polymers of molecule Y can be formed using glycosidic bonds 9700/13 Oct/Nov 2012

12 Polymers of molecule X or polymers of molecule Y can be formed using glycosidic bonds. CH2OH CH2OH O O OH HO OH OH HO OH OH OH molecule X molecule Y Which statement is correct? A Many of molecule X join to form amylose. B Many of molecule X join to form cellulose. C Many of molecule Y join to form amylopectin. D Many of molecule Y join to form glycogen.

1 marks

Answer: A

This question in 9700/13 Oct/Nov 2012

Q80 · X and Y show the structures of two hexose sugars 9700/11 May/June 2013

7 X and Y show the structures of two hexose sugars. CH2OH CH2OH C O C O H OH H H H H C C C C HO H HO H HO H HO OH C C C C H OH H OH X Y Which statement is correct? A X is found in amylopectin. B X is found in amylose. C Y is found in cellulose. D Y is found in glycogen.

1 marks

Answer: D

This question in 9700/11 May/June 2013

Q81 · The structural formula of a carbohydrate molecule can be shown as: H C O H C OH HO C H H… 9700/11 May/June 2013

8 The structural formula of a carbohydrate molecule can be shown as: H C O H C OH HO C H H C OH H C OH CH2OH Which of the molecules could be represented by this formula? 1 α glucose 2 deoxyribose 3 ribose A 1 only B 2 only C 2 and 3 only D 1, 2 and 3

1 marks

Answer: A

This question in 9700/11 May/June 2013

Q82 · What occurs when sucrose is broken down to monosaccharides? 9700/11 May/June 2013

9 What occurs when sucrose is broken down to monosaccharides? A condensation of reducing sugars releasing water B condensation of reducing sugars using water C hydrolysis, releasing reducing sugars and releasing water D hydrolysis, releasing reducing sugars and using water

1 marks

Answer: D

This question in 9700/11 May/June 2013

Q83 · One naturally occurring polysaccharide is an unbranched chain of the molecule… 9700/11 May/June 2013

10 One naturally occurring polysaccharide is an unbranched chain of the molecule acetylglucosamine linked by β-1, 4 glycosidic bonds. There are –CH2OH groups that alternate on each side of the polysaccharide chain. Many hydrogen bonds form between these unbranched chains. Which polysaccharide has a structure similar to that described? A amylose B amylopectin C cellulose D glycogen

1 marks

Answer: C

This question in 9700/11 May/June 2013

Q84 · Which molecules have properties that are dependent on hydrogen bonds? 9700/11 May/June 2013

11 Which molecules have properties that are dependent on hydrogen bonds? 1 cellulose 2 glycogen 3 haemoglobin 4 water A 1, 2 and 3 only B 1, 2 and 4 only C 1, 3 and 4 only D 2, 3 and 4 only

1 marks

Answer: C

This question in 9700/11 May/June 2013

Q85 · Which describes the emulsion test for the presence of lipids? 9700/12 May/June 2013

8 Which describes the emulsion test for the presence of lipids? A Add ethanol and shake. B Add ethanol, pour into water and shake. C Add water and shake. D Add water, pour into ethanol and shake.

1 marks

Answer: B

This question in 9700/12 May/June 2013

Q86 · The structural formula of a carbohydrate molecule can be shown as: H C O H C OH HO C H H… 9700/12 May/June 2013

9 The structural formula of a carbohydrate molecule can be shown as: H C O H C OH HO C H H C OH H C OH CH2OH Which of the molecules could be represented by this formula? 1 ribose 2 β-glucose 3 sucrose A 1 only B 2 only C 1 and 2 only D 2 and 3 only

1 marks

Answer: B

This question in 9700/12 May/June 2013

Q87 · The diagram shows part of a molecule of glycogen 9700/12 May/June 2013

10 The diagram shows part of a molecule of glycogen. How does the molecule differ from a molecule of amylose? A Amylose has only α-1,4 glycosidic bonds. B Amylose has only β-1,4 glycosidic bonds. C Amylose has α-1,6 glycosidic bonds with 1,4 linkages forming branches. D Amylose has β-1,4 glycosidic bonds with 1,6 linkages forming branches.

1 marks

Answer: A

This question in 9700/12 May/June 2013

Q88 · Which molecules contain a carboxyl group? 9700/12 May/June 2013

11 Which molecules contain a carboxyl group? 1 amino acid 2 glycerol 3 saturated fatty acid 4 unsaturated fatty acid A 1 and 2 only B 3 and 4 only C 1, 3 and 4 only D 2, 3 and 4 only

1 marks

Answer: C

This question in 9700/12 May/June 2013

Q89 · When investigating the rate of reaction of the enzyme lipase on the hydrolysis of… 9700/12 May/June 2013

15 When investigating the rate of reaction of the enzyme lipase on the hydrolysis of triglycerides, the pH must be maintained at an optimum to prevent the lipase denaturing. What is the reason for this? A The addition of water molecules produced by hydrolysis increases pH. B The products of hydrolysis decrease the pH. C The products of hydrolysis increase the pH. D The removal of water molecules used in hydrolysis decreases pH.

1 marks

Answer: B

This question in 9700/12 May/June 2013

Q90 · The structural formula of a carbohydrate molecule can be shown as: H C O H C OH HO C H HO… 9700/13 May/June 2013

8 The structural formula of a carbohydrate molecule can be shown as: H C O H C OH HO C H HO C H H C OH CH2OH Which of the molecules could be represented by this formula? 1 β-glucose 2 deoxyribose 3 ribose A 1 only B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: A

This question in 9700/13 May/June 2013

Q91 · The diagram shows part of a molecule of a carbohydrate formed by glucose 9700/13 May/June 2013

9 The diagram shows part of a molecule of a carbohydrate formed by glucose. What is the name of the molecule? A amylose B cellulose C glycogen D starch

1 marks

Answer: C

This question in 9700/13 May/June 2013

Q92 · A naturally occurring polysaccharide is a branched chain of α-glucose 9700/13 May/June 2013

10 A naturally occurring polysaccharide is a branched chain of α-glucose. The straight parts of the molecule are linked by α-1, 6 glycosidic bonds with a small number of branches which are linked by either an α-1, 3 glycosidic bond or an α-1, 4 glycosidic bond. Which polysaccharide has a structure most similar to that described? A amylopectin B amylose C cellulose D glycogen

1 marks

Answer: A

This question in 9700/13 May/June 2013

Q93 · Which molecule has properties that are not dependent on hydrogen bonds? 9700/13 May/June 2013

11 Which molecule has properties that are not dependent on hydrogen bonds? A cellulose B glycogen C haemoglobin D water

1 marks

Answer: B

This question in 9700/13 May/June 2013

Q94 · Which diagram shows the reaction that occurs to link two monomers that form cellulose? 9700/11 Oct/Nov 2013

6 Which diagram shows the reaction that occurs to link two monomers that form cellulose? C C C C H C O H H C O H H C O H H C O H A C C C C C C O C C HO C C OH HO C C OH HO C C C C OH H2O H2O C C C C H C O OH H C O OH H C O C O OH B C C C C C C C C HO C C H HO C C H HO C C H HO C C H H2O C C H C O O H HO C C H H C O C C H C C C C C C C O C C HO C C H H C O OH HO C C H H C O OH C C H2O C C H C O H HO C C OH H C O C C OH D C C C C C C C C HO C C OH H C O H HO C C OH H C O H C C

1 marks

Answer: C

This question in 9700/11 Oct/Nov 2013

Q95 · Which bonds will be broken when a molecule of glycogen is hydrolysed? 9700/11 Oct/Nov 2013

7 Which bonds will be broken when a molecule of glycogen is hydrolysed? 1 α-1, 4 2 β-1, 4 3 α-1, 6 4 β-1, 6 A 1 and 3 only B 2 and 4 only C 1, 2 and 3 only D 2, 3 and 4 only

1 marks

Answer: A

This question in 9700/11 Oct/Nov 2013

Q96 · Each list, 1, 2 and 3, shows some substances found in animal tissues 9700/11 Oct/Nov 2013

10 Each list, 1, 2 and 3, shows some substances found in animal tissues. 1 glucose, cholesterol, triglycerides, water. 2 glycogen, antibodies, adenine, phospholipids. 3 haemoglobin, carbon dioxide, mRNA, monosaccharides. Which shows one or more substances that contain nitrogen atoms? A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: D

This question in 9700/11 Oct/Nov 2013

Question 97 9700/12 Oct/Nov 2013

6 Which shows β-glucose? A B CH2OH CH2OH H C O OH H C O H H H C C C C OH H OH H HO C C H HO C C OH H OH H OH C D OH H H C O OH HO C O H H OH C C C C H H H H HO C C H H C C OH CH2OH OH CH2OH OH

1 marks

Answer: A

This question in 9700/12 Oct/Nov 2013

Q98 · Which row is correct when one molecule of sucrose is hydrolysed? 9700/12 Oct/Nov 2013

7 Which row is correct when one molecule of sucrose is hydrolysed? molecules of molecules of reducing sugar water A 1 1 B 1 2 C 2 1 D 2 2

1 marks

Answer: C

This question in 9700/12 Oct/Nov 2013

Q99 · The formation of glycosidic and peptide bonds is responsible for polymerisation in some… 9700/12 Oct/Nov 2013

8 The formation of glycosidic and peptide bonds is responsible for polymerisation in some biological molecules. Which bonds are found in which molecules? glycosidic peptide A glycerol glycoprotein B glycogen glycerol C glycogen glycoprotein D glycoprotein glycolipid

1 marks

Answer: C

This question in 9700/12 Oct/Nov 2013

Q100 · Which shows the basic unit of cellulose? 9700/13 Oct/Nov 2013

6 Which shows the basic unit of cellulose? A B CH2OH CH2OH H C O OH H C O H H H C C C C OH H OH H HO C C H HO C C OH H OH H OH C D OH H H C O OH HO C O H H OH C C C C H H H H HO C C H H C C OH CH2OH OH CH2OH OH

1 marks

Answer: A

This question in 9700/13 Oct/Nov 2013

Q101 · Which diagram shows part of a structural polysaccharide? 9700/13 Oct/Nov 2013

8 Which diagram shows part of a structural polysaccharide? O O O O A O O O O O O O O O B O O O O O O O C O O O O O O O O O O O D O O O O O

1 marks

Answer: B

This question in 9700/13 Oct/Nov 2013

Q102 · The molecule shown is a polymer of reducing sugars 9700/11 May/June 2014

7 The molecule shown is a polymer of reducing sugars. CH2OH CH2OH CH2OH CH2OH O O O O OH OH OH OH O O O HO OH OH OH OH OH Which procedures could be carried out in order to test for the presence of the reducing sugars in this molecule? 1 Add hydrolytic enzyme and then heat with Benedict’s reagent. 2 Dissolve in water, neutralise and then heat with Benedict’s reagent. 3 Boil with hydrochloric acid, neutralise and then heat with Benedict’s reagent. A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: C

This question in 9700/11 May/June 2014

Q103 · Which molecules show the structure of α-glucose and of β-glucose? 9700/11 May/June 2014

8 Which molecules show the structure of α-glucose and of β-glucose? α-glucose β-glucose CH2OH CH2OH O OH O A OH OH HO HO OH OH OH CH2OH CH2OH O O OH B OH OH OH HO OH HO OH CH2OH CH2OH O O OH C OH OH HO OH HO OH OH CH2OH CH2OH O OH O D OH OH OH HO HO OH OH

1 marks

Answer: C

This question in 9700/11 May/June 2014

Q104 · In unsaturated lipid molecules, where are double bonds located? 9700/11 May/June 2014

9 In unsaturated lipid molecules, where are double bonds located? A between fatty acids and glycerol B within fatty acids and within glycerol C within fatty acids only D within glycerol only

1 marks

Answer: C

This question in 9700/11 May/June 2014

Q105 · Which shows the basic unit of glycogen? 9700/12 May/June 2014

7 Which shows the basic unit of glycogen? A B CH2OH CH2OH H C O OH H C O H H H C C C C OH H OH H HO C C H HO C C OH H OH H OH C D H CH2OH H C O CH2OH HO C O OH H H C C C C H OH OH H HO C C OH H C C H OH H H OH

1 marks

Answer: B

This question in 9700/12 May/June 2014

Q106 · Which features adapt a cellulose molecule for its function? 9700/12 May/June 2014

9 Which features adapt a cellulose molecule for its function? 1 Long chains of glucose molecules coil into a helix. 2 Many hydrogen bonds form between adjacent chains. 3 It is insoluble in water. A 1, 2 and 3 B 1 and 3 only C 2 and 3 only D 2 only

1 marks

Answer: C

This question in 9700/12 May/June 2014

Q107 · The structure of phospholipids and triglycerides include the following 9700/12 May/June 2014

10 The structure of phospholipids and triglycerides include the following. 1 glycerol linked to fatty acids 2 hydrophobic fatty acid chains 3 saturated fatty acid chains Which structures enable the formation of a lipid bilayer in cell surface membranes? A 1 and 2 B 1 and 3 C 2 and 3 D 2 only

1 marks

Answer: D

This question in 9700/12 May/June 2014

Q108 · A student carried out four tests for biological molecules on a solution 9700/13 May/June 2014

6 A student carried out four tests for biological molecules on a solution. The results are shown in the table. test for biological observation molecule iodine solution orange biuret blue Benedict’s orange emulsion clear Which molecules are present in this solution? 1 2 H OH HO CH2 C C CH2OH H O N C O H H OH HO CH2 C C C C O OH H H OH H N C C CH3 C C H H OH O N H H 3 4 H O CH2OH H C O C R C O O H H H C C H C O C R OH H HO OH O C C H OH H C O C R H A 1 and 3 B 1 and 4 C 2 and 3 D 3 and 4

1 marks

Answer: C

This question in 9700/13 May/June 2014

Q109 · Which bonds will be broken when a molecule of amylose is hydrolysed? 9700/13 May/June 2014

7 Which bonds will be broken when a molecule of amylose is hydrolysed? 1 α1,4 2 β1,4 3 α1,6 4 β1,6 A 1 and 3 B 2 and 4 C 1 only D 2 only

1 marks

Answer: C

This question in 9700/13 May/June 2014

Q110 · Which statement describes how the molecular structure of starch is suited to its function? 9700/13 May/June 2014

8 Which statement describes how the molecular structure of starch is suited to its function? A Amylose has a branched structure and amylopectin is coiled to give a compact molecule for transport. B In the breakdown of amylose and amylopectin, many condensation reactions release stored energy. C In the formation of amylose and amylopectin, many hydrolysis reactions allow the release of stored energy. D The amylose-amylopectin complex is insoluble and does not affect the water potential of the cell.

