Cambridge A Level Biology 9700 — 2012 Oct/Nov Paper 1 · Variant 3

Question 1

1 Which feature is found in both prokaryotic and plant cells? A cell wall B DNA bound to protein C endoplasmic reticulum D Golgi apparatus

Accepted Answer

A

Question 2

2 What leaves the nucleus through the pores in the nuclear envelope? 1 DNA 2 mRNA 3 ribosomes A 1 only B 2 only C 1 and 2 D 2 and 3

Accepted Answer

D

Question 3

3 The same plant cells were viewed by a student using an electron microscope and a light microscope. The electron microscope used a magnification of ×1000. The light microscope used a ×10 eyepiece lens and a ×100 objective lens. The student concluded that the image of the plant cell obtained using the electron microscope was clearer and more detailed than the image obtained using the light microscope. Which explanation supports this conclusion? A The electron microscope had a poorer resolution than the light microscope, but was better able to distinguish between two separate points. B The magnification used in the two microscopes was the same, but the electron microscope had a better resolution than the light microscope. C The student used the electron microscope at a higher magnification than the light microscope which led to an improved resolution. D The two microscopes had the same resolution, but the magnification used in the electron microscope gave an image that was ten times larger than the light microscope.

Accepted Answer

B

Question 4

4 The diagram shows an organelle drawn at a magnification of ×20 000. What is the maximum length of the organelle? A 3 × 10–1 µm B 3 × 100 µm C 3 × 101 µm D 3 × 102 µm

Accepted Answer

B

Question 5

5 When drawing a plan diagram of a transverse section of a dicotyledonous leaf, which feature should not be included? A cuticle on the upper epidermis B palisade mesophyll layer C vascular bundles in the leaf lamina D xylem vessel elements

Accepted Answer

D

Question 6

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

Accepted Answer

D

Question 7

7 Which bonds are the last to break when an enzyme is heated? A disulfide B hydrogen C hydrophobic interactions D ionic

Accepted Answer

A

Question 8

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

Accepted Answer

B

Question 9

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

Accepted Answer

B

Question 10

10 Five biochemical tests were carried out on four unknown substances, A, B, C and D.

Following the tests, it was possible to determine the presence or absence of each of the
biochemicals in each substance.

Which substance contains glucose, fat and protein?

test
substance reducing vn sar emulsion iodine biuret
A Vv x v x Y rey
B y x x 4 J / = present
Cc x Jv Jv Jv x X = absent
D x v v x ‘

Accepted Answer

A

Question 11

11 What describes a globular protein that is not soluble in water? A having amino acids with hydrophilic R groups facing out B having amino acids with polar R groups facing out C having a central core of amino acids with hydrophobic R groups D having amino acids with hydrophobic R groups facing out

Accepted Answer

D

Question 12

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.

Accepted Answer

A

Question 13

13 The diagrams show where an inhibitor becomes attached to an enzyme and whether this is permanent or temporary. substrate enzyme 1 2 3 4 inhibitor permanent permanent temporary temporary Which diagrams represent a non-competitive inhibitor? A 1 and 2 only B 2 and 3 only C 3 and 4 only D 1, 2 and 3 only

Accepted Answer

D

Question 14

14 The diagrams show two molecules found in cell surface membranes. Which part affects the fluidity of the membrane? A B D C

Accepted Answer

B

Question 15

15 The graph shows how the rate of entry of glucose into a cell changes as the concentration of glucose outside the cell changes. X rate of entry of glucose into the cell concentration of glucose outside the cell What is the cause of the plateau at X? 1 All the carrier proteins are saturated with glucose. 2 The cell has used up its supply of ATP. 3 The concentrations of glucose inside and outside the cell are equal. A 1 only B 3 only C 1 and 2 only D 2 and 3 only

Accepted Answer

A

Question 16

16 The following are all processes by which substances can enter cells. 1 phagocytosis 2 active transport 3 facilitated diffusion Which processes require ATP? A 1 only B 2 only C 1 and 2 only D 2 and 3 only

Accepted Answer

C

Question 17

17 Which diagram represents a cell undergoing metaphase of mitosis? A B C D

Accepted Answer

C

Question 18

18 Colchicine is a substance which inhibits the formation of spindle fibres. At which stage is the cell cycle interrupted? A cell division B DNA replication C interphase D mitosis

Accepted Answer

D

Question 19

19 The sequence of nucleotides in DNA in a gene that controls the synthesis of a protein is arranged in triplets, each coding for specific amino acids. The table shows three examples of these triplets. triplet code example 1 DNA code TAC 2 mRNA code AUG 3 tRNA code UAC Which are the correct codon and anticodon? codon anticodon A 1 3 B 2 3 C 3 1 D 3 2

