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

Question 1

1 The diagram is a drawing from an electron micrograph of a cell. Which structure indicates that this is a secretory cell? A B C D

Accepted Answer

B

Question 2

2 Four students were asked to suggest a set of four labels to add to a plan diagram of a transverse section of a dicotyledonous leaf. Which student, A, B, C or D, suggested a correct set of labels? label 1 label 2 label 3 label 4 A lower phloem spongy palisade epidermis mesophyll mesophyll B phloem sieve upper spongy xylem vessel tubes epidermis mesophyll elements C spongy endodermis xylem vessel palisade mesophyll elements mesophyll D waxy cuticle xylem companion spongy cells mesophyll

Accepted Answer

A

Question 3

3 Which of the following are found in both eukaryotic and prokaryotic cells? 1 cellulose 2 deoxyribose 3 lipids 4 ribose A 1, 2 and 3 B 1, 2 and 4 C 1, 3 and 4 D 2, 3 and 4

Accepted Answer

D

Question 4

4 Which row correctly identifies all the locations of ribosomes in a eukaryotic cell?

attached to

free in in attached to
cytoplasm | mitochondria ER amelone in nucleus
A Jv V V V y
B WA x V x x
Cc x V x V y
D x x V V x

key
/¥ = present
X = absent

Accepted Answer

A

Question 5

5 Which statement about the light microscope is correct? A As the smallest distance to see two points as distinct separate points decreases, the resolution also decreases. B If the resolution is 220 nm, then a bacterium 0.2 µm in diameter will not be visible. C If the wavelength of light is 600 nm, then two membranes 300 nm apart will be visible as two distinct membranes. D Using visible light of a longer wavelength, such as red light, will improve the resolution.

Accepted Answer

B

Question 6

6 The diagram shows the ultrastructure of a cell from a dicotyledonous leaf. 5 µm What is the magnification? A × 280 B × 2800 C × 3570 D × 7000

Accepted Answer

B

Question 7

7 Four students, 1, 2, 3 and 4, each carried out the reducing sugar test and the non-reducing sugar test on a sucrose solution. Which observations demonstrate that they carried out the correct tests? observations for reducing observations for non- student sugar test reducing sugar test 1 no colour change changed colour 2 no colour change red 3 blue changed colour 4 blue red A 2 only B 3 only C 4 only D 1, 2, 3 and 4

Accepted Answer

C

Question 8

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

Accepted Answer

D

Question 9

9 Which of the bonds will be last to break as the temperature of an enzyme is increased? A covalent B hydrogen C hydrophobic interactions D ionic

Accepted Answer

A

Question 10

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

Accepted Answer

C

Question 11

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.

Accepted Answer

D

Question 12

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

Accepted Answer

A

Question 13

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

Accepted Answer

B

Question 14

14 What is the effect of an enzyme in an enzyme-catalysed reaction? A decreases both the activation energy and the energy yield B decreases the activation energy and has no effect on the energy yield C increases both the activation energy and the energy yield D increases the energy yield and decreases the activation energy

Accepted Answer

B

Question 15

15 The diagram represents the fluid mosaic model of membrane structure. 3 2 1 4 6 5 Which two components contribute to the fluidity of the membrane? A 1 and 3 B 2 and 4 C 3 and 5 D 4 and 6

Accepted Answer

D

Question 16

16 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? A All the carrier proteins are saturated with glucose. B The carrier proteins are denatured and no longer able to function. C The cell has used up its supply of ATP. D The concentrations of glucose inside and outside the cell are equal.

Accepted Answer

A

Question 17

17 A molecule can enter a cell by two different passive processes. Which process would increase the rate at which this molecule enters the cells? A diffusion B endocytosis C facilitated diffusion D osmosis

Accepted Answer

C

Question 18

18 Which statement is incorrect for mitotic cell division? A DNA is replicated semi-conservatively during mitosis. B DNA is normally unchanged from one generation of cells to the next. C The daughter cells have the potential to produce the same enzymes as the parent cell. D The same quantity of DNA is distributed to the nuclei of two new cells.