1 marks

Answer: D

This question in 9700/13 May/June 2014

Q111 · Which comparative statements concerning biological molecules are correct? 9700/13 May/June 2014

9 Which comparative statements concerning biological molecules are correct? 1 A collagen molecule is a fibrous protein that contains many amino acids with hydrophobic R-groups whereas a haemoglobin molecule is a globular protein with no amino acids with hydrophobic R-groups. 2 Sucrose hydrolysis results in glycosidic bond breakage and the production of equal proportions of fructose and α-glucose molecules, whereas cellulose hydrolysis results in only β-glucose molecules. 3 The glycosidic bonds of glycogen have been formed between two α-glucose molecules, whereas with amylopectin, the bonds have been formed between an α-glucose molecule and a β-glucose molecule. A 1 and 2 B 1 and 3 C 2 only D 3 only

1 marks

Answer: C

This question in 9700/13 May/June 2014

Q112 · In triglyceride molecules, where are double bonds located? 9700/13 May/June 2014

10 In triglyceride molecules, where are double bonds located? A between fatty acids and glycerol B within fatty acids and within glycerol C within fatty acids only D within glycerol only

1 marks

Answer: C

This question in 9700/13 May/June 2014

Q113 · The diagram shows a triglyceride molecule that has been partially hydrolysed 9700/11 Oct/Nov 2014

6 The diagram shows a triglyceride molecule that has been partially hydrolysed. H H C OH H C OH O H H H H H H H H H H C O C C C C C C C C C H C H C H H H H H H H H H C H H C H H C H H C H H C H H C H C H H H What will be the products of the total hydrolysis of the molecule shown? A a molecule of glycerol and a saturated fatty acid molecule only B a molecule of glycerol and an unsaturated fatty acid molecule only C a molecule of water, a molecule of glycerol and a saturated fatty acid molecule D a molecule of water, a molecule of glycerol and an unsaturated fatty acid molecule

1 marks

Answer: B

This question in 9700/11 Oct/Nov 2014

Question 114 9700/11 Oct/Nov 2014

7 Which shows α-glucose? A B CH2OH CH2OH H C O OH H C O H H H C C C C OH H OH H HO C C H HO C C OH H OH H OH C D H CH2OH H C O CH2OH HO C O OH H H C C C C H H OH H HO C C OH H C C H OH OH H OH

1 marks

Answer: B

This question in 9700/11 Oct/Nov 2014

Q115 · Which correctly matches the functional and structural features of cellulose, collagen… 9700/11 Oct/Nov 2014

8 Which correctly matches the functional and structural features of cellulose, collagen, glycogen or triglyceride? structure molecule held function fibrous together by branched chains hydrogen bonds A cellulose support J Jv x triglyceride | energy source x x x B collagen strengthening Jv Jv x cellulose support v x J Cc collagen strengthening Jv Jv Jv glycogen storage x x v D glycogen storage x Jv Jv triglyceride | energy source x Jv x key /=true xX = false

1 marks

Answer: A

This question in 9700/11 Oct/Nov 2014

Q116 · Two disaccharides are maltose and sucrose 9700/12 Oct/Nov 2014

8 Two disaccharides are maltose and sucrose. Maltose is formed from two molecules of glucose, whilst sucrose is formed from fructose and glucose. Which row shows the molecular formulae of the two disaccharides? maltose sucrose A C12H22O11 C12H22O11 B C12H22O11 C12H24O12 C C12H24O12 C12H22O11 D C12H24O12 C12H24O12

1 marks

Answer: A

This question in 9700/12 Oct/Nov 2014

Q117 · The diagram shows a carbohydrate molecule 9700/12 Oct/Nov 2014

9 The diagram shows a carbohydrate molecule. CH2OH C O OH HO O HO CH2OH CH2 CH2OH C O C O C O OH OH OH O O HO OH HO HO HO Of which polymers could this be a part? A amylopectin and cellulose B amylose and starch C glycogen and amylose D starch and glycogen

1 marks

Answer: D

This question in 9700/12 Oct/Nov 2014

Q118 · Which type of sugar and types of bonds are found in a DNA molecule? 9700/12 Oct/Nov 2014

21 Which type of sugar and types of bonds are found in a DNA molecule? type of sugar types of bonds A non-reducing hydrogen and ionic B non-reducing hydrogen and peptide C reducing covalent and hydrogen D reducing hydrogen and peptide

1 marks

Answer: C

This question in 9700/12 Oct/Nov 2014

Q119 · The diagram shows a section of a polysaccharide 9700/13 Oct/Nov 2014

7 The diagram shows a section of a polysaccharide. C C C O C C C O O C C C C C C O C C C O C C C In which polysaccharide(s) could this section be found? 1 amylose 2 cellulose 3 glycogen A 1 only B 2 only C 1 and 3 D 2 and 3

1 marks

Answer: B

This question in 9700/13 Oct/Nov 2014

Q120 · Chromatography is a technique used to separate molecules by their solubility 9700/13 Oct/Nov 2014

8 Chromatography is a technique used to separate molecules by their solubility. The diagram shows one apparatus used for this technique. absorbent paper a mixture containing one or solvent more types of molecules As the solvent rises up the paper, the molecules with the greatest solubility in the solvent travel a fixed distance up the paper. When the solvent reaches the top of the paper, the paper is removed, dried and sprayed with a dye. The different molecules appear as coloured spots. Chromatography was carried out on four different carbohydrates; sucrose, cellulose, the products of hydrolysis of sucrose and the products of hydrolysis of cellulose. Which diagram shows the presence of the products of sucrose digestion? A B C D

1 marks

Answer: D

This question in 9700/13 Oct/Nov 2014

Q121 · In all lipid molecules, where are double bonds located? 9700/13 Oct/Nov 2014

9 In all lipid molecules, where are double bonds located? A between fatty acids and glycerol B within fatty acids and within glycerol C within fatty acids only D within glycerol only

1 marks

Answer: C

This question in 9700/13 Oct/Nov 2014

Q122 · Which row shows the correct match between the descriptions of biological molecules and… 9700/11 May/June 2015

9 Which row shows the correct match between the descriptions of biological molecules and where they are found? 1 a linear polymer of 1,4 linked β-glucose molecules 2 a bipolar, phosphate containing molecule 3 a highly branched polymer of 1,4 and 1,6 linked α-glucose molecules 1 2 3 A eukaryote and cell surface forming storage prokaryote cell walls membranes of both granules in the cells eukaryotes and of prokaryotes prokaryotes B eukaryote cell walls cell surface forming storage membranes of both granules in the cells eukaryotes and of some eukaryotes prokaryotes C eukaryote cell walls cell surface forming starch membranes of both grains in the cells of eukaryotes and all eukaryotes prokaryotes D forms storage prokaryote cell walls eukaryote cell walls granules in the cells of eukaryotes

1 marks

Answer: B

This question in 9700/11 May/June 2015

Q123 · Which is the correct description for the structure of amylose and cellulose? 9700/11 May/June 2015

10 Which is the correct description for the structure of amylose and cellulose? amylose cellulose A α-glucose β-glucose 180° rotation no rotation 1,4 and 1,6 linkages 1,4 linkages B α-glucose β-glucose no rotation 180° rotation 1,4 linkages 1,4 linkages C α-glucose α-glucose no rotation 180° rotation 1,4 linkages 1,4 and 1,6 linkages D β-glucose α-glucose no rotation 180° rotation 1,4 linkages 1,4 linkages

1 marks

Answer: B

This question in 9700/11 May/June 2015

Q124 · Which bonds hold together the structure of cellulose? 9700/12 May/June 2015

10 Which bonds hold together the structure of cellulose? 1 glycosidic 2 hydrogen 3 ionic A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: B

This question in 9700/12 May/June 2015

Q125 · Which bonds are found in glycogen? 9700/12 May/June 2015

11 Which bonds are found in glycogen? 1-4, α bonds A B 1-4, β bonds 1-6, α bonds C D

1 marks

Answer: B

This question in 9700/12 May/June 2015

Q126 · Solutions of biological molecules are tested for sugars 9700/12 May/June 2015

12 Solutions of biological molecules are tested for sugars. The table shows the colours of the solutions after testing. boiled with hydrochloric acid, heated with solution neutralised, then heated with Benedict’s solution Benedict’s solution 1 blue orange 2 green green 3 yellow red Which may contain non-reducing sugars? A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: C

This question in 9700/12 May/June 2015

Q127 · Which molecule is α-glucose? 9700/13 May/June 2015

7 Which molecule is α-glucose? A B C D CH2OH CH2OH CH2OH O O HOCH2 O CH2OH O OH OH H OH H H H H H OH H OH H H H OH OH OH H H H OH H OH OH H OH H OH OH H H OH

1 marks

Answer: D

This question in 9700/13 May/June 2015

Q128 · Which diagram shows the bond linking the individual units of both glycogen and amylose? 9700/11 Oct/Nov 2015

7 Which diagram shows the bond linking the individual units of both glycogen and amylose? A B C D H C O P O C C N C C C O C C O C C O O

1 marks

Answer: C

This question in 9700/11 Oct/Nov 2015

Q129 · Which row describes a triglyceride? 9700/11 Oct/Nov 2015

9 Which row describes a triglyceride? A v Jv B v x Cc x J D x x key ¥ = correct X = not correct

1 marks

Answer: D

This question in 9700/11 Oct/Nov 2015

Q130 · A solution containing equal masses of amylose and amylopectin is completely hydrolysed 9700/11 Oct/Nov 2015

10 A solution containing equal masses of amylose and amylopectin is completely hydrolysed. Which molecules will be found after the hydrolysis? A α-glucose only B β-glucose only C equal masses of α-glucose and β-glucose D more α-glucose than β-glucose

1 marks

Answer: A

This question in 9700/11 Oct/Nov 2015

Q131 · The colour of a positive Benedict’s test is due to the formation of copper oxide 9700/12 Oct/Nov 2015

7 The colour of a positive Benedict’s test is due to the formation of copper oxide. The mass of copper oxide is proportional to the mass of reducing sugar present. Samples of fruit juice were tested for the presence of reducing sugars and non-reducing sugars using the Benedict’s test. The results show the mass of copper oxide after boiling with Benedict’s solution and after acid hydrolysis and boiling with Benedict’s solution. Which sample contained the most non-reducing sugar? mass of precipitate / mg after boiling with after acid hydrolysis and Benedict’s solution boiling with Benedict’s solution A 20 20 B 30 45 C 50 55 D 65 75

1 marks

Answer: B

This question in 9700/12 Oct/Nov 2015

Q132 · Which diagram shows the bond linking the individual units of both cellulose and glycogen? 9700/12 Oct/Nov 2015

8 Which diagram shows the bond linking the individual units of both cellulose and glycogen? A B C D H C O P O C C N C C C O C C C O C O O

1 marks

Answer: D

This question in 9700/12 Oct/Nov 2015

Q133 · Which row describes a triglyceride? 9700/12 Oct/Nov 2015

9 Which row describes a triglyceride? hydrophilic | S9UPS In A J J B J x c x J D x x key JY correct X not correct

1 marks

Answer: C

This question in 9700/12 Oct/Nov 2015

Q134 · The synthesis of biological molecules requires the formation of bonds 9700/13 Oct/Nov 2015

8 The synthesis of biological molecules requires the formation of bonds. Which row is correct? a bond forms between a β-1,4 bond forms the hydroxyl group of the carboxylic the phosphate of one between the monomers acid group is removed and a monomer and the sugar to give an unbranched carbon-nitrogen bond is formed to of the next monomer chain give an unbranched chain A polynucleotide amylose polypeptide B polynucleotide cellulose polypeptide C phospholipid amylose polynucleotide D phospholipid cellulose polynucleotide

1 marks

Answer: B

This question in 9700/13 Oct/Nov 2015

Q135 · Which row describes a triglyceride? 9700/13 Oct/Nov 2015

9 Which row describes a triglyceride? hydrophobic insoue in A v v key B v x ¥ correct Cc x v X not correct D x x

1 marks

Answer: B

This question in 9700/13 Oct/Nov 2015

Q136 · What may take place during a hydrolysis reaction? 9700/12 Feb/March 2016

6 What may take place during a hydrolysis reaction? 1 a molecule of water is produced 2 a glycosidic bond is broken 3 a sucrose molecule is split into fructose and glucose A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: D

This question in 9700/12 Feb/March 2016

Q137 · The table shows some information about four carbohydrate polymers 9700/12 Feb/March 2016

7 The table shows some information about four carbohydrate polymers. a-1,4 a-1,6 0 shape of polymer | glycosidic glycosidic molecule bonds bonds 1 v x helical 2 x v branched 3 Jv v helical 4 Jv v branched Which two polymers form starch? B 1and4 C 2and3 A 1and2 key /¥ = present X = absent D 3and4

1 marks

Answer: B

This question in 9700/12 Feb/March 2016

Q138 · Which molecule in the key is sucrose? 9700/12 Feb/March 2016

8 Which molecule in the key is sucrose? is a reducing sugar yes no contains pentose sugar contains hexose sugar yes no yes no A B C D

1 marks

Answer: C

This question in 9700/12 Feb/March 2016

Q139 · Which statements about triglycerides and phospholipids are correct? 9700/12 Feb/March 2016

9 Which statements about triglycerides and phospholipids are correct? 1 Triglycerides and phospholipids both have a hydrophobic region. 2 Triglycerides are non-polar molecules and phospholipids are polar. 3 Fatty acids in a triglyceride may be saturated or unsaturated but in a phospholipid they are always saturated. A 1 and 2 B 1 and 3 C 2 only D 3 only

1 marks

Answer: A

This question in 9700/12 Feb/March 2016

Q140 · X and Y are two monomers found in biological polymers 9700/11 May/June 2016

7 X and Y are two monomers found in biological polymers. CH2OH CH2OH O O H OH H H H H OH H OH H HO H HO OH H OH H OH X Y Which monomer is found in each of cellulose, glycogen, amylopectin and amylose? cellulose glycogen amylopectin amylose A X Y X Y B X Y Y Y C Y X X X D Y X Y X

1 marks

Answer: B

This question in 9700/11 May/June 2016

Q141 · Chitin is a polysaccharide consisting of long straight chains of the monosaccharide… 9700/11 May/June 2016

8 Chitin is a polysaccharide consisting of long straight chains of the monosaccharide acetylglucosamine, linked by 1,4 glycosidic bonds. Acetylglucosamine is similar in structure to glucose, but contains nitrogen, allowing hydrogen bonds to form between adjacent chains of chitin when they lie parallel to each other. Which polysaccharide is most similar in structure to chitin? A amylopectin B amylose C cellulose D glycogen

1 marks

Answer: C

This question in 9700/11 May/June 2016

Q142 · Which statement about triglycerides is correct? 9700/11 May/June 2016

9 Which statement about triglycerides is correct? A They are made up of three fatty acids combined with glycogen. B They are more saturated with hydrogen compared with phospholipids. C They form a bilayer in the cell surface membranes of cells. D They have a lower ratio of oxygen to carbon compared with carbohydrates.

1 marks

Answer: D

This question in 9700/11 May/June 2016

Q143 · Which row shows the monomer and type of bond that form the polymer? 9700/12 May/June 2016

5 Which row shows the monomer and type of bond that form the polymer? monomer type of bond polymer A α-glucose 1,4 only starch B α-glucose 1,4 and 1,6 amylopectin C β-glucose 1,4 only glycogen D β-glucose 1,4 and 1,6 cellulose

1 marks

Answer: B

This question in 9700/12 May/June 2016

Q144 · The diagrams show four monosaccharides with the formula C6H12O6 9700/13 May/June 2016

7 The diagrams show four monosaccharides with the formula C6H12O6. Which diagram shows β-glucose? A B C D CH2OH CH2OH CH2OH CH2OH H O H H O OH H O H H O OH H H H H OH H OH H H H OH HO HO OH HO H HO OH HO H H OH H OH OH OH H H

1 marks

This question in 9700/13 May/June 2016

Q145 · The diagram shows the relationship between different polysaccharides and the glycosidic… 9700/13 May/June 2016

8 The diagram shows the relationship between different polysaccharides and the glycosidic bonds formed between the monomers. 1 2 3 4 5 Which row is correct? 1 2 3 4 5 A amylopectin α-1,-6 glycogen α-1,-4 amylopectin B amylose α-1,-4 cellulose β-1,-4 glycogen C cellulose α-1,-4 amylose α-1,-4 glycogen D glycogen β-1,-6 amylopectin α-1,-4 amylose

1 marks

This question in 9700/13 May/June 2016

Q146 · When a small quantity of phospholipid is added to a test-tube of water and then shaken… 9700/13 May/June 2016

9 When a small quantity of phospholipid is added to a test-tube of water and then shaken vigorously, an emulsion is formed by small droplets called liposomes. Which diagram shows the arrangement of phospholipid molecules in a cross-section of a liposome? A B C D

1 marks

This question in 9700/13 May/June 2016

Q147 · Which statements about fatty acids are correct? 9700/13 May/June 2016

14 Which statements about fatty acids are correct? 1 form part of cell membranes 2 form storage droplets 3 are synthesised by the Golgi body A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

This question in 9700/13 May/June 2016

Q148 · What cannot occur as a result of a condensation reaction? 9700/11 Oct/Nov 2016

7 What cannot occur as a result of a condensation reaction? A breaking of a glycosidic bond B formation of a disaccharide C joining together two amino acids D production of a molecule of water

1 marks

Answer: A

This question in 9700/11 Oct/Nov 2016

Q149 · Which pair of monosaccharides forms sucrose? 9700/11 Oct/Nov 2016

8 Which pair of monosaccharides forms sucrose? CH2OH CH2OH H O H H O OH H H A OH H OH H OH OH OH H H OH H OH CH2OH CH2OH H O H H O H H H B OH H OH H OH OH OH OH H OH H OH CH2OH HOCH2 O OH H O H H OH C H OH H H CH2OH OH OH OH H H OH CH2OH HOCH2 O OH H O OH H OH D H OH H H CH2OH OH H OH H H OH

1 marks

Answer: C

This question in 9700/11 Oct/Nov 2016

Q150 · The diagram shows the relationship between different polysaccharides and the glycosidic… 9700/11 Oct/Nov 2016

9 The diagram shows the relationship between different polysaccharides and the glycosidic bonds formed between the monomers. 1 2 3 4 5 Which row is correct? 1 2 3 4 5 A amylopectin α-1,6 cellulose β-1,4 glycogen B amylose α-1,4 glycogen β-1,4 amylopectin C cellulose β-1,4 amylose α-1,4 glycogen D glycogen α-1,6 amylopectin α-1,4 amylose

1 marks

Answer: D

This question in 9700/11 Oct/Nov 2016

Q151 · The diagrams show some of the types of bond in fatty acids 9700/11 Oct/Nov 2016

10 The diagrams show some of the types of bond in fatty acids. 1 2 3 O C C C C C C C OH Which row shows the bonds found in each type of molecule? unsaturated saturated fatty acid fatty acid A 1, 2 and 3 1 and 3 only B 1, 2 and 3 2 and 3 only C 1 and 3 only 1, 2 and 3 D 2 and 3 only 1, 2 and 3

1 marks

Answer: A

This question in 9700/11 Oct/Nov 2016

Q152 · The diagram shows how the β-glucose units of cellulose are linked to each other 9700/13 Oct/Nov 2016

8 The diagram shows how the β-glucose units of cellulose are linked to each other. CH2OH H OH CH2OH H OH O O H H H H H O OH H H O OH H OH H H O OH H H O H H H H O O H OH CH2OH H OH CH2OH What is the significance of the fact that the OH groups on carbon 2 in adjacent glucose molecules are on opposite sides of the molecule? A They can cross-link with other cellulose molecules by both hydrogen and glycosidic bonds. B They can form glycosidic bonds with adjacent OH groups of other cellulose molecules. C They can form hydrogen bonds between the CH2OH and OH on adjacent glucose molecules of the cellulose molecule. D They can form hydrogen bonds with adjacent OH and CH2OH groups of other cellulose molecules.