Accepted Answer

B

Question 20

20 Enzymes are ……1…… proteins, made up of polypeptides. A gene is a sequence of ……2……, which are parts of a ……3…… molecule coding for a polypeptide. Which words correctly complete gaps 1, 2 and 3 in the sentences? 1 2 3 A fibrous amino acids tRNA B fibrous bases DNA C globular nucleotides DNA D globular triplets mRNA

Accepted Answer

C

Question 21

21 Which process does not occur during the formation of messenger RNA? A condensation B polymerisation C replication D transcription

Accepted Answer

C

Question 22

22 Which correctly matches the structure and function of sieve tube elements? structure function A cellulose cell wall with no lignin to prevent loss of water B end walls modified to slow down the rate of form sieve plates transport of solutes C elongated cells joined form a tube to transport dissolved end to end mineral ions and water D peripheral cytoplasm to provide as little resistance with no nucleus to flow as possible

Accepted Answer

D

Question 23

23 How do single-celled organisms survive without a specialised transport system? A Their cell surface membranes are totally permeable. B They do not move very often. C They do not need to absorb oxygen. D They have a large surface area to volume ratio.

Accepted Answer

D

Question 24

24 The photomicrograph shows a transverse section of a leaf. Which cell has the least negative water potential? C B D A

Accepted Answer

A

Question 25

25 What occurs during the movement of water through the apoplast pathway? 1 water enters cell wall 2 water enters cytoplasm through plasma membrane 3 water enters vacuoles 4 water moves from cell to cell through plasmodesmata 5 water moves from cell wall to cell wall through intercellular spaces A 1 and 5 B 2 and 4 C 1, 3 and 4 D 2, 3 and 5

Accepted Answer

A

Question 26

26 Why does the red blood cell count of humans increase when they remain at high altitudes? A Haemoglobin is not saturated with oxygen in the lungs. B The partial pressure of oxygen is higher. C The percentage of oxygen in the air has decreased. D There is more carbon dioxide, increasing the Bohr effect.

Accepted Answer

A

Question 27

27 Which row correctly shows all the blood vessels that have the features in the table below? collagen fibres squamous thick tunica media present in tunica endothelium present present externa (adventitia) A arteries and arteries and veins veins capillaries B arteries, capillaries arteries arteries and veins and veins C arteries and veins arteries and veins arteries D veins and capillaries veins veins

Accepted Answer

B

Question 28

28 The graph shows the dissociation of oxygen from haemoglobin at two different pHs. 100 curve 1 percentage saturation of haemoglobin curve 2 with oxygen 0 0 oxygen partial pressure Which curve represents the lower pH and in which tissue might the data have been recorded? lower pH tissue A curve 1 active muscle B curve 1 resting muscle C curve 2 active muscle D curve 2 resting muscle

Accepted Answer

C

Question 29

29 The diagram shows changes in pressure in the left side of the heart during the cardiac cycle. R Q key pressure left ventricle aorta P S left atrium 0 0 time Which statement about the heart valves is correct? A At P, the atrioventricular valve opens. B At Q, the semilunar valve opens. C At R, the semilunar valve opens. D At S, the atrioventricular valve closes.

Accepted Answer

B

Question 30

30 When a person suffers an asthma attack, the tubes of the gas exchange system narrow and extra mucus is produced. Which of these changes occur during an asthma attack? 1 Activity of ciliated epithelium increases. 2 Endocytosis in goblet cells increases. 3 Smooth muscles more active. A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3

Accepted Answer

B

Question 31

31 Which symptoms may be seen in a person affected by chronic obstructive pulmonary disease (COPD)? 1 persistent cough 2 less elastic alveoli 3 increased risk of lung infection 4 shortness of breath A 1 and 4 only B 1, 2 and 3 only C 2, 3 and 4 only D 1, 2, 3 and 4

Accepted Answer

D

Question 32

32 Which row shows the effects of chronic bronchitis? T-helper cells bronchioles infection A destroyed inflamed absent B destroyed narrowed present C increased stiffened absent D increased scarred present

Accepted Answer

D

Question 33

33 An oxygen molecule diffuses directly from the air in an alveolus to haemoglobin in a red blood cell. What is the minimum number of cell surface membranes through which this molecule must pass? A 2 B 3 C 4 D 5

Accepted Answer

D

Question 34

34 For some diseases, one of the most effective measures for prevention and control is tracing people who have been in contact with infected people. For which disease would tracing the contacts of infected people help in its prevention and control? A Cholera, as it can be treated successfully with carefully selected antibiotics. B Malaria, as it is transmitted by animals, so the transmission cycle of the pathogen can be broken. C Measles, as it can cause an epidemic and can be controlled by other methods. D Sickle cell anaemia, as it is genetically inherited, so there is time to act before more individuals are affected.

Accepted Answer

C

Question 35

35 A child is vaccinated against a viral disease. A few weeks later she is exposed to the same virus. What is the expected response to this exposure? A increased numbers of B-lymphocytes B increased numbers of T-lymphocytes C large numbers of antibodies are released D large numbers of antigens are released

Accepted Answer

C

Question 36

36 Why has it proved difficult to develop an effective vaccine against malaria? A Mosquitoes have many stages in their life cycles. B The human immune system does not recognise the antigens of the parasite. C The parasites can only be attacked when outside the liver cells and red blood cells. D Vaccines are rapidly broken down by proteases in the stomach.

Accepted Answer

C

Question 37

37 Which statement describes a role of lymphocytes in the immune response? A B-lymphocytes divide to produce killer lymphocytes. B B-lymphocytes produce memory cells. C T-lymphocytes are involved in the humoral response. D T-lymphocytes clone producing antibody-secreting cells.

Accepted Answer

B

Question 38

38 The diagram shows some of the processes that are involved in the cycling of nitrogen in an ecosystem. atmospheric nitrogen nitrate X ammonium plant compounds protein Which type of bacterium is found at X? A decomposing B denitrifying C nitrifying D nitrogen fixing

Accepted Answer

C

Question 39

39 The diagram shows the flow of energy through a food chain. key sunlight energy loss 3000  kJm  2y  1 1 × 106 kJm  2y  1 green plants herbivore carnivore 27 000 kJm  2y  1 What percentage of the energy is used by the green plants for photosynthesis? A 0.03 % B 0.30 % C 2.70 % D 3.00 %

Accepted Answer

D

Question 40

40 A tree carries out photosynthesis and provides organic compounds for other organisms in a forest. It takes carbon dioxide from and returns oxygen to the atmosphere. It takes water from the soil into its roots and its leaves lose water to the atmosphere. Many other organisms live in the tree. Which term describes the tree? A niche B community C ecosystem D trophic level

Accepted Answer

C

Question paper16 pages

Mark scheme2 pages

Questions as text

Q1 · Which feature is found in both prokaryotic and plant cells?

Q2 · What leaves the nucleus through the pores in the nuclear envelope?

Q3 · The same plant cells were viewed by a student using an electron microscope and a light…

Q4 · The diagram shows an organelle drawn at a magnification of ×20 000

Q5 · When drawing a plan diagram of a transverse section of a dicotyledonous leaf, which…

Q6 · What is the general formula for starch?

Q7 · Which bonds are the last to break when an enzyme is heated?

Q8 · Which molecules have a structural formula that contains C=O bonds?

Q9 · Which of the statements about polysaccharides can be used to describe both starch and…

Q10 · Five biochemical tests were carried out on four unknown substances, A, B, C and D

Q11 · What describes a globular protein that is not soluble in water?

Q12 · Polymers of molecule X or polymers of molecule Y can be formed using glycosidic bonds

Q13 · The diagrams show where an inhibitor becomes attached to an enzyme and whether this is…

Q14 · The diagrams show two molecules found in cell surface membranes

Q15 · The graph shows how the rate of entry of glucose into a cell changes as the concentration…

Q16 · The following are all processes by which substances can enter cells

Q17 · Which diagram represents a cell undergoing metaphase of mitosis?

Q18 · Colchicine is a substance which inhibits the formation of spindle fibres

Q19 · The sequence of nucleotides in DNA in a gene that controls the synthesis of a protein is…

Q20 · Enzymes are ……1…… proteins, made up of polypeptides

Q21 · Which process does not occur during the formation of messenger RNA?

Q22 · Which correctly matches the structure and function of sieve tube elements?

Q23 · How do single-celled organisms survive without a specialised transport system?

Q24 · The photomicrograph shows a transverse section of a leaf

Q25 · What occurs during the movement of water through the apoplast pathway?

Q26 · Why does the red blood cell count of humans increase when they remain at high altitudes?

Q27 · Which row correctly shows all the blood vessels that have the features in the table below?

Q28 · The graph shows the dissociation of oxygen from haemoglobin at two different pHs

Q29 · The diagram shows changes in pressure in the left side of the heart during the cardiac…

Q30 · When a person suffers an asthma attack, the tubes of the gas exchange system narrow and…

Q31 · Which symptoms may be seen in a person affected by chronic obstructive pulmonary disease…

Q32 · Which row shows the effects of chronic bronchitis?

Q33 · An oxygen molecule diffuses directly from the air in an alveolus to haemoglobin in a red…

Q34 · For some diseases, one of the most effective measures for prevention and control is…

Q35 · A child is vaccinated against a viral disease

Q36 · Why has it proved difficult to develop an effective vaccine against malaria?

Q37 · Which statement describes a role of lymphocytes in the immune response?

Q38 · The diagram shows some of the processes that are involved in the cycling of nitrogen in…

Q39 · The diagram shows the flow of energy through a food chain

Q40 · A tree carries out photosynthesis and provides organic compounds for other organisms in a…

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