1 marks

Answer: D

This question in 9700/13 Oct/Nov 2016

Q153 · The table shows some information about carbohydrate polymers 9700/12 Feb/March 2017

8 The table shows some information about carbohydrate polymers. Which row describes amylose? a-1,4 a-1,6 _ a shape of glycosidic | glycosidic | iolecule bonds bonds A W, JV branched B V x helical Cc x JV branched D x x helical key / = present X = absent

1 marks

Answer: B

This question in 9700/12 Feb/March 2017

Q154 · Which row about α-glucose and β-glucose molecules is correct? 9700/12 Feb/March 2017

9 Which row about α-glucose and β-glucose molecules is correct? carbon atom on which cellulose contains both the OH position is different molecules A 1 no B 1 yes C 4 no D 4 yes

1 marks

Answer: A

This question in 9700/12 Feb/March 2017

Q155 · What is the general formula for amylopectin? 9700/11 May/June 2017

7 What is the general formula for amylopectin? A (C5H10O5)n B (C5H10O6)n C (C6H12O6)n D (C6H10O5)n

1 marks

Answer: D

This question in 9700/11 May/June 2017

Q156 · Which statement describes how the molecular structure of starch is suited to its function? 9700/11 May/June 2017

8 Which statement describes how the molecular structure of starch is suited to its function? A Amylose has a branched structure and amylopectin is coiled to give a compact molecule for transport. B In the breakdown of amylose and amylopectin, many condensation reactions release stored energy. C In the formation of amylose and amylopectin, many hydrolysis reactions allow the release of stored energy. D The amylose-amylopectin complex is insoluble and does not affect the water potential of the cell.

1 marks

Answer: D

This question in 9700/11 May/June 2017

Q157 · Cows and whales are mammals that produce milk to feed their babies 9700/11 May/June 2017

9 Cows and whales are mammals that produce milk to feed their babies. Newborn whales grow faster than newborn cows. The milk of both cows and whales contains saturated fatty acids with different chain lengths. The table shows the percentage of saturated fatty acids of different lengths in cow and whale milk. chain length of percentage of saturated saturated fatty acid fatty acids in milk / number of carbon atoms cow whale 4–12 22.2 0 14 10.6 13.8 16 25.5 27.9 18 40.1 29.4 > 18 1.6 28.9 Which statement about the ratio of short fatty acids (4–16 carbons) to long fatty acids (18 or more carbons) in the milk of cows and whales is correct? A The ratio in cow milk is higher because young cows need more energy than young whales. B The ratio in cow milk is lower because young cows need less energy than young whales. C The ratio in whale milk is higher because young whales need less energy than young cows. D The ratio in whale milk is lower because young whales need more energy than young cows.

1 marks

Answer: D

This question in 9700/11 May/June 2017

Q158 · The structure of phospholipids and triglycerides include the following 9700/11 May/June 2017

10 The structure of phospholipids and triglycerides include the following. 1 glycerol linked to fatty acids 2 hydrophobic fatty acid chains 3 saturated fatty acid chains Which structures enable the formation of a lipid bilayer in cell surface membranes? A 1 and 2 B 1 and 3 C 2 and 3 D 2 only

1 marks

Answer: D

This question in 9700/11 May/June 2017

Q159 · The diagrams show four monosaccharides with the formula C6H12O6 9700/12 May/June 2017

7 The diagrams show four monosaccharides with the formula C6H12O6. Which diagram shows α-glucose? A B C D CH2OH CH2OH CH2OH CH2OH H O OH H O H H O H H O H H H H H OH H OH H H H OH HO HO H HO OH HO OH HO OH H OH H OH OH OH H H

1 marks

Answer: B

This question in 9700/12 May/June 2017

Q160 · Complete digestion of polysaccharides requires all the glycosidic bonds between the… 9700/12 May/June 2017

8 Complete digestion of polysaccharides requires all the glycosidic bonds between the monomers to be broken. Amylase only breaks α-1,4 glycosidic bonds. Which row shows how completely amylase can digest molecules of cellulose, amylopectin or amylose? polysaccharide cellulose amylopectin amylose A – ++ + key B – + ++ – no digestion C + ++ – + some digestion D ++ – + ++ most digestion

1 marks

Answer: B

This question in 9700/12 May/June 2017

Q161 · Which diagram shows the monomer of cellulose? 9700/13 May/June 2017

6 Which diagram shows the monomer of cellulose? A B C D CH2OH CH2OH CH2OH CH2OH H O OH HO O H H O H H O OH H H H H OH H OH H OH H OH HO HO H H OH HO OH HO H H OH H OH H OH H H

1 marks

Answer: A

This question in 9700/13 May/June 2017

Q162 · Which statements about both amylose and amylopectin are correct? 9700/13 May/June 2017

9 Which statements about both amylose and amylopectin are correct? 1 They are polymers. 2 They are formed by hydrolysis reactions. 3 They are linear molecules. 4 They contain α-1,4 glycosidic bonds. A 1, 2, 3 and 4 B 1, 2 and 4 only C 1 and 4 only D 2 and 3 only

1 marks

Answer: C

This question in 9700/13 May/June 2017

Q163 · Which features adapt a cellulose molecule for its function? 9700/12 Oct/Nov 2017

8 Which features adapt a cellulose molecule for its function? 1 Long chains of glucose molecules coil into a helix. 2 Many hydrogen bonds form between adjacent chains. 3 It is insoluble in water. A 1, 2 and 3 B 1 and 3 only C 2 and 3 only D 2 only

1 marks

Answer: C

This question in 9700/12 Oct/Nov 2017

Q164 · Two disaccharides are maltose and sucrose 9700/12 Oct/Nov 2017

9 Two disaccharides are maltose and sucrose. Maltose is formed from two molecules of glucose, whilst sucrose is formed from fructose and glucose. Which row shows the molecular formulae of the two disaccharides? maltose sucrose A C12H22O11 C12H22O11 B C12H22O11 C12H24O12 C C12H24O12 C12H22O11 D C12H24O12 C12H24O12

1 marks

Answer: A

This question in 9700/12 Oct/Nov 2017

Q165 · The diagram shows the structure of the polysaccharide chitin which is found in the cell… 9700/12 Oct/Nov 2017

10 The diagram shows the structure of the polysaccharide chitin which is found in the cell wall of fungi. CH3 C O CH2OH N H CH2OH H C O C C H H C O C C O C C O C C C C H H C O C C H N H CH2OH N H O C O C CH3 CH3 Which statements are correct for chitin and for cellulose? 1 The monomers are joined by 1,4 glycosidic bonds. 2 Every second monosaccharide in the polysaccharide chain is rotated by 180°. 3 The polysaccharide contains the elements carbon, hydrogen, oxygen and nitrogen. A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: B

This question in 9700/12 Oct/Nov 2017

Q166 · Which row correctly matches the functional and structural features of cellulose… 9700/12 Oct/Nov 2017

11 Which row correctly matches the functional and structural features of cellulose, collagen, glycogen or triglyceride? structure molecules held molecule function fibrous together by branched chains hydrogen bonds A cellulose support Jv Jv x triglyceride energy source x x x B collagen strengthening Jv Jv x cellulose support Jv x Jv Cc collagen strengthening Jv Jv Jv glycogen storage x x Jv D glycogen storage x Jv Jv triglyceride | energy source x Jv x key J=true X = false

1 marks

Answer: A

This question in 9700/12 Oct/Nov 2017

Q167 · What are the features of triglycerides? 9700/12 Oct/Nov 2017

13 What are the features of triglycerides? lower proportion A Jv Jv x B Jv x J Cc x v x D x x J key J/ = yes X =no

1 marks

Answer: C

This question in 9700/12 Oct/Nov 2017

Q168 · A student carried out four tests for biological molecules on a sample of milk 9700/13 Oct/Nov 2017

6 A student carried out four tests for biological molecules on a sample of milk. The tests and their results were as follows. ● Heating to 80 °C with Benedict’s solution gave a green colour. ● Adding Biuret solution gave a purple colour. ● Adding iodine solution gave an orange colour. ● Boiling with acid, followed by neutralisation, then heating to 80 °C with Benedict’s solution gave a brick red colour. Which conclusion about these results is correct? A only protein and reducing sugar present B only protein and non-reducing sugar present C only protein, reducing sugar and non-reducing sugar present D only starch, protein and sugar present

1 marks

Answer: C

This question in 9700/13 Oct/Nov 2017

Q169 · The diagrams show four monosaccharides with the formula C6H12O6 9700/13 Oct/Nov 2017

7 The diagrams show four monosaccharides with the formula C6H12O6. 1 2 3 4 CH2OH CH2OH CH2OH CH2OH H O H H O OH H O H H O H H H H H OH H OH H H H OH HO HO OH HO H HO OH HO OH H OH H OH OH OH H H Which diagrams show glucose molecules? A 1 and 2 B 1 and 3 C 2 and 3 D 3 and 4

1 marks

Answer: A

This question in 9700/13 Oct/Nov 2017

Q170 · Which bonds will be broken when a molecule of glycogen is broken down? 9700/13 Oct/Nov 2017

8 Which bonds will be broken when a molecule of glycogen is broken down? 1 α-1, 4 2 β-1, 4 3 α-1, 6 4 β-1, 6 A 1, 2 and 3 B 1 and 3 only C 2, 3 and 4 D 2 and 4 only

1 marks

Answer: B

This question in 9700/13 Oct/Nov 2017

Q171 · The diagrams show four fatty acids, each with a chain of 18 carbon atoms 9700/13 Oct/Nov 2017

11 The diagrams show four fatty acids, each with a chain of 18 carbon atoms. Which fatty acid, as part of a phospholipid molecule, would contribute most to the fluidity of a cell surface membrane? COOH A COOH B COOH C COOH D

1 marks

Answer: D

This question in 9700/13 Oct/Nov 2017

Q172 · A student wrote these statements about polysaccharides 9700/12 Feb/March 2018

8 A student wrote these statements about polysaccharides. 1 Amylose is formed from condensation reactions between β-glucose monomers. 2 Branches in amylopectin molecules form between carbon atoms 1 and 4 on α-glucose molecules. 3 In unbranched β-glucose chains, each monomer is rotated 180° relative to its adjacent monomer. Which of these statements are correct? A 1 and 2 B 1 only C 2 and 3 D 3 only

1 marks

Answer: D

This question in 9700/12 Feb/March 2018

Q173 · Sugars with a ring structure can also have a linear structure 9700/12 Feb/March 2018

10 Sugars with a ring structure can also have a linear structure. Which sugar molecules could be represented by the linear structure shown in the diagram? H O C H C OH HO C H H C OH H C OH CH2OH A α-glucose, deoxyribose and ribose B α-glucose only C deoxyribose and ribose only D deoxyribose only

1 marks

Answer: B

This question in 9700/12 Feb/March 2018

Q174 · When hydrolysed, which molecules have products containing a carboxyl group? 9700/12 Feb/March 2018

12 When hydrolysed, which molecules have products containing a carboxyl group? 1 phospholipids 2 polysaccharides 3 proteins A 1 and 2 B 1 and 3 C 2 and 3 D 3 only

1 marks

Answer: B

This question in 9700/12 Feb/March 2018

Q175 · What is the general formula for amylose? 9700/11 May/June 2018

6 What is the general formula for amylose? A (C5H10O5)n B (C5H10O6)n C (C6H10O5)n D (C6H12O6)n

1 marks

Answer: C

This question in 9700/11 May/June 2018

Q176 · The diagram shows relationships between some important molecules and bonds 9700/11 May/June 2018

7 The diagram shows relationships between some important molecules and bonds. 1 peptide glycosidic 3 ester 2 triglyceride cellulose vegetable oil amylopectin What is represented by circles numbered 1, 2 and 3? 1 2 3 A bonds formed carbohydrates lipids by condensation B bonds formed lipids carbohydrates by condensation C bonds formed carbohydrates lipids by hydrolysis D bonds formed lipids carbohydrates by hydrolysis

1 marks

Answer: A

This question in 9700/11 May/June 2018

Q177 · In unsaturated lipid molecules, where are double bonds located? 9700/11 May/June 2018

8 In unsaturated lipid molecules, where are double bonds located? A between fatty acids and glycerol B within fatty acids and within glycerol C within fatty acids only D within glycerol only

1 marks

Answer: C

This question in 9700/11 May/June 2018

Q178 · Phospholipids and triglycerides are important biological molecules 9700/11 May/June 2018

9 Phospholipids and triglycerides are important biological molecules. Which properties are correct for these molecules? non-polar partially hydrophobic A phospholipid phospholipid B phospholipid triglyceride C triglyceride phospholipid D triglyceride triglyceride

1 marks

Answer: C

This question in 9700/11 May/June 2018

Q179 · The diagram shows part of a carbohydrate molecule formed by glucose 9700/12 May/June 2018

7 The diagram shows part of a carbohydrate molecule formed by glucose. What is the name of the molecule? A amylose B cellulose C glycogen D starch

1 marks

Answer: C

This question in 9700/12 May/June 2018

Q180 · The diagram shows the relationship between some biological molecules 9700/12 May/June 2018

8 The diagram shows the relationship between some biological molecules. 1 2 3 4 5 Which row is correct? 1 2 3 4 5 A α-glucose carbohydrate sucrose monomer fructose B cellulose polymer starch carbohydrate amylase C fructose reducing sugar β-glucose monomer amino acid D haemoglobin protein amylose polymer cellulose

1 marks

Answer: C

This question in 9700/12 May/June 2018

Q181 · Which diagram shows the reaction that occurs to join two of the monomers that form… 9700/12 May/June 2018

9 Which diagram shows the reaction that occurs to join two of the monomers that form cellulose? C C C C H C O H H C O H H C O H H C O H A C C C C C C O C C HO C C OH HO C C OH HO C C C C OH H2O H2O C C C C H C O OH H C O OH H C O C O OH B C C C C C C C C HO C C H HO C C H HO C C H HO C C H H2O C C H C O H HO C C OH H C O C C OH C C C C C C C C C HO C C OH H C O H HO C C OH H C O H C C H2O C C H C O O H HO C C H H C O C C H D C C C C C C O C C HO C C H H C O OH HO C C H H C O OH C C

1 marks

Answer: D

This question in 9700/12 May/June 2018

Q182 · Which molecules contain C=O bonds? 9700/12 May/June 2018

10 Which molecules contain C=O bonds? 1 amino acids 2 fatty acids 3 glycerol A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: B

This question in 9700/12 May/June 2018

Q183 · Solutions of three biological molecules are tested for sugars 9700/13 May/June 2018

7 Solutions of three biological molecules are tested for sugars. The table shows the colours of the solutions after testing. boiled with hydrochloric acid, heated with Benedict’s solution neutralised, then heated with solution Benedict’s solution 1 blue orange 2 green green 3 orange red Which solutions contained glucose before testing? A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: D

This question in 9700/13 May/June 2018

Q184 · A solution containing equal masses of amylose and amylopectin is completely hydrolysed 9700/13 May/June 2018

8 A solution containing equal masses of amylose and amylopectin is completely hydrolysed. Which molecules will be found after the hydrolysis? A α-glucose only B β-glucose only C equal masses of α-glucose and β-glucose D more α-glucose than β-glucose

1 marks

Answer: A

This question in 9700/13 May/June 2018

Q185 · Which molecules contain the following bonds? 9700/13 May/June 2018

9 Which molecules contain the following bonds? ester hydrogen disulfide A amylase haemoglobin catalase B glycerol glycogen collagen C lipids amylopectin amylose D phospholipids cellulose antibodies

1 marks

Answer: D

This question in 9700/13 May/June 2018

Q186 · Which feature of phospholipids enables a bilayer to form? 9700/13 May/June 2018

10 Which feature of phospholipids enables a bilayer to form? A They are insoluble in water. B They are polar molecules. C They have hydrophobic and hydrophilic components. D They may contain saturated or unsaturated fatty acids.

1 marks

Answer: C

This question in 9700/13 May/June 2018

Q187 · A glycosidic bond is broken and two monosaccharides are formed during a positive test for… 9700/11 Oct/Nov 2018

7 A glycosidic bond is broken and two monosaccharides are formed during a positive test for a non-reducing sugar. Which row identifies the catalyst and reactants in this process? catalyst reactants A hydrochloric acid fructose and glucose B hydrochloric acid sucrose and water C sucrase enzyme fructose and glucose D sucrase enzyme sucrose and water

1 marks

Answer: B

This question in 9700/11 Oct/Nov 2018

Q188 · Which pair of statements are correct? 9700/11 Oct/Nov 2018

8 Which pair of statements are correct? A Carbon and oxygen occur in a ratio of 2 : 1 in carbohydrates. Triglycerides are soluble in water. B Glycolipids are found in all cell surface membranes. Carbohydrates are stored as starch in plants. C Phospholipids all have two saturated hydrocarbon chains. Polysaccharides are polymers. D Water is released during the formation of a glycosidic bond. Phospholipids all have three ester bonds.

1 marks

Answer: B

This question in 9700/11 Oct/Nov 2018

Q189 · What is the general formula for cellulose? 9700/11 Oct/Nov 2018

9 What is the general formula for cellulose? A (C5H10O5)n B (C5H10O6)n C (C6H10O5)n D (C6H12O6)n

1 marks

Answer: C

This question in 9700/11 Oct/Nov 2018

Q190 · A triglyceride consists of glycerol and three different fatty acids, linoleic acid (L)… 9700/11 Oct/Nov 2018

10 A triglyceride consists of glycerol and three different fatty acids, linoleic acid (L), oleic acid (O) and palmitic acid (P). The diagram shows one possible arrangement of the fatty acids L, O and P in the molecule. L glycerol O P What is the total number of different arrangements of the fatty acids in this triglyceride? A 3 B 4 C 5 D 9

1 marks

Answer: A

This question in 9700/11 Oct/Nov 2018

Q191 · A sample of a solution was tested for reducing sugar and the result was negative 9700/12 Oct/Nov 2018

7 A sample of a solution was tested for reducing sugar and the result was negative. Another sample of the same solution was then tested for non-reducing sugar and the result was positive. Which step in the test for non-reducing sugar breaks the glycosidic bonds? A addition of Benedict’s reagent B addition of sodium hydroxide C boiling with hydrochloric acid D heating to 80 °C

1 marks

Answer: C

This question in 9700/12 Oct/Nov 2018

Q192 · Which row correctly identifies three polysaccharides α-glucose α-glucose β-glucose… 9700/12 Oct/Nov 2018

8 Which row correctly identifies three polysaccharides α-glucose α-glucose β-glucose straight chain branching chain straight chain A amylose amylopectin cellulose B amylose glycogen amylopectin C glycogen amylose amylopectin D glycogen amylose cellulose

1 marks

Answer: A

This question in 9700/12 Oct/Nov 2018

Q193 · Which row describes a triglyceride? 9700/12 Oct/Nov 2018

9 Which row describes a triglyceride? hydrophobic nso in A Jv Jv key B v x ¥ = correct Cc x v X = not correct D x x

1 marks

Answer: B

This question in 9700/12 Oct/Nov 2018

Q194 · Which words correctly complete the description of amylose? 9700/13 Oct/Nov 2018

8 Which words correctly complete the description of amylose? The ««1«« amylose is a ««2«« made up of ««3«« of the ««4«« glucose. 1 2 3 4 A macromolecule monomer polymers disaccharide B macromolecule monomer polymers monosaccharide C polysaccharide polymer monomers disaccharide D polysaccharide polymer monomers monosaccharide

1 marks

Answer: D

This question in 9700/13 Oct/Nov 2018

Q195 · Which statements about glycosidic bonds are correct? 9700/13 Oct/Nov 2018

9 Which statements about glycosidic bonds are correct? 1 They occur by condensation reactions between the OH groups of two molecules. 2 They occur only between glucose molecules. 3 The bonds can only be formed between carbon 1 and carbon 4 or carbon 1 and carbon 6 of adjacent molecules. 4 Hydrolysis of the bonds releases energy. A 1, 2 and 3 B 1 and 4 C 2 and 4 D 3 and 4

1 marks

Answer: B

This question in 9700/13 Oct/Nov 2018

Q196 · What is the general formula for glycogen? 9700/13 Oct/Nov 2018

10 What is the general formula for glycogen? A (C5H10O5)n B (C5H10O6)n C (C6H10O5)n D (C6H12O6)n

1 marks

Answer: C

This question in 9700/13 Oct/Nov 2018

Q197 · Which statements are correct? 9700/13 Oct/Nov 2018

11 Which statements are correct? 1 In a triglyceride molecule the bonds between the fatty acids and the glycerol molecule are called ester bonds. 2 Triglycerides are formed by a condensation reaction between the hydroxyl group of a fatty acid molecule and one of the carboxyl groups of the glycerol molecule. 3 Triglycerides are insoluble in water because the fatty acid carbon chain is non-polar. A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: C

This question in 9700/13 Oct/Nov 2018

Q198 · The diagram shows a molecule of three hexose sugars 9700/12 Feb/March 2019

8 The diagram shows a molecule of three hexose sugars. CH2OH CH2OH CH2OH O C O C O H H H OH OH H H C C C C C C OH H OH H H OH HO OH HO H H CH2OH C C C C C C H OH H OH OH H 1 2 3 Which row correctly shows examples of carbohydrates in which these three hexose sugars occur? sucrose cellulose amylopectin A 1 2 3 B 1 3 2 C 2 3 1 D 3 2 1

1 marks

Answer: D

This question in 9700/12 Feb/March 2019

Q199 · Which feature of glycogen distinguishes glycogen from starch? 9700/12 Feb/March 2019

9 Which feature of glycogen distinguishes glycogen from starch? A All glycogen molecules are highly branched. B All glycogen molecules are polysaccharides. C All glycogen molecules contain α-glucose. D All glycogen molecules contain 1,4-glycosidic bonds.

1 marks

Answer: A

This question in 9700/12 Feb/March 2019

Q200 · A student wrote four statements about what happens during hydrolysis of a carbohydrate 9700/12 Feb/March 2019

10 A student wrote four statements about what happens during hydrolysis of a carbohydrate. 1 Disaccharides are formed from monosaccharides. 2 Glycosidic bonds are broken. 3 Molecules of water are released. 4 Monosaccharides can be formed. Which statements are correct? A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

1 marks

Answer: C

This question in 9700/12 Feb/March 2019

Q201 · The table compares three molecules, X, Y and Z, which contain the elements carbon… 9700/12 Feb/March 2019

11 The table compares three molecules, X, Y and Z, which contain the elements carbon, hydrogen and oxygen only. The percentage of carbon, hydrogen and oxygen atoms in each molecule is shown. molecule % carbon % hydrogen % oxygen X 25.0 50.0 25.0 Y 28.5 47.7 23.8 Z 34.6 61.6 3.8 Which row correctly identifies molecules X, Y and Z? molecule X Y Z A monosaccharide disaccharide polysaccharide B monosaccharide polysaccharide triglyceride C polysaccharide triglyceride monosaccharide D triglyceride monosaccharide polysaccharide

1 marks

Answer: B

This question in 9700/12 Feb/March 2019

Q202 · Which statements about the differences between phospholipids and triglycerides are… 9700/12 Feb/March 2019

12 Which statements about the differences between phospholipids and triglycerides are correct? 1 Phospholipids have hydrophobic regions but triglycerides do not. 2 The fatty acids in a phospholipid are always saturated but in a triglyceride they may be saturated or unsaturated. 3 Phospholipids are polar molecules but triglycerides are non-polar. A 1 and 2 B 1 only C 2 and 3 D 3 only

1 marks

Answer: D

This question in 9700/12 Feb/March 2019

Q203 · The diagram shows three hexose sugars 9700/11 May/June 2019

9 The diagram shows three hexose sugars. CH2OH CH2OH CH2OH O C O C O H H H OH OH H H C C C C C C OH H OH H H OH HO OH HO H H CH2OH C C C C C C H OH H OH OH H 1 2 3 Which row correctly shows examples of carbohydrates in which these three hexose sugars occur? sucrose cellulose starch A 1 2 3 B 1 3 2 C 2 3 1 D 3 2 1

1 marks

Answer: D

This question in 9700/11 May/June 2019

Q204 · What can occur during condensation of carbohydrates? 9700/11 May/June 2019

10 What can occur during condensation of carbohydrates? A a disaccharide is produced from monosaccharides B glycosidic bonds are broken C molecules of water are used up D monosaccharides are produced

1 marks

Answer: A

This question in 9700/11 May/June 2019

Q205 · What is true about triglycerides? 9700/11 May/June 2019

11 What is true about triglycerides? hydrophobic insoluble in alcohol A J Jv key B v x ¥ = correct Cc x v X = not correct D x x

1 marks

Answer: B

This question in 9700/11 May/June 2019

Q206 · After boiling a sample of milk with Benedict’s solution, a yellow colour is observed 9700/12 May/June 2019

5 After boiling a sample of milk with Benedict’s solution, a yellow colour is observed. Which conclusion about the sample of milk is correct? A Reducing sugars are not present. B Reducing sugars are present. C There is a high concentration of fructose. D There is a low concentration of sucrose.

1 marks

Answer: B

This question in 9700/12 May/June 2019

Q207 · Which of the statements about polysaccharides can be used to describe amylose and… 9700/12 May/June 2019

6 Which of the statements about polysaccharides can be used to describe amylose and cellulose? 1 contains 1,4 glycosidic bonds 2 contains 1,6 glycosidic bonds 3 polymer of glucose A 1 and 2 B 1 and 3 C 1 only D 2 and 3

1 marks

Answer: B

This question in 9700/12 May/June 2019

Q208 · The fatty acids elaidic acid and oleic acid have exactly the same structural formulae… 9700/12 May/June 2019

12 The fatty acids elaidic acid and oleic acid have exactly the same structural formulae, with one double bond in the chain. However, the shapes of the chains are different, as shown in the diagram. elaidic acid oleic acid COOH COOH Which row shows the effect of the presence of these fatty acids on the structure and behaviour of a cell surface membrane? elaidic acid oleic acid A does not fit closely with other fits closely with other fatty fatty acids so that the membrane acids so that the membrane is is less fluid at high temperatures less fluid at low temperatures B does not fit closely with other fits closely with other fatty fatty acids so that the membrane acids so that the membrane is is more fluid at low temperatures less fluid at low temperatures C fits closely with other fatty does not fit closely with other acids so that the membrane is fatty acids so that the membrane less fluid at high temperatures is more fluid at low temperatures D fits closely with other fatty does not fit closely with other acids so that the membrane is fatty acids so that the membrane more fluid at low temperatures is more fluid at high temperatures

1 marks

Answer: C

This question in 9700/12 May/June 2019

Q209 · The diagram shows three hexose sugars 9700/13 May/June 2019

8 The diagram shows three hexose sugars. CH2OH CH2OH CH2OH O C O C O H H H OH OH H H C C C C C C OH H OH H H OH HO OH HO H H CH2OH C C C C C C H OH H OH OH H 1 2 3 Which row correctly shows examples of carbohydrates in which these three hexose sugars occur? sucrose cellulose amylose A 1 2 3 B 1 3 2 C 2 3 1 D 3 2 1

1 marks

Answer: D

This question in 9700/13 May/June 2019

Q210 · What can occur as a result of a condensation reaction? 9700/13 May/June 2019

9 What can occur as a result of a condensation reaction? 1 A disaccharide is formed. 2 A glycosidic bond is broken. 3 A molecule of water is produced. 4 Two monosaccharides join together. A 1, 2 and 3 B 1, 2 and 4 C 1, 3 and 4 D 2, 3 and 4

1 marks

Answer: C

This question in 9700/13 May/June 2019

Q211 · The diagram shows some relationships between features of carbohydrates 9700/13 May/June 2019

10 The diagram shows some relationships between features of carbohydrates. α-glucose 1,4 bonds 1 4 3 2 branched Which row correctly matches the carbohydrate with some of its features? 1 2 3 4 A amylopectin sucrose glycogen cellulose B amylose glycogen amylopectin cellulose C cellulose amylopectin glycogen sucrose D glycogen cellulose amylose amylopectin

1 marks

Answer: B

This question in 9700/13 May/June 2019

Q212 · Which row describes a triglyceride? 9700/13 May/June 2019

11 Which row describes a triglyceride? v Jv key v Xx ¥ = correct x v X = not correct x x

1 marks

Answer: D

This question in 9700/13 May/June 2019

Q213 · The diagram shows three triglycerides, X, Y and Z 9700/13 May/June 2019

12 The diagram shows three triglycerides, X, Y and Z. O H2COC O X HCOC O H2COC O H2COC O Y HCOC O H2COC O H2COC O Z HCOC O H2COC What is correct for these triglycerides? contains contains contains more saturated unsaturated than two different fatty acids fatty acids fatty acids A X, Y and Z X and Y X and Y B X, Y and Z Z X and Y C X and Y X, Y and Z X, Y and Z D Z X and Y X, Y and Z

1 marks

Answer: A

This question in 9700/13 May/June 2019

Q214 · The diagram shows the monosaccharide xylose 9700/11 Oct/Nov 2019

6 The diagram shows the monosaccharide xylose. H H C O OH H C H C OH HO C C H H OH Many xylose monomers can be joined by glycosidic bonds to form a polysaccharide which is found in plant cell walls. Which diagram shows the formation of a glycosidic bond between two xylose monomers? H H H C O OH H C O OH H H A C H C C H C OH OH HO C C H HO C C H H OH H OH H H H C O OH H C O OH H H B C H C C H C OH OH HO C C H HO C C H H OH H OH H H OH H C O OH HO C C H H OH H C C C C C OH H H HO C C H H C O OH H OH H H H OH H C O OH HO C C H H OH H D C C C C OH H H HO C C H H C O OH H OH H

1 marks

Answer: D

This question in 9700/11 Oct/Nov 2019

Q215 · Which molecules are monomers? 9700/11 Oct/Nov 2019

8 Which molecules are monomers? 1 ribose 2 glucose 3 deoxyribose 4 sucrose A 1, 2 and 3 B 1, 2 and 4 C 1, 3 and 4 D 2, 3 and 4

1 marks

Answer: A

This question in 9700/11 Oct/Nov 2019

Q216 · Which molecules have properties that are dependent on hydrogen bonds? 9700/11 Oct/Nov 2019

9 Which molecules have properties that are dependent on hydrogen bonds? 1 cellulose 2 glycogen 3 haemoglobin 4 water A 1, 2 and 3 B 1, 2 and 4 C 1, 3 and 4 D 2, 3 and 4

1 marks

Answer: C

This question in 9700/11 Oct/Nov 2019

Q217 · Some features of triglycerides are listed 9700/11 Oct/Nov 2019

10 Some features of triglycerides are listed. 1 can be liquid or solid at room temperature 2 contains a high proportion of carbon–hydrogen bonds 3 insoluble in water 4 less dense than water Which of these features make triglycerides suitable energy stores? A 1 and 2 B 1 and 4 C 2, 3 and 4 D 2 and 3 only

1 marks

Answer: D

This question in 9700/11 Oct/Nov 2019

Q218 · Some foods contain hydrogenated vegetable oils 9700/11 Oct/Nov 2019

11 Some foods contain hydrogenated vegetable oils. These are unsaturated fats that have been converted to saturated fats. Which property of the fats will have changed? A Their hydrocarbon chains will fit together more closely. B Their solubility in water will increase. C They will have more double bonds in their molecules. D They will remain liquid at room temperature.

1 marks

Answer: A

This question in 9700/11 Oct/Nov 2019

Q219 · Which rows show the chemical groups present in the biological molecules listed? 9700/12 Oct/Nov 2019

9 Which rows show the chemical groups present in the biological molecules listed? biological presence of carboxyl presence of two or more molecule (COOH) groups hydroxyl (OH) groups 1 amino acid yes no 2 β-glucose no yes 3 glycerol no no 4 fatty acid yes no A 1, 2 and 3 B 1, 2 and 4 C 1, 3 and 4 D 2, 3 and 4

1 marks

Answer: B

This question in 9700/12 Oct/Nov 2019

Q220 · The diagram shows the formation of a biological macromolecule 9700/12 Oct/Nov 2019

10 The diagram shows the formation of a biological macromolecule. O O OH C (CH2)16 CH3 CH2 O C (CH2)16 CH3 CH2 OH O O CH2 OH + → + 3H2O OH C (CH2)16 CH3 CH2 O C (CH2)16 CH3 CH2 OH O O OH C (CH2)16 CH3 CH2 O C (CH2)16 CH3 Which type of bonds are formed in the macromolecule product? A ester bonds B glycosidic bonds C hydrogen bonds D peptide bonds

1 marks

Answer: A

This question in 9700/12 Oct/Nov 2019

Q221 · What occurs during the formation of a glycosidic bond between two α-glucose molecules? 9700/13 Oct/Nov 2019

7 What occurs during the formation of a glycosidic bond between two α-glucose molecules? A a 1, 4 bond is always formed B a hydrogen bond is always formed C a molecule of water is always formed D a hydroxyl (OH) group is always formed

1 marks

Answer: C

This question in 9700/13 Oct/Nov 2019

Q222 · What is the maximum number of condensation reactions that occur when a triglyceride is… 9700/13 Oct/Nov 2019

8 What is the maximum number of condensation reactions that occur when a triglyceride is synthesized? A 1 B 2 C 3 D 4

1 marks

Answer: C

This question in 9700/13 Oct/Nov 2019

Q223 · The molecule shown is a polymer of reducing sugars 9700/12 Feb/March 2020

7 The molecule shown is a polymer of reducing sugars. CH2OH CH2OH CH2OH CH2OH O O O O OH OH OH OH O O O HO OH OH OH OH OH Which procedures could be carried out to show that this molecule is a polymer of reducing sugars? 1 Add hydrolytic enzyme and then heat with Benedict’s solution. 2 Dissolve in water, neutralise and then heat with Benedict’s solution. 3 Boil with hydrochloric acid, neutralise and then heat with Benedict’s solution. A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: C

This question in 9700/12 Feb/March 2020

Q224 · Which statement about biological molecules is correct? 9700/12 Feb/March 2020

8 Which statement about biological molecules is correct? A Amylopectin, amylose and cellulose are all polymers. B Amylose, cellulose and glucose are all macromolecules. C Cellulose, glucose and starch are all monomers. D Sucrose, starch and amylopectin are all polysaccharides.

1 marks

Answer: A

This question in 9700/12 Feb/March 2020

Q225 · Sugars with a ring structure can also have a linear structure 9700/12 Feb/March 2020

9 Sugars with a ring structure can also have a linear structure. H C O H C OH HO C H H C OH H C OH CH2OH Which of these sugar molecules could be represented by the linear structure in the diagram? 1 glucose 2 ribose 3 sucrose A 1 and 2 B 2 and 3 C 1 only D 2 only

1 marks

Answer: C

This question in 9700/12 Feb/March 2020

Q226 · Which statements about phospholipids and triglycerides are correct? 9700/12 Feb/March 2020

10 Which statements about phospholipids and triglycerides are correct? 1 They both contain ester bonds. 2 They both have three fatty acid chains per molecule. 3 They both may have saturated and unsaturated fatty acid chains. 4 They are both used only as storage molecules. A 1, 2 and 3 B 1 and 3 only C 2, 3 and 4 D 2 and 4 only

1 marks

Answer: B

This question in 9700/12 Feb/March 2020

Q227 · Maltose and sucrose are disaccharides 9700/11 May/June 2020

7 Maltose and sucrose are disaccharides. Maltose is formed from two molecules of glucose, whilst sucrose is formed from fructose and glucose. Which row shows the molecular formulae of the two disaccharides? maltose sucrose A C12H22O11 C12H22O11 B C12H22O11 C12H24O12 C C12H24O12 C12H22O11 D C12H24O12 C12H24O12

1 marks

Answer: A

This question in 9700/11 May/June 2020

Q228 · The diagrams show short sections of some common polysaccharides and modified… 9700/11 May/June 2020

8 The diagrams show short sections of some common polysaccharides and modified polysaccharides. CH2OH H NHCOCH3 CH2OH H OH O O H O H H O H H OH H H OH H O OH H H O O OH H H O H H H H O O H NHCOCH3 CH2OH H OH CH2OH 1 2 CH2OH CH2OH O O H H H H H H O OH H O OH H O H OH H OH 3 The polysaccharides can be described as: ● F is composed of β-glucose monomers with 1,4 glycosidic bonds ● G is composed of α-glucose monomers with 1,4 glycosidic bonds ● H is composed of N-acetylglucosamine monomers with β-1,4 glycosidic bonds. Which row correctly matches the numbered diagrams to the descriptions of the polysaccharides? polysaccharide polysaccharide polysaccharide F G H A 2 1 3 B 2 3 1 C 3 1 2 D 3 2 1

1 marks

Answer: B

This question in 9700/11 May/June 2020

Q229 · Which molecules contain at least two double bonds? 9700/11 May/June 2020

9 Which molecules contain at least two double bonds? 1 unsaturated fatty acid 2 collagen 3 haemoglobin A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: A

This question in 9700/11 May/June 2020

Q230 · The diagrams show three hexoses 9700/12 May/June 2020

8 The diagrams show three hexoses. CH2OH CH2OH O C O C O H H HOH2C OH H OH H H C C C C C C OH H H OH OH H HO OH H CH2OH HO H C C C C C C H OH OH H H OH 1 2 3 In which carbohydrates do these three hexoses occur? sucrose cellulose glycogen A 1 2 3 B 1 3 2 C 2 3 1 D 3 2 1

1 marks

Answer: C

This question in 9700/12 May/June 2020

Q231 · The diagram shows part of the chemical structure of a naturally occurring polysaccharide 9700/12 May/June 2020

9 The diagram shows part of the chemical structure of a naturally occurring polysaccharide. COOH CH2OH COOH CH2OH O O O O O O O O O O OH O OH HO HO HO OH HN CH3 OH HN CH3 O O What types of glycosidic bonds are present? A α-1,3 and α-1,4 B α-1,4 and α-1,6 C β-1,3 and β-1,4 D β-1,4 and β-1,6

1 marks

Answer: C

This question in 9700/12 May/June 2020

Q232 · What is the maximum number of water molecules produced when a triglyceride is synthesised? 9700/12 May/June 2020

10 What is the maximum number of water molecules produced when a triglyceride is synthesised? A 3 B 2 C 1 D 0

1 marks

Answer: A

This question in 9700/12 May/June 2020

Q233 · The colour of a positive Benedict’s test is due to the formation of copper oxide 9700/13 May/June 2020

6 The colour of a positive Benedict’s test is due to the formation of copper oxide. The mass of copper oxide is proportional to the mass of reducing sugar present. Samples of fruit juice were tested for the presence of reducing sugars and non-reducing sugars using the Benedict’s test. The table shows the mass of copper oxide after boiling with Benedict’s solution and after acid hydrolysis and boiling with Benedict’s solution. Which sample contained the most non-reducing sugar? mass of copper oxide / mg after boiling with after acid hydrolysis and Benedict’s solution boiling with Benedict’s solution A 20 20 B 30 45 C 50 55 D 65 75

1 marks

Answer: B

This question in 9700/13 May/June 2020

Q234 · Which polysaccharides contain 1, 4 and 1, 6 glycosidic bonds? 9700/13 May/June 2020

7 Which polysaccharides contain 1, 4 and 1, 6 glycosidic bonds? 1 amylopectin 2 amylose 3 cellulose 4 glycogen A 1 and 3 B 1 and 4 C 2 and 3 D 4 only

1 marks

Answer: B

This question in 9700/13 May/June 2020

Q235 · Which molecules contain at least two double bonds? 9700/13 May/June 2020

11 Which molecules contain at least two double bonds? 1 saturated fatty acid 2 collagen 3 haemoglobin A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: D

This question in 9700/13 May/June 2020

Q236 · A student carried out the Benedict’s test on two different types of milk, X and Y 9700/11 Oct/Nov 2020

7 A student carried out the Benedict’s test on two different types of milk, X and Y. A sample of each type of milk was heated to 100 C in a water-bath with Benedict’s solution and the time taken for the first appearance of a colour change was recorded. The results are shown in the table. time for first appearance type of of a colour change with milk Benedict’s solution / s X 13 Y 26 Which row shows the biological molecule the student detected in each sample of milk and the sample of milk with the highest concentration of this biological molecule? biological sample of milk with the molecule present in highest concentration of each sample of milk this biological molecule A glucose X B glucose Y C reducing sugar X D reducing sugar Y

1 marks

Answer: C

This question in 9700/11 Oct/Nov 2020

Q237 · The diagram shows the structure of a monomer 9700/11 Oct/Nov 2020

8 The diagram shows the structure of a monomer. CH2OH O H H H OH H HO OH H OH Which molecules contain this monomer? amylopectin A C B glycogen D sucrose

1 marks

Answer: B

This question in 9700/11 Oct/Nov 2020

Q238 · Which molecules are formed by condensation which involves a carboxyl group? 9700/11 Oct/Nov 2020

9 Which molecules are formed by condensation which involves a carboxyl group? A amylopectin, collagen, triglyceride, sucrose B amylopectin, collagen, triglyceride C amylopectin, -globin, sucrose D collagen, -globin, triglyceride

1 marks

Answer: D

This question in 9700/11 Oct/Nov 2020

Q239 · Which row correctly matches the function with the structural features of cellulose… 9700/11 Oct/Nov 2020

10 Which row correctly matches the function with the structural features of cellulose, collagen, glycogen or triglyceride? structure molecules held molecule function fibrous together by branched chains hydrogen bonds A cellulose support Jv Jv x triglyceride | energy source x x x B collagen strengthening Jv Jv x cellulose support Jv x v Cc collagen strengthening Jv Jv Jv glycogen storage x x Jv D glycogen storage x Jv Jv x Jv x triglyceride energy source key J/=correct X = not correct

1 marks

Answer: A

This question in 9700/11 Oct/Nov 2020

Q240 · Which row is correct for carbohydrates? 9700/13 Oct/Nov 2020

8 Which row is correct for carbohydrates? monomer polymer macromolecule A fructose amylose cellulose B glucose deoxyribose amylopectin C monosaccharide glycogen deoxyribose D sucrose starch glycogen

1 marks

Answer: A

This question in 9700/13 Oct/Nov 2020

Q241 · Which molecules contain 1,6 glycosidic bonds? 9700/13 Oct/Nov 2020

9 Which molecules contain 1,6 glycosidic bonds? 1 amylopectin 2 glycogen 3 starch A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: A

This question in 9700/13 Oct/Nov 2020

Q242 · Which row correctly shows the ratio of carbon atoms to hydrogen atoms for glucose, a… 9700/13 Oct/Nov 2020

10 Which row correctly shows the ratio of carbon atoms to hydrogen atoms for glucose, a saturated fatty acid and sucrose? ratio of carbon atoms to hydrogen atoms saturated fatty glucose sucrose acid A 1 : 2 1 : 2 1 : 1.8 B 1 : 2 4 : 1 1 : 2 C 2 : 1 1 : 4 2 : 1 D 2 : 1 2 : 1 1.8 : 1

1 marks

Answer: A

This question in 9700/13 Oct/Nov 2020

Q243 · Which row shows a correct comparison between a phospholipid molecule and a triglyceride… 9700/13 Oct/Nov 2020

11 Which row shows a correct comparison between a phospholipid molecule and a triglyceride molecule? phospholipid molecule triglyceride molecule A contains a hydrophobic phosphate group is a hydrophobic molecule B contains one glycerol molecule contains three glycerol molecules C fewer ester bonds more ester bonds D more fatty acids fewer fatty acids

1 marks

Answer: C

This question in 9700/13 Oct/Nov 2020

Q244 · Which diagram represents a molecule of -glucose? 9700/12 Feb/March 2021

8 Which diagram represents a molecule of -glucose? A B C D CH2OH CH2OH CH2OH CH2OH O O O OH HO O OH OH OH OH OH HO OH HO OH HO OH OH OH OH

1 marks

Answer: A

This question in 9700/12 Feb/March 2021

Q245 · Which statements about glycosidic bonds are correct? 9700/12 Feb/March 2021

9 Which statements about glycosidic bonds are correct? 1 Condensation between glucose and fructose uses water and forms sucrose. 2 Glycogen contains -1,4 glycosidic bonds and -1,6 glycosidic bonds formed by condensation. 3 The hydrolysis of amylopectin uses water to break glycosidic bonds and release -glucose. 4 Amylose contains -1,6 glycosidic bonds formed by condensation. A 1, 2 and 3 B 1, 3 and 4 C 2 and 3 only D 2 and 4

1 marks

Answer: C

This question in 9700/12 Feb/March 2021

Q246 · A triglyceride has … 1 … bonds formed by joining fatty acids to … 2 … 9700/12 Feb/March 2021

10 A triglyceride has … 1 … bonds formed by joining fatty acids to … 2 … . Which row correctly completes this sentence? 1 2 A ester glycine B hydrogen glycerol C ester glycerol D hydrogen glycine

1 marks

Answer: C

This question in 9700/12 Feb/March 2021

Q247 · A sample of food was heated with Benedict’s solution which changed colour to green 9700/11 May/June 2021

7 A sample of food was heated with Benedict’s solution which changed colour to green. A second sample of the same food was boiled with dilute hydrochloric acid and neutralised using sodium hydrogencarbonate. It was then heated with Benedict’s solution which changed colour to red. What did these results show? glucose present A reducing D non-reducing sugar present sugar present C B

1 marks

Answer: C

This question in 9700/11 May/June 2021

Q248 · Which pair of molecules only includes macromolecules that can be found in animal cells? 9700/11 May/June 2021

8 Which pair of molecules only includes macromolecules that can be found in animal cells? A amylase and amylopectin B collagen and glycogen C deoxyribose and starch D sucrose and haemoglobin

1 marks

Answer: B

This question in 9700/11 May/June 2021

Q249 · Homogalacturonan is a polysaccharide found in plant cell walls 9700/11 May/June 2021

9 Homogalacturonan is a polysaccharide found in plant cell walls. The diagram shows a molecule of the monomer used to form homogalacturonan. CO2H O HO H OH H H OH H OH A student studied the structure of this monomer and compared it with the structure of the monomer used to form cellulose. Which carbon atoms in the monomer in the diagram have hydroxyl groups arranged in different positions to those found in the cellulose monomer? A carbon one and carbon four B carbon one only C carbon three and carbon four D carbon three only

1 marks

Answer: A

This question in 9700/11 May/June 2021

Q250 · Which statement is correct for triglycerides and phospholipids? 9700/11 May/June 2021

10 Which statement is correct for triglycerides and phospholipids? A A phosphate group is joined to a glycerol molecule. B Hydrocarbon chains may be saturated or unsaturated. C They are polar molecules. D They contain three ester bonds.

1 marks

Answer: B

This question in 9700/11 May/June 2021

Q251 · Which row is correct for carbohydrates? 9700/12 May/June 2021

7 Which row is correct for carbohydrates? macromolecule monomer polymer A sucrose starch -glucose B glycogen sucrose starch C -glucose glycogen sucrose D starch -glucose glycogen

1 marks

Answer: D

This question in 9700/12 May/June 2021

Q252 · Which shows the correct general formula for glycogen? 9700/12 May/June 2021

8 Which shows the correct general formula for glycogen? A (C5H10O5)n B (C5H10O6)n C (C6H10O5)n D (C6H12O6)n

1 marks

Answer: C

This question in 9700/12 May/June 2021

Q253 · Chitin is a structural polysaccharide found in the hard, outer shells of animals such as… 9700/12 May/June 2021

9 Chitin is a structural polysaccharide found in the hard, outer shells of animals such as crabs. Chitin is made of chains of amino sugars that contain NH groups. The diagram shows two sugars in the chain of a chitin molecule. CH2OH H NHCOCH3 O H H O H OH H OH H H O O H H O H NHCOCH3 CH2OH Which polysaccharide is most like chitin? A amylopectin B amylose C cellulose D glycogen

1 marks

Answer: C

This question in 9700/12 May/June 2021

Q254 · Four fatty acids and their formulae are listed 9700/12 May/June 2021

10 Four fatty acids and their formulae are listed. caprylic acid CH3(CH2)6COOH lauric acid CH3(CH2)10COOH oleic acid CH3(CH2)7CH=CH(CH2)7COOH palmitoleic acid CH3(CH2)5CH=CH(CH2)7COOH Which fatty acids are saturated? A caprylic acid and lauric acid B caprylic acid and oleic acid C lauric acid and palmitoleic acid D oleic acid and palmitoleic acid

1 marks

Answer: A

This question in 9700/12 May/June 2021

Q255 · Which molecule contains the smallest number of hydrogen atoms? 9700/12 May/June 2021

11 Which molecule contains the smallest number of hydrogen atoms? A -glucose B glycine, an amino acid in which the R group is H C glycerol D a saturated fatty acid containing eight carbon atoms

1 marks

Answer: B

This question in 9700/12 May/June 2021

Q256 · Four solutions were tested for the presence of four different biological molecules 9700/13 May/June 2021

7 Four solutions were tested for the presence of four different biological molecules. The appearance of the solutions after each test are shown in the table. Benedict’s solution following acid Benedict’s biuret emulsion hydrolysis 1 blue blue purple cloudy 2 green blue purple clear 3 red green purple cloudy 4 yellow yellow blue clear Which solutions contained molecules with ester bonds? A 1, 2 and 3 B 1 and 3 only C 2, 3 and 4 D 2 and 4 only

1 marks

Answer: B

This question in 9700/13 May/June 2021

Q257 · The diagrams represent two monosaccharides with the same molecular formula (C6H12O6) 9700/13 May/June 2021

8 The diagrams represent two monosaccharides with the same molecular formula (C6H12O6). Both can exist in an alpha () or beta () form as shown. CH2OH CH2OH CH2OH CH2OH C O C O C O C O HO OH H OH HO H H H H H H H C C C C C C C C OH H OH H OH H OH H H H HO H H OH HO OH C C C C C C C C H OH H OH H OH H OH β-galactose β-glucose α-galactose α-glucose The diagram shows a lactose molecule formed by condensation between glucose and galactose. CH2OH CH2OH O O HO H OH H H O OH H OH H H H H H OH H OH Which molecules have condensed to form lactose? A -glucose and -galactose B -glucose and -galactose C -glucose and -galactose D -glucose and -galactose

1 marks

Answer: D

This question in 9700/13 May/June 2021

Q258 · One type of covalent bond between two monomers is shown 9700/13 May/June 2021

9 One type of covalent bond between two monomers is shown. CH2OH O H H H OH H ...O O CH2 H OH O H H H OH H ...O O... H OH Which molecules contain this type of covalent bond? A amylopectin, amylase, glycogen and starch B amylopectin, amylase and glycogen only C amylopectin, glycogen and starch only D amylase, glycogen and starch only

1 marks

Answer: C

This question in 9700/13 May/June 2021

Q259 · Which statements about carbohydrates and triglycerides are correct? 9700/13 May/June 2021

10 Which statements about carbohydrates and triglycerides are correct? 1 They form polymers. 2 They contain carbon, hydrogen and oxygen. 3 They are used as energy stores. A 1, 2 and 3 B 1 and 3 only C 1 only D 2 and 3 only

1 marks

Answer: D

This question in 9700/13 May/June 2021

Q260 · Which molecules contain at least three double bonds? 9700/13 May/June 2021

11 Which molecules contain at least three double bonds? A saturated fatty acid, collagen and haemoglobin B collagen and saturated fatty acid C haemoglobin and collagen D saturated fatty acid and haemoglobin

1 marks

Answer: C

This question in 9700/13 May/June 2021

Q261 · One molecule of X is formed by a single condensation reaction releasing one molecule of… 9700/11 Oct/Nov 2021

6 One molecule of X is formed by a single condensation reaction releasing one molecule of water. What is molecule X? A a disaccharide B a phospholipid C a polysaccharide D a triglyceride

1 marks

Answer: A

This question in 9700/11 Oct/Nov 2021

Q262 · The table shows some information about carbohydrate polymers 9700/11 Oct/Nov 2021

7 The table shows some information about carbohydrate polymers. Which row describes glycogen? a-1,4 a-1,6 idi lvcosidic shape of function of gIYCOSICIC glyco molecule molecule bonds bonds A v v branched storage key B v x helical storage v¥ = present Cc x Jv branched structural X = not present D x x helical structural

1 marks

Answer: A

This question in 9700/11 Oct/Nov 2021

Q263 · The diagrams show four phospholipid molecules 9700/11 Oct/Nov 2021

8 The diagrams show four phospholipid molecules. Which molecule could contribute most to the fluidity of a cell surface membrane? A B C D

1 marks

Answer: D

This question in 9700/11 Oct/Nov 2021

Q264 · Which general formula is correct for monosaccharides such as fructose? 9700/12 Oct/Nov 2021

8 Which general formula is correct for monosaccharides such as fructose? A (CHO)n B (CH2O)n C (CHO2)n D (C2HO)n

1 marks

Answer: B

This question in 9700/12 Oct/Nov 2021

Q265 · Which statements can be used to describe the structure of cellulose? 9700/12 Oct/Nov 2021

9 Which statements can be used to describe the structure of cellulose? 1 a polymer of glucose monomers linked by -1,4 glycosidic bonds 2 a polysaccharide of hexose monomers 3 an unbranched macromolecule made of -glucose monomers A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: A

This question in 9700/12 Oct/Nov 2021

Q266 · Complete hydrolysis of polysaccharides requires all the glycosidic bonds between the… 9700/12 Oct/Nov 2021

10 Complete hydrolysis of polysaccharides requires all the glycosidic bonds between the monomers to be broken. Enzyme X only breaks -1,4 glycosidic bonds. Which row shows how completely enzyme X can hydrolyse molecules of glycogen and amylose? glycogen amylose A + ++ key B ++ + – no hydrolysis C ++ – + some hydrolysis D – + ++ most hydrolysis

1 marks

Answer: A

This question in 9700/12 Oct/Nov 2021

Q267 · Which molecules contain at least two double bonds? 9700/12 Oct/Nov 2021

11 Which molecules contain at least two double bonds? A saturated fatty acid, collagen and haemoglobin B collagen and saturated fatty acid only C haemoglobin and collagen only D saturated fatty acid and haemoglobin only

1 marks

Answer: C

This question in 9700/12 Oct/Nov 2021

Q268 · Which polysaccharide is correctly described? 9700/13 Oct/Nov 2021

8 Which polysaccharide is correctly described? polysaccharide monomer biological role A amylopectin -glucose storage molecule in animals B amylose -glucose storage molecule in plants C cellulose -glucose structural molecule in plants D glycogen -glucose structural molecule in animals

1 marks

Answer: B

This question in 9700/13 Oct/Nov 2021

Q269 · Which formula represents a saturated fatty acid? 9700/13 Oct/Nov 2021

9 Which formula represents a saturated fatty acid? A C18H36O2 B C18H34O2 C C18H32O2 D C18H30O2

1 marks

Answer: A

This question in 9700/13 Oct/Nov 2021

Q270 · Which molecules always contain at least four double bonds? 9700/13 Oct/Nov 2021

10 Which molecules always contain at least four double bonds? A triglyceride, collagen and haemoglobin B collagen and triglyceride only C haemoglobin and collagen only D triglyceride and haemoglobin only

1 marks

Answer: C

This question in 9700/13 Oct/Nov 2021

Q271 · A student used Benedict’s solution to test a sample known to contain carbohydrate 9700/12 Feb/March 2022

7 A student used Benedict’s solution to test a sample known to contain carbohydrate. At the end of the test the solution was blue. Which carbohydrate could be present in the sample? A glucose B fructose C maltose D sucrose

1 marks

Answer: D

This question in 9700/12 Feb/March 2022

Q272 · Sugars with a ring structure can also have a linear structure 9700/12 Feb/March 2022

8 Sugars with a ring structure can also have a linear structure. H C O H C OH HO C H H C OH H C OH CH2OH Which sugar molecules could be represented by the linear structure in the diagram? 1 ribose 2 deoxyribose 3 glucose A 1 and 2 B 1 and 3 C 2 and 3 D 3 only

1 marks

Answer: D

This question in 9700/12 Feb/March 2022

Q273 · Which row matches each molecule to a type of bond that is present? 9700/12 Feb/March 2022

9 Which row matches each molecule to a type of bond that is present? ester bond hydrogen bond disulfide bond A amylase haemoglobin catalase B glycerol glycogen collagen C lipid amylopectin amylose D phospholipid cellulose antibody

1 marks

Answer: D

This question in 9700/12 Feb/March 2022

Q274 · Which row shows features of a carbohydrate polymer found inside animal cells? 9700/12 Feb/March 2022

10 Which row shows features of a carbohydrate polymer found inside animal cells? a-1,4 a-1,6 shape of glycosidic glycosidic molecule bonds bonds A Jv v branched key B J x helical J/ = present Cc x v branched | X = absent D x x helical

1 marks

Answer: A

This question in 9700/12 Feb/March 2022

Q275 · The statements describe the structure of a polysaccharide found in the cell walls of… 9700/12 Feb/March 2022

11 The statements describe the structure of a polysaccharide found in the cell walls of certain plants. 1 The polysaccharide is composed of two different monosaccharides. 2 The monosaccharides are joined by 1,4 glycosidic bonds. 3 The polysaccharide contains pentose sugars. Which statements are also true for cellulose? A 1 and 2 B 1 and 3 C 2 and 3 D 2 only

1 marks

Answer: D

This question in 9700/12 Feb/March 2022

Q276 · The general formula for a saturated fatty acid is CnH2nO2 9700/12 Feb/March 2022

12 The general formula for a saturated fatty acid is CnH2nO2. Which of these fatty acids are unsaturated? 1 C10H19COOH 2 C15H31COOH 3 C17H31COOH 4 C18H32COOH A 1, 2 and 3 B 1, 2 and 4 C 1, 3 and 4 D 2, 3 and 4

1 marks

Answer: C

This question in 9700/12 Feb/March 2022

Q277 · What enables triglycerides to perform their functions in living organisms? 9700/12 Feb/March 2022

13 What enables triglycerides to perform their functions in living organisms? 1 Triglycerides have hydrophobic and hydrophilic regions. 2 Triglycerides have a high ratio of carbon–hydrogen bonds to carbon atoms. 3 Hydrolysis of triglycerides releases metabolic water. A 1 and 2 B 1 and 3 C 2 and 3 D 2 only

1 marks

Answer: D

This question in 9700/12 Feb/March 2022

Q278 · Samples of glucose, sucrose, and a mixture of glucose and sucrose were divided into two… 9700/11 May/June 2022

6 Samples of glucose, sucrose, and a mixture of glucose and sucrose were divided into two halves M and N. M was then tested with Benedict’s solution. N was boiled with dilute hydrochloric acid, neutralised and then tested with Benedict’s solution. The colour of the solution was compared to colour standards. Which table identifies the correct colour changes for these samples? A B sample M N sample M N glucose blue blue glucose yellow yellow sucrose blue yellow sucrose blue yellow mixture blue yellow mixture blue yellow C D sample M N sample M N glucose yellow yellow glucose yellow red sucrose blue yellow sucrose blue red mixture yellow red mixture yellow red

1 marks

Answer: C

This question in 9700/11 May/June 2022

Q279 · Which molecules contain 1,4-glycosidic bonds? 9700/11 May/June 2022

7 Which molecules contain 1,4-glycosidic bonds? amylose A D B C cellulose glycogen

1 marks

Answer: C

This question in 9700/11 May/June 2022

Q280 · The diagram shows three triglycerides, X, Y and Z 9700/11 May/June 2022

8 The diagram shows three triglycerides, X, Y and Z. O H2COC O X HCOC O H2COC O H2COC O Y HCOC O H2COC O H2COC O Z HCOC O H2COC Which row is correct for these triglycerides? contains contains contains more saturated unsaturated than two different fatty acids fatty acids fatty acids A X, Y and Z X and Y X and Y B X, Y and Z Z X and Y C X and Y X, Y and Z X, Y and Z D Z X and Y X, Y and Z

1 marks

Answer: A

This question in 9700/11 May/June 2022

Q281 · Some foods contain hydrogenated vegetable fats 9700/11 May/June 2022

9 Some foods contain hydrogenated vegetable fats. These are unsaturated fats that have been converted to saturated fats. Which property of the fats will have changed? A Their hydrocarbon chains will fit together more closely. B Their solubility in water will increase. C They will have more double bonds in their molecules. D They will remain liquid at room temperature.

1 marks

Answer: A

This question in 9700/11 May/June 2022

Q282 · Which statement is correct? 9700/11 May/June 2022

11 Which statement is correct? A Amylase, ribose and phospholipid are all macromolecules. B Cellulose, glucose and catalase are all polymers. C Deoxyribose, fructose and ribose are all monosaccharides. D Sucrose, deoxyribose and amylopectin are all polysaccharides.

1 marks

Answer: C

This question in 9700/11 May/June 2022

Q283 · Four extracts from different plant materials were made and tested with Benedict’s solution 9700/12 May/June 2022

6 Four extracts from different plant materials were made and tested with Benedict’s solution. The extracts were boiled with Benedict’s solution for 240 seconds and the final colour was recorded. colour produced extract after 240 seconds 1 red 2 yellow 3 blue 4 green Which sequence of plant extracts represents an increasing quantity of reducing sugar? A 1  2  4  3 B 3  1  2  4 C 3  2  1  4 D 3  4  2  1

1 marks

Answer: D

This question in 9700/12 May/June 2022

Q284 · Which have properties that are dependent on hydrogen bonds? 9700/12 May/June 2022

7 Which have properties that are dependent on hydrogen bonds? 1 cellulose 2 a molecule of haemoglobin 3 water A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: A

This question in 9700/12 May/June 2022

Q285 · Which statement is correct? 9700/12 May/June 2022

8 Which statement is correct? A Cellulose, glycogen and amylopectin are all polymers. B Ribose, amylase and phospholipid are all macromolecules. C Starch, glucose and amylose are all monomers. D Sucrose, deoxyribose and amylopectin are all polysaccharides.

1 marks

Answer: A

This question in 9700/12 May/June 2022

Q286 · Long chain, saturated fatty acids change from solid to liquid at higher temperatures… 9700/12 May/June 2022

13 Long chain, saturated fatty acids change from solid to liquid at higher temperatures compared with short chain, unsaturated fatty acids. Which fatty acids would be more likely to form triglycerides in mammals that live in cold climates? A long chain saturated B long chain unsaturated C short chain saturated D short chain unsaturated

1 marks

Answer: D

This question in 9700/12 May/June 2022

Q287 · The diagram shows three hexose sugars 9700/13 May/June 2022

8 The diagram shows three hexose sugars. CH2OH CH2OH CH2OH O C O C O H H H OH OH H H C C C C C C OH H OH H H OH HO OH HO H H CH2OH C C C C C C H OH H OH OH H 1 2 3 Which row correctly shows examples of carbohydrates in which these three hexose sugars occur? sucrose cellulose amylopectin A 1 2 3 B 1 3 2 C 2 3 1 D 3 2 1

1 marks

Answer: D

This question in 9700/13 May/June 2022

Q288 · Trehalose is a sugar that gives a negative result when tested with Benedict’s solution 9700/13 May/June 2022

9 Trehalose is a sugar that gives a negative result when tested with Benedict’s solution. A molecule of trehalose forms two -glucose molecules when it is hydrolysed. Which row is correct? sugar that gives formula of the same result with trehalose Benedict’s as trehalose A C12H22O11 fructose B C12H22O11 sucrose C C12H24O12 fructose D C12H24O12 sucrose

1 marks

Answer: B

This question in 9700/13 May/June 2022

Q289 · Olestra is an artificial lipid 9700/13 May/June 2022

10 Olestra is an artificial lipid. It is made by attaching fatty acids, by condensation, to a sucrose molecule. A simplified diagram of olestra is shown. R represents the position where fatty acids would be attached. CH2OR O H H ROCH2 O H H OR H O H RO RO CH2OR H OR OR H Humans cannot hydrolyse olestra. However, other animals may be able to do so. How many molecules of water would be needed to hydrolyse one molecule of olestra into fatty acids, fructose and glucose? A 11 B 10 C 9 D 8

1 marks

Answer: C

This question in 9700/13 May/June 2022

Q290 · Which diagram shows the ring form of β-glucose? 9700/11 Oct/Nov 2022

7 Which diagram shows the ring form of β-glucose? A B CH2OH CH2OH H C O OH H C O H H H C C C C OH H OH H HO C C H HO C C OH H OH H OH C D CH2OH CH2OH H C O H H C O H H H C C C C OH OH H H HO C C OH HO C C OH H H OH OH

1 marks

Answer: A

This question in 9700/11 Oct/Nov 2022

Q291 · Which row correctly matches the example with the type of molecule? 9700/11 Oct/Nov 2022

8 Which row correctly matches the example with the type of molecule? disaccharide macromolecule monomer polymer A fructose glycogen glucose starch B starch haemoglobin ribose glycogen C maltose ribonucleic acid sucrose cellulose D sucrose cellulose fructose collagen

1 marks

Answer: D

This question in 9700/11 Oct/Nov 2022

Q292 · The enzyme α-amylase hydrolyses amylopectin but it is not able to hydrolyse some of its… 9700/11 Oct/Nov 2022

9 The enzyme α-amylase hydrolyses amylopectin but it is not able to hydrolyse some of its glycosidic bonds. ● It only hydrolyses 1,4 glycosidic bonds. ● It is not able to hydrolyse the last bond of a chain. ● It is not able to hydrolyse the bonds in a chain of three units attached by a 1,6 glycosidic bond to another chain. Which glycosidic bond can be hydrolysed by α-amylase? O O O A B O O O O O O D C

1 marks

Answer: C

This question in 9700/11 Oct/Nov 2022

Q293 · Molecule X is a lipid 9700/11 Oct/Nov 2022

10 Molecule X is a lipid. H H O H H H H H H H H H H H C C C C C C C C HO C O C C C C C H H H H H H H H OH H H H H H molecule X Which row is correct for molecule X and a triglyceride? molecule X contains triglyceride contains A one unsaturated fatty acid saturated fatty acids B no ester bonds three ester bonds C one fatty acid three fatty acids D two fatty acids three fatty acids

1 marks

Answer: C

This question in 9700/11 Oct/Nov 2022

Q294 · The diagrams show some biological molecules 9700/12 Oct/Nov 2022

7 The diagrams show some biological molecules. Which biological molecule forms a polymer with a structural role in plants? A B CH2OH H C O H H H C OH H C C H C OH OH H HO OH C C H C OH H OH H C D NH2 CH2OH C O N H OH N H C C OH H HO N N HO H O C C C C H OH C C OH OH

1 marks

Answer: D

This question in 9700/12 Oct/Nov 2022

Q295 · Which molecule is a disaccharide and a reducing sugar? 9700/12 Oct/Nov 2022

8 Which molecule is a disaccharide and a reducing sugar? A fructose B glucose C maltose D sucrose

1 marks

Answer: C

This question in 9700/12 Oct/Nov 2022

Q296 · The diagram shows bonding in part of a polysaccharide 9700/12 Oct/Nov 2022

9 The diagram shows bonding in part of a polysaccharide. CH2OH O H OH O X OH CH2OH CH2OH CH2 CH2OH O O O O H H H H OH OH OH OH O O O OH OH OH OH Which type of glycosidic bond is shown at position X? A α-1,4 B α-1,6 C β-1,4 D β-1,6

1 marks

Answer: B

This question in 9700/12 Oct/Nov 2022

Q297 · Which statements about triglycerides and phospholipids are correct? 9700/12 Oct/Nov 2022

10 Which statements about triglycerides and phospholipids are correct? 1 Fatty acids in a triglyceride may be saturated or unsaturated but in a phospholipid they are always saturated. 2 Triglycerides and phospholipids both have a hydrophobic region. 3 Triglycerides are non-polar molecules and phospholipids are polar molecules. A 1 and 2 B 1 only C 2 and 3 D 3 only

1 marks

Answer: C

This question in 9700/12 Oct/Nov 2022

Q298 · Which diagram is correct for α-glucose? 9700/13 Oct/Nov 2022

7 Which diagram is correct for α-glucose? A B CH2OH OH C O C O H H H H H H C C C C OH H OH H HO OH HO OH C C C C H OH CH2OH OH C D OH CH2OH C O C O H OH H OH H H C C C C OH H OH H HO H HO H C C C C CH2OH OH H OH

1 marks

Answer: A

This question in 9700/13 Oct/Nov 2022

Q299 · Which reaction correctly represents one way sucrose can form? 9700/13 Oct/Nov 2022

8 Which reaction correctly represents one way sucrose can form? A (α-glucose – OH–) + (fructose – H+) → sucrose + H2O B (α-glucose + OH–) + (α-glucose + H+) → sucrose – H2O C (α-glucose – OH–) + (β-glucose – H+) → sucrose + H2O D (α-glucose + OH–) + (fructose + H+) → sucrose – H2O

1 marks

Answer: A

This question in 9700/13 Oct/Nov 2022

Q300 · The diagram represents part of an alginic acid molecule 9700/13 Oct/Nov 2022

9 The diagram represents part of an alginic acid molecule. Alginic acid is a polymer found in the cell walls of brown seaweeds. COOH H H O H O H H OH HO OH HO COOH O H H O H H H n Which statement about alginic acid is correct? A Alginic acid is a linear polysaccharide containing 1,6 glycosidic bonds between each hexose sugar. B Alginic acid is formed from two monomers joined by 1,4 glycosidic bonds. C Alternate monosaccharides are arranged in opposite directions; this is also seen in glycogen molecules. D Hexose sugars and water molecules are joined by condensation reactions to make alginic acid.

1 marks

Answer: B

This question in 9700/13 Oct/Nov 2022

Q301 · Which features are correct for triglycerides and phospholipids? 9700/13 Oct/Nov 2022

10 Which features are correct for triglycerides and phospholipids? 1 They have ester bonds between glycerol and fatty acids. 2 Fatty acid chains may have single or double bonds between carbon atoms in the chains. 3 The fatty acid chains are non-polar and hydrophobic. 4 Saturated fatty acid chains allow closer packing of the molecules than unsaturated fatty acid chains. A 1, 2, 3 and 4 B 1 and 3 only C 2, 3 and 4 only D 2 and 4 only

1 marks

Answer: A

This question in 9700/13 Oct/Nov 2022

Q302 · Which statements are correct for amylose and also for amylopectin? 9700/12 Feb/March 2023

8 Which statements are correct for amylose and also for amylopectin? 1 They are carbohydrate molecules. 2 They are formed by condensation reactions. 3 They are linear molecules. 4 They contain -1,4 glycosidic bonds. A 1, 2 and 3 B 1, 2 and 4 C 1, 3 and 4 D 2, 3 and 4

1 marks

Answer: B

This question in 9700/12 Feb/March 2023

Q303 · Which statement is a correct comparison between saturated triglyceride molecules and… 9700/12 Feb/March 2023

9 Which statement is a correct comparison between saturated triglyceride molecules and unsaturated triglyceride molecules of approximately the same molecular masses? A Unsaturated triglycerides have more double bonds and fewer hydrogen atoms than saturated triglycerides. B Unsaturated triglycerides have fewer double bonds and fewer hydrogen atoms than saturated triglycerides. C Unsaturated triglycerides have more double bonds and more hydrogen atoms than saturated triglycerides. D Unsaturated triglycerides have fewer double bonds and more hydrogen atoms than saturated triglycerides.

1 marks

Answer: A

This question in 9700/12 Feb/March 2023

Q304 · Which molecules contain at least three double bonds? 9700/12 Feb/March 2023

12 Which molecules contain at least three double bonds? saturated triglyceride C A D collagen B haemoglobin

1 marks

Answer: D

This question in 9700/12 Feb/March 2023

Q305 · Which polymers are present in all viruses and all prokaryotes? 9700/12 May/June 2023

6 Which polymers are present in all viruses and all prokaryotes? 1 polynucleotides 2 polypeptides 3 polysaccharides A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: B

This question in 9700/12 May/June 2023

Q306 · A student was provided with a solution of carbohydrate 9700/12 May/June 2023

8 A student was provided with a solution of carbohydrate. They removed two samples from the solution and performed tests on each sample, as shown. carbohydrate solution sample one sample two boiled with dilute Benedict’s test hydrochloric acid Benedict’s solution neutralised with dilute remained blue sodium hydroxide Benedict’s test Benedict’s solution turned yellow Which statement explains the results? A Condensation reactions occur in sample two to release reducing sugar. B Glycosidic bonds in a polysaccharide have been broken to release reducing sugar. C Sample one shows that sucrose is present in the carbohydrate solution. D The change in colour to a yellow solution shows that glucose is present.

1 marks

Answer: B

This question in 9700/12 May/June 2023

Q307 · Which molecules contain at least two double bonds? 9700/12 May/June 2023

9 Which molecules contain at least two double bonds? sucrose C A D collagen haemoglobin B

1 marks

Answer: B

This question in 9700/12 May/June 2023

Question 308 9700/12 May/June 2023

10 What describes cellulose? A a branched chain of 1-4 α-glucose B a branched chain of 1-4 β-glucose C an unreactive linear chain of 1-4 α-glucose D an unreactive linear chain of 1-4 β-glucose

1 marks

Answer: D

This question in 9700/12 May/June 2023

Q309 · Which polymers are present in all viruses, all prokaryotes and all eukaryotes? 9700/13 May/June 2023

5 Which polymers are present in all viruses, all prokaryotes and all eukaryotes? 1 polynucleotides 2 polypeptides 3 polysaccharides A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: B

This question in 9700/13 May/June 2023

Q310 · Which features contribute to the function of a cellulose molecule? 9700/13 May/June 2023

8 Which features contribute to the function of a cellulose molecule? 1 Long chains of glucose molecules coil into a helix. 2 Many hydrogen bonds form between adjacent chains. 3 It is insoluble in water. A 1, 2 and 3 B 1 and 3 only C 2 and 3 only D 2 only

1 marks

Answer: C

This question in 9700/13 May/June 2023

Q311 · What correctly describes triglycerides? 9700/13 May/June 2023

9 What correctly describes triglycerides? A non-polar molecules that are soluble in ethanol B non-polar molecules that are soluble in water C polar molecules that are soluble in ethanol D polar molecules that are soluble in water

1 marks

Answer: A

This question in 9700/13 May/June 2023

Q312 · Cocoa butter contains three different triglycerides 9700/13 May/June 2023

10 Cocoa butter contains three different triglycerides. These triglycerides are made from the fatty acids: • oleic acid (O) • palmitic acid (P) • stearic acid (S). The three triglycerides found in cocoa butter are POS, SOS and POP. The chemical structure of the triglyceride POS is shown next to a diagrammatic representation of POS. H O H H H H H H H H H H H H H H H H C O C C C C C C C C C C C C C C C C H G P H H H H H H H H H H H H H H H L Y O H H H H H H H H H H H H H H H H H C H C O C C C C C C C C C C C C C C C C C C H O E H H H H H H H H H H H H H H H R O H H H H H H H H H H H H H H H H H O H C O C C C C C C C C C C C C C C C C C C H L S H H H H H H H H H H H H H H H H H H Which statement is correct? A Triglyceride POP contains two unsaturated fatty acids joined by ester bonds to glycerol. B Triglyceride POS contains two less carbon atoms than triglyceride POP. C Triglyceride SOS contains four more carbon atoms than triglyceride POP. D Triglyceride SOS contains two saturated fatty acids joined by hydrolysis to glycerol.

1 marks

Answer: C

This question in 9700/13 May/June 2023

Q313 · Which molecules contain at least four double bonds? 9700/13 May/June 2023

11 Which molecules contain at least four double bonds? unsaturated triglyceride C A D haemoglobin collagen B

1 marks

Answer: D

This question in 9700/13 May/June 2023

Q314 · Which statements about amylopectin and glycogen are correct? 9700/12 Oct/Nov 2023

9 Which statements about amylopectin and glycogen are correct? 1 Amylopectin and glycogen contain 1-4 glycosidic bonds. 2 Amylopectin contains -glucose. 3 Glycogen contains more 1-6 branches than amylopectin. A 1 and 2 B 1 and 3 C 1 only D 2 and 3

1 marks

Answer: B

This question in 9700/12 Oct/Nov 2023

Q315 · How many statements about fatty acids are correct? 9700/12 Oct/Nov 2023

10 How many statements about fatty acids are correct?  Fatty acids are either saturated or unsaturated.  Fatty acids always have at least two double bonds.  Long chains of fatty acids are very good energy stores.  Fatty acids are insoluble in water and do not affect the water potential of the cell. A 1 B 2 C 3 D 4

1 marks

Answer: C

This question in 9700/12 Oct/Nov 2023

Q316 · The diagram shows the structure of a monomer 9700/13 Oct/Nov 2023

9 The diagram shows the structure of a monomer. CH2OH O H H H OH H HO OH H OH Which molecules contain this monomer? amylopectin A C B glycogen D sucrose

1 marks

Answer: B

This question in 9700/13 Oct/Nov 2023

Q317 · A triglyceride consists of glycerol and three different fatty acids: linoleic acid (L)… 9700/13 Oct/Nov 2023

10 A triglyceride consists of glycerol and three different fatty acids: linoleic acid (L), oleic acid (O) and palmitic acid (P). The diagram shows one possible arrangement of the fatty acids L, O and P in the molecule. L glycerol O P What is the total number of different arrangements of the fatty acids in this triglyceride? A 3 B 4 C 5 D 9

1 marks

Answer: A

This question in 9700/13 Oct/Nov 2023

Q318 · Which feature of cellulose molecules contributes to the function of plant cell walls? 9700/13 Oct/Nov 2023

13 Which feature of cellulose molecules contributes to the function of plant cell walls? A Adjacent cellulose molecules are linked by glycosidic bonds. B Branched chains of β-glucose molecules are linked by hydrogen bonds. C Molecules of α-glucose are linked by 1-6 glycosidic bonds. D Unbranched chains of β-glucose are linked by hydrogen bonds.

1 marks

Answer: D

This question in 9700/13 Oct/Nov 2023

Q319 · Which diagrams show the release of a water molecule during the formation of a glycosidic… 9700/12 Feb/March 2024

8 Which diagrams show the release of a water molecule during the formation of a glycosidic bond? 1 2 CH2OH CH2OH CH2OH H O H H O H H O OH HO H HO OH HO OH HO H H O OH H2O CH2OH H2O 3 CH2OH H O H HO OH H2O CH2OH H O H HO OH A 1, 2 and 3 B 1 only C 2 and 3 only D 3 only

1 marks

Answer: A

This question in 9700/12 Feb/March 2024

Q320 · Which molecules have a structural formula that contains C=O bonds? 9700/12 Feb/March 2024

9 Which molecules have a structural formula that contains C=O bonds? 1 amino acids 2 fatty acids 3 glycerol 4 protein A 1, 2 and 3 B 1, 2 and 4 C 1, 3 and 4 D 2, 3 and 4

1 marks

Answer: B

This question in 9700/12 Feb/March 2024

Q321 · Which statement about triglycerides is correct? 9700/12 Feb/March 2024

10 Which statement about triglycerides is correct? A In any triglyceride, all the fatty acids are saturated or all the fatty acids are unsaturated. B Two triglycerides are joined together by an ester bond. C Triglycerides are polar hydrophobic molecules. D Glycerol is joined to each fatty acid by a covalent bond.

1 marks

Answer: D

This question in 9700/12 Feb/March 2024

Q322 · The diagram shows the structure of part of a peptidoglycan molecule 9700/12 Feb/March 2024

12 The diagram shows the structure of part of a peptidoglycan molecule. H CH2OH H O O H OH H H O H H O O O H CH2OH H3C CH C O NH HC CH3 CO NH HC (CH3)2COOH CO NH NH2 HC (CH3)2CHCOOH CO NH HC COOH CH3 Which type of 1,4 linkage and how many peptide bonds are shown in this part of the molecule? type of number of 1,4 linkage peptide bonds A α-1,4 3 B α-1,4 4 C β-1,4 3 D β-1,4 4

1 marks

Answer: D

This question in 9700/12 Feb/March 2024

Q323 · The table shows the number of carbon atoms and the number of carbon–carbon double bonds… 9700/11 May/June 2024

7 The table shows the number of carbon atoms and the number of carbon–carbon double bonds in molecules of three triglycerides and the fatty acids they contain. The information is shown in the format ‘number of carbon atoms : number of carbon–carbon double bonds’. triglyceride fatty acid 1 fatty acid 2 fatty acid 3 54 : 1 15 : 0 18 : 0 18 : 1 56 : 4 17 : 0 X 18 : 2 57 : 3 18 : 0 18 : 1 18 : 2 Which description matches fatty acid 2 of the 56 : 4 triglyceride, identified in the table as X? A saturated with 17 carbon atoms B saturated with 18 carbon atoms C unsaturated with 17 carbon atoms D unsaturated with 18 carbon atoms

1 marks

Answer: D

This question in 9700/11 May/June 2024

Q324 · Which row is correct for cellulose? 9700/12 May/June 2024

6 Which row is correct for cellulose? rotation of alternate monomers by 180° shape of molecule hydrogen bonds between molecules 0 0O WwW > v x x Jv branched branched unbranched unbranched x v x v key J = present X = not present

1 marks

Answer: D

This question in 9700/12 May/June 2024

Q325 · Which statements describe features of cellulose that adapt it for its function in plant… 9700/13 May/June 2024

6 Which statements describe features of cellulose that adapt it for its function in plant cells? 1 Three cellulose molecules coil around each other to form a triple helix structure. 2 Many hydrogen bonds form between adjacent cellulose molecules. 3 Covalent bonds form between adjacent cellulose molecules. A 1, 2 and 3 B 1 and 3 only C 2 and 3 only D 2 only

1 marks

Answer: D

This question in 9700/13 May/June 2024

Q326 · Which structure shows -glucose? 9700/13 May/June 2024

7 Which structure shows -glucose? A B CH2OH CH2OH C O C O H OH H H H H C C C C OH H OH H HO H HO OH C C C C H OH H OH C D H CH2OH C O C O H CH2OH HO OH H H C C C C H H OH H HO OH H H C C C C OH OH H OH

1 marks

Answer: B

This question in 9700/13 May/June 2024

Q327 · What cannot occur as a result of a condensation reaction? 9700/13 May/June 2024

8 What cannot occur as a result of a condensation reaction? A breaking of a glycosidic bond B formation of a disaccharide C joining together of two amino acids D production of a molecule of water

1 marks

Answer: A

This question in 9700/13 May/June 2024

Q328 · A naturally occurring polysaccharide synthesised in a plant is a branched chain of… 9700/11 Oct/Nov 2024

7 A naturally occurring polysaccharide synthesised in a plant is a branched chain of -glucose. The straight parts of the molecule are linked by -1,6 glycosidic bonds with only a small number of branches which are linked by either an -1,3 glycosidic bond or an -1,4 glycosidic bond. Which polysaccharide has a structure most similar to that described? A amylopectin B amylose C cellulose D glycogen

1 marks

Answer: A

This question in 9700/11 Oct/Nov 2024

Q329 · The diagram shows a triglyceride 9700/11 Oct/Nov 2024

8 The diagram shows a triglyceride. O H2COC O HCOC O H2COC An enzyme was used to digest this triglyceride into glycerol and fatty acids. Which scatter plot correctly represents each fatty acid component of the triglyceride? A B 4 4 3 3 number of number of carbon–carbon 2 carbon–carbon 2 double bonds double bonds 1 1 0 0 15 16 17 18 19 20 15 16 17 18 19 20 number of carbon atoms number of carbon atoms C D 4 4 3 3 number of number of carbon–carbon 2 carbon–carbon 2 double bonds double bonds 1 1 0 0 15 16 17 18 19 20 15 16 17 18 19 20 number of carbon atoms number of carbon atoms

1 marks

Answer: B

This question in 9700/11 Oct/Nov 2024

Q330 · The diagram shows how the alternating nature of -glucose monomers along a chain allows… 9700/11 Oct/Nov 2024

9 The diagram shows how the alternating nature of -glucose monomers along a chain allows hydrogen bonds to form between consecutive monomers. HO OH C6 HO C3 C2 C5 O O O C4 C1 C4 C1 O key = hydrogen bond C5 O C3 C2 HO C6 HO OH Hydrogen bonds in cellulose affect the tensile strength (the ability to withstand pulling forces without breaking). How do the hydrogen bonds shown in the diagram help cellulose function as a suitable material for a cell wall? A The hydrogen bonds add additional tensile strength along individual cellulose molecules within the cell wall. B The hydrogen bonds create stronger crosslinks between adjacent cellulose molecules, adding to the tensile strength of the cell wall. C Stronger hydrogen bonds form between adjacent cellulose molecules, adding to the tensile strength of the cell wall. D Cellulose molecules within a cellulose microfibril have a stronger link between them, increasing the tensile strength of the cellulose microfibrils.

1 marks

Answer: A

This question in 9700/11 Oct/Nov 2024

Q331 · Which feature of glycogen distinguishes it from starch? 9700/12 Oct/Nov 2024

8 Which feature of glycogen distinguishes it from starch? A All glycogen molecules are highly branched. B All glycogen molecules are polysaccharides. C All glycogen molecules contain -glucose. D All glycogen molecules contain 1,4-glycosidic bonds.

1 marks

Answer: A

This question in 9700/12 Oct/Nov 2024

Q332 · The diagram shows a biological molecule 9700/12 Oct/Nov 2024

9 The diagram shows a biological molecule. H H H H H H O H H H H H H C C C C C C H H C O C C C C C C H H H H H H H H H H H H H H H H H H O H H H H H H H H C C C C C C C C H H C O C C C C C C C C H H H H H H H H H H H H H H H H H H H H H O H H H H H H H C C C C C C C H H C O C C C C C C C H H H H H H H H H H H H H H Which molecules would be produced if this biological molecule was hydrolysed? A amino acids and glycerol only B amino acids, glycerol and water C fatty acids and glycerol only D fatty acids, glycerol and water

1 marks

Answer: C

This question in 9700/12 Oct/Nov 2024

Q333 · A mixture of glucose and starch solutions was placed in a length of dialysis (Visking)… 9700/12 Oct/Nov 2024

10 A mixture of glucose and starch solutions was placed in a length of dialysis (Visking) tubing and the tubing sealed. The tubing was then placed in a boiling tube containing distilled water. Two samples were immediately removed from this water (time 0 minutes) and tested with either iodine solution or Benedict’s solution. This was repeated at 10 minute intervals for 30 minutes. The iodine solution gave an orange-brown colour each time. The table shows the results of the Benedict’s test. time / minutes 0 10 20 30 colour produced blue green yellow red by Benedict’s test What may be concluded from these results? 1 The pores in the Visking tubing are too small for a starch molecule to pass through. 2 Glucose diffuses through the Visking tubing down a diffusion gradient. 3 Water diffuses into the Visking tubing. A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: B

This question in 9700/12 Oct/Nov 2024

Q334 · Phospholipids are formed in a similar way to triglycerides 9700/12 Oct/Nov 2024

14 Phospholipids are formed in a similar way to triglycerides. A sample contained six phospholipid molecules. ● The molecular weight of a phosphate ion is 95 g mol–1. ● The molecular weight of each individual fatty acid in this sample was found to be 282 g mol–1. ● The molecular weight of glycerol is 92 g mol–1. ● The molecular weight of water is 18 g mol–1. What is the molecular weight of the sample in g mol–1? A 2598 B 4182 C 4506 D 4830

1 marks

Answer: B

This question in 9700/12 Oct/Nov 2024

Q335 · The diagram shows a triglyceride 9700/13 Oct/Nov 2024

6 The diagram shows a triglyceride. O H H H H H H H H H H C C C C C C C C C C H H C O H H H H H H H H H O H H H H H H H H H C C C C C C C C C C H H C O H H H H H H H H H O H H H H H H H H C C C C C C C H C C H C O H H H H H C H H H H What will be the products after hydrolysis of this triglyceride? A 1 molecule of glycogen, 3 unsaturated fatty acids and 3 molecules of water B 1 molecule of glycerol, 2 saturated fatty acids and 1 unsaturated fatty acid C 1 molecule of glycogen, 2 saturated fatty acids and 1 unsaturated fatty acid D 1 molecule of glycerol, 1 saturated fatty acid, 2 unsaturated fatty acids and 3 molecules of water

1 marks

Answer: B

This question in 9700/13 Oct/Nov 2024

Q336 · Which row is correct for parts of a phospholipid molecule? 9700/13 Oct/Nov 2024

16 Which row is correct for parts of a phospholipid molecule? can be saturated can also be found or unsaturated in a triglyceride A head tail B tail head C head head D tail tail

1 marks

Answer: D

This question in 9700/13 Oct/Nov 2024

Q337 · What could take place during a hydrolysis reaction? 9700/12 Feb/March 2025

7 What could take place during a hydrolysis reaction? 1 A glycosidic bond is broken. 2 A molecule of water is produced. 3 A sucrose molecule is split into fructose and glucose. A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: C

This question in 9700/12 Feb/March 2025

Q338 · Sugars with a ring structure can also have a linear structure 9700/12 Feb/March 2025

8 Sugars with a ring structure can also have a linear structure. Which sugar molecules could be represented by the linear structure shown in the diagram? H O C H C OH HO C H H C OH H C OH CH2OH A glucose, deoxyribose and ribose B glucose only C deoxyribose and ribose only D deoxyribose only

1 marks

Answer: B

This question in 9700/12 Feb/March 2025

Q339 · Which statement about triglycerides is correct? 9700/12 Feb/March 2025

9 Which statement about triglycerides is correct? A Each triglyceride molecule is formed by combining three fatty acid molecules with a glycogen molecule. B A triglyceride molecule contains four ester bonds, each formed in a condensation reaction. C Triglyceride molecules form a bilayer in the cell surface membranes of cells due to hydrophobic and hydrophilic interactions. D The ratio of oxygen atoms to carbon atoms is lower for triglyceride molecules than for carbohydrate molecules.

1 marks

Answer: D

This question in 9700/12 Feb/March 2025

Q340 · Plant cell walls are strengthened by cellulose molecules that are arranged in several… 9700/12 Feb/March 2025

11 Plant cell walls are strengthened by cellulose molecules that are arranged in several layers. Within each layer, the cellulose molecules are arranged in the same direction (parallel). Which row shows the bonds that hold adjacent cellulose molecules together within each layer and the arrangement of cellulose molecules in different layers? bonds that hold arrangement of adjacent cellulose cellulose molecules molecules together in different layers A glycosidic in different directions B glycosidic parallel C hydrogen in different directions D hydrogen parallel

1 marks

Answer: C

This question in 9700/12 Feb/March 2025

Q341 · Galactogen is a storage polysaccharide in some animal species 9700/12 Feb/March 2025

12 Galactogen is a storage polysaccharide in some animal species. It is a branched polymer that is formed from -galactose monomers. Which comparison of galactogen with another polysaccharide correctly summarises one similarity and one difference? A Glycogen and galactogen are both branched, but glycogen is not a storage polysaccharide in animals. B Glycogen and galactogen are both storage polysaccharides in animals, but glycogen is unbranched. C Cellulose and galactogen are both branched, but cellulose is a structural polysaccharide found in plants. D Amylopectin and galactogen are both storage polysaccharides, but amylopectin is formed from -glucose monomers.

1 marks

Answer: D

This question in 9700/12 Feb/March 2025

Q342 · A sample of a solution of sucrose tested for reducing sugars remains blue, but when… 9700/12 May/June 2025

7 A sample of a solution of sucrose tested for reducing sugars remains blue, but when another sample of the same solution is tested for non-reducing sugars the solution turns red. What explains these results? A During the non-reducing sugar test, an acid hydrolyses sucrose to glucose and fructose. B During the non-reducing sugar test, sucrose molecules condense into polysaccharides. C The reducing sugar test converts sucrose into glucose and fructose. D The reducing sugar test hydrolyses monosaccharides to disaccharides.

1 marks

Answer: A

This question in 9700/12 May/June 2025

Q343 · Which molecules contain at least two double bonds? 9700/12 May/June 2025

8 Which molecules contain at least two double bonds? saturated triglyceride C A D collagen haemoglobin B

1 marks

Answer: D

This question in 9700/12 May/June 2025

Q344 · Amylose, amylopectin and glycogen are all polysaccharides 9700/12 May/June 2025

9 Amylose, amylopectin and glycogen are all polysaccharides. Enzyme X removes one maltose molecule at a time from the ends of a polysaccharide molecule by hydrolysis of -1,4-glycosidic bonds. Which row shows how completely each of these molecules will be hydrolysed by enzyme X? (Assume that each polysaccharide is composed of the same number of monomers before hydrolysis begins.) least completely most completely hydrolysed hydrolysed A amylose amylopectin glycogen B amylose glycogen amylopectin C glycogen amylose amylopectin D glycogen amylopectin amylose

1 marks

Answer: D

This question in 9700/12 May/June 2025

Q345 · Cell membranes become less fluid as the temperature decreases 9700/12 May/June 2025

17 Cell membranes become less fluid as the temperature decreases. Bacteria and yeast cannot regulate their cell temperatures. How do bacteria and yeast maintain the fluidity of their cell membranes when the temperature decreases? 1 They increase the numbers of unsaturated fatty acids in their phospholipid molecules. 2 They increase the numbers of saturated fatty acids in their phospholipid molecules. 3 They increase the numbers of cholesterol molecules in their cell membranes. A 1 and 3 B 1 only C 2 and 3 D 2 only

1 marks

Answer: A

This question in 9700/12 May/June 2025

Q346 · Which statement about a macromolecule is correct? 9700/13 May/June 2025

8 Which statement about a macromolecule is correct? A Amylose is a branched polymer made of -glucose and -glucose monomers. B DNA is an association of two polymers made of nucleotide monomers. C Haemoglobin is an association of four polymers made up of monomers of haem groups and amino acids. D Triglycerides are polymers made of fatty acids and glycerol.

1 marks

Answer: B

This question in 9700/13 May/June 2025

Q347 · What happens to molecules of sucrose when they are heated with acid? 9700/13 May/June 2025

9 What happens to molecules of sucrose when they are heated with acid? A Glycosidic bonds are broken by condensation using water, releasing only glucose. B Glycosidic bonds are broken by condensation, releasing fructose, glucose and water. C Glycosidic bonds are broken by hydrolysis using water, releasing fructose and glucose. D Glycosidic bonds are broken by hydrolysis, releasing fructose, glucose and water.

1 marks

Answer: C

This question in 9700/13 May/June 2025

Q348 · The diagrams show how some polymers of glucose can be classified 9700/13 May/June 2025

10 The diagrams show how some polymers of glucose can be classified. polymer function R starch P P Q amylose Q Which row correctly identifies P, Q and R? polymer P polymer Q function R A cellulose amylopectin structural support B glycogen amylopectin energy storage C cellulose glycogen energy storage D glycogen cellulose structural support

1 marks

Answer: B

This question in 9700/13 May/June 2025

Q349 · Which molecules have products containing a carboxyl group when they are hydrolysed? 9700/13 May/June 2025

11 Which molecules have products containing a carboxyl group when they are hydrolysed? 1 phospholipids 2 polysaccharides 3 proteins A 1 and 2 B 1 and 3 C 2 and 3 D 3 only

1 marks

Answer: B

This question in 9700/13 May/June 2025

Q350 · Which molecule is required for this reaction to occur? 9700/14 May/June 2025

9 Which molecule is required for this reaction to occur? C12H22O11 + H2O  C6H12O6 + C6H12O6 A catalase B copper sulfate C hydrochloric acid D sodium hydroxide

1 marks

Answer: C

This question in 9700/14 May/June 2025

Q351 · Which molecules contain at least two double bonds? 9700/14 May/June 2025

10 Which molecules contain at least two double bonds? unsaturated fatty acid C A D collagen haemoglobin B

1 marks

Answer: D

This question in 9700/14 May/June 2025

Q352 · Solution X was tested for the presence of non-reducing sugars 9700/11 Oct/Nov 2025

6 Solution X was tested for the presence of non-reducing sugars. It did not contain reducing sugars. Some steps that can be used to test for the presence of biological molecules are listed. 1 Add Benedict’s solution to the test-tube. 2 Add dilute hydrochloric acid to the test-tube. 3 Add sodium hydrogencarbonate to the test-tube. 4 Heat the test-tube in a water-bath. Which order of steps to identify the presence of non-reducing sugars in solution X is correct? A 1  4 B 2  3  1  4 C 2  4  3  1  4 D 3  2  4  1

1 marks

Answer: C

This question in 9700/11 Oct/Nov 2025

Q353 · The diagram shows the structure of part of a biological molecule 9700/11 Oct/Nov 2025

7 The diagram shows the structure of part of a biological molecule. HOH2C O O CH2 O HO CH2OH OH OH OH OH HOH2C O O HO CH2 OH HOH2C O O CH2 O O CH2 O O HO HO HO CH2OH CH2OH CH2 OH OH OH HOH2C O O HO CH2 OH HOH2C O O HO CH2 OH Which statements about this biological molecule are correct? 1 It has monomers joined by ester bonds. 2 It is a macromolecule. 3 It is a polysaccharide. A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: D

This question in 9700/11 Oct/Nov 2025

Q354 · Which diagram has a covalent bond that joins monomers together to form a biological… 9700/11 Oct/Nov 2025

8 Which diagram has a covalent bond that joins monomers together to form a biological polymer in eukaryotes? A B C D O R H O R O R R NH3 + –O C R C O R O R O P O R O–

1 marks

Answer: D

This question in 9700/11 Oct/Nov 2025

Q355 · Which feature of storage polysaccharides means they do not change the water potential of… 9700/11 Oct/Nov 2025

9 Which feature of storage polysaccharides means they do not change the water potential of cells? A They are easily hydrolysed. B They are compact. C They are insoluble. D They are branched molecules.

1 marks

Answer: C

This question in 9700/11 Oct/Nov 2025

Q356 · Which molecules contain at least four double bonds? 9700/11 Oct/Nov 2025

10 Which molecules contain at least four double bonds? saturated triglyceride C A D collagen haemoglobin B

1 marks

Answer: B

This question in 9700/11 Oct/Nov 2025

Q357 · The diagram shows some steps in a laboratory method used to identify the presence of… 9700/13 Oct/Nov 2025

8 The diagram shows some steps in a laboratory method used to identify the presence of non-reducing sugars in a food sample. Some terms are missing. step X step Y end colour Z Which terms are correct for the expected result for a very low concentration of non-reducing sugar? X Y Z A acid hydrolysis Benedict’s test orange B Benedict’s test acid hydrolysis orange C acid hydrolysis Benedict’s test green D Benedict’s test acid hydrolysis green

1 marks

Answer: C

This question in 9700/13 Oct/Nov 2025

Q358 · Many biological molecules exist as polymers made up of monomer subunits 9700/13 Oct/Nov 2025

9 Many biological molecules exist as polymers made up of monomer subunits. Which row correctly identifies the monomer in each of the biological molecules? collagen glycogen cellulose A amino acid -glucose -glucose B -glucose -glucose amino acid C -glucose amino acid -glucose D amino acid -glucose -glucose

1 marks

Answer: A

This question in 9700/13 Oct/Nov 2025

Q359 · Which statement correctly explains the result when the two molecules shown in the diagram… 9700/13 Oct/Nov 2025

10 Which statement correctly explains the result when the two molecules shown in the diagram react together? CH2OH CH2OH H C O H H C O H H H C OH H C C OH H C O HO C C C C OH H OH H OH H2O A A hydrolysis reaction is forming the disaccharide maltose. B A reducing sugar is split into two monosaccharides by hydrolysis. C Condensation of two -glucose molecules is taking place. D A condensation reaction is forming two reducing sugars.

1 marks

Answer: B

This question in 9700/13 Oct/Nov 2025

Q360 · Which row describes amylopectin? 9700/13 Oct/Nov 2025

11. Which row describes amylopectin? a-1,4 a-1,6 idi idi shape of function of glycosidic gIYCOSICIC molecule molecule bonds bonds A Jv v branched storage B Jv x helical storage Cc v Jv branched structural D x Jv helical structural key J/ = present X = not present

1 marks

Answer: A

This question in 9700/13 Oct/Nov 2025

Q361 · What is a feature of triglyceride molecules? 9700/13 Oct/Nov 2025

12 What is a feature of triglyceride molecules? A They are hydrophobic molecules. B They are molecules with a single ester bond. C They are polar molecules. D They are water-soluble molecules.

1 marks

Answer: A

This question in 9700/13 Oct/Nov 2025

Q362 · An unsaturated fatty acid molecule has 17 carbon atoms in the tail which is attached to… 9700/13 Oct/Nov 2025

13 An unsaturated fatty acid molecule has 17 carbon atoms in the tail which is attached to its carboxyl group. The tail contains three double bonds. How many hydrogen atoms does the tail contain? A 29 B 31 C 33 D 35

1 marks

Answer: A

This question in 9700/13 Oct/Nov 2025

Q363 · Which statement about phospholipids in the bilayer of a cell surface membrane is correct? 9700/13 Oct/Nov 2025

14 Which statement about phospholipids in the bilayer of a cell surface membrane is correct? A The non-polar phosphate heads face outwards and the polar fatty acid tails face inwards. B The polar phosphate heads face outwards and the non-polar fatty acid tails face inwards. C The non-polar fatty acid tails face outwards and the polar phosphate heads face inwards. D The polar fatty acid tails face outwards and the non-polar phosphate heads face inwards.

1 marks

Answer: B

This question in 9700/13 Oct/Nov 2025