Accepted Answer

A

Question 19

19 The diagram shows the chromosomes of one cell which has been squashed during mitosis. Which stage of mitosis is shown and what is the haploid chromosome number in this species? haploid chromosome stage of mitosis number A anaphase 5 B anaphase 10 C metaphase 5 D metaphase 10

Accepted Answer

C

Question 20

20 What does the process of translation require? A DNA, free nucleotide bases and mRNA B DNA, mRNA and RNA polymerase C mRNA, ribosomes and RNA polymerase D mRNA, ribosomes and tRNA

Accepted Answer

D

Question 21

21 Which features of DNA enable it to meet these requirements as a molecule of inheritance? requirement of DNA molecule ability to remain ability to contain ability to transfer ability to replicate stable information information A complementary formation of mRNA sequence of sugar-phosphate base pairing for translation nucleotides backbone B formation of mRNA complementary sugar-phosphate sequence of for translation base pairing backbone nucleotides C sequence of sugar-phosphate complementary formation of mRNA nucleotides backbone base pairing for translation D sugar-phosphate sequence of formation of mRNA complementary backbone nucleotides for translation base pairing

Accepted Answer

D

Question 22

22 Which diagram shows the bond linking the individual units of a nucleic acid? A B C D H C O C C C O C C N C C C O P O C O O

Accepted Answer

C

Question 23

23 Which row correctly identifies xylem vessel elements and sieve tube elements?

xylem vessel element sieve tube element

cytoplasm | nucleus | cytoplasm | nucleus

Jv v x x key

J/ = present

0 0N0 WwW >

x J x x
x x Jv Jv X = absent
x x Jv x

Accepted Answer

D

Question 24

24 The diagram shows a model which can be used to demonstrate mass flow. tube T concentrated X Y dilute sucrose sucrose solution solution water rigid partially permeable containers X and Y are filled with sucrose solutions of different concentrations, causing water to move in or out of X and Y by osmosis or as a result of hydrostatic pressure. Sucrose solution then moves through tube T joining X and Y. Which description is correct? water potential in X direction of movement of compared with Y sucrose solution in tube T A less negative from X to Y B less negative from Y to X C more negative from X to Y D more negative from Y to X

Accepted Answer

C

Question 25

25 Which of the following statements explain why a stem is both cut and connected to a potometer under water? 1 To prevent plasmolysis of xylem vessel elements 2 To prevent the collapse of xylem vessel elements 3 To prevent air entering xylem vessel elements A 1 only B 3 only C 2 and 3 only D 1, 2 and 3

Accepted Answer

B

Question 26

26 What happens during ventricular systole in a mammalian heart? A aortic pressure increases B atrioventricular valves open C semilunar valves close D ventricular pressure decreases

Accepted Answer

A

Question 27

27 Which two statements about the Bohr effect are correct? 1 Increasing the partial pressure of oxygen increases the percentage of oxyhaemoglobin. 2 Decreasing the partial pressure of carbon dioxide decreases the percentage of oxyhaemoglobin. 3 Increasing the partial pressure of carbon dioxide shifts the dissociation curve of haemoglobin to the left. 4 In low concentrations of carbon dioxide haemoglobin has a high affinity for oxygen. A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

Accepted Answer

B

Question 28

28 The diagram shows the heart and some of its blood vessels. 2 3 4 1 Which combination of numbers correctly identifies the blood vessels that supply blood to the heart and carry blood from the heart? to the heart from the heart A 1 and 2 3 and 4 B 2 and 3 1 and 4 C 3 and 4 1 and 2 D 4 and 1 2 and 3

Accepted Answer

D

Question 29

29 The diagram shows pressure changes in the left side of the heart during the cardiac cycle. pressure key / kPa left ventricle aorta X left atrium 0 0 0.2 0.4 0.6 0.8 time / s What happens at X? A atrioventricular valves close B atrioventricular valves open C semilunar valves close D semilunar valves open

Accepted Answer

A

Question 30

30 The photograph shows a type of blood cell. Which statements about these cells are correct? 1 Oxygen diffuses through the phospholipid bilayer. 2 Sodium ions diffuse through the phospholipid bilayer. 3 Water passes in and out of these cells by osmosis. 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 symptom is specific to emphysema? A excess mucus secretion by the goblet cells B inflammation of the bronchial epithelium C loss of elasticity of the alveolar walls D thickening of the smooth muscle of the bronchi

Accepted Answer

C

Question 32

32 Haemoglobin can bind to carbon dioxide, carbon monoxide and oxygen. 1 carbon dioxide 2 carbon monoxide 3 oxygen Which gases share a binding site? A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3

Accepted Answer

C

Question 33

33 Some studies suggest that smoking increases the risk of developing lung cancer. The two graphs show the percentage of smokers and the deaths from lung cancer in men of two age groups between 1950 and 1998. 500 80 400 smokers / 60 deaths per 300 percentage 100 000 of 40 age group 200 of age group 20 100 0 0 1950 1960 1970 1980 1990 2000 1950 1960 1970 1980 1990 2000 year year key men aged 35 – 59 years men aged 60 – 74 years Which statement is not supported by the data in the graphs? A Deaths from lung cancer in men aged 35-59 years decreased by 50 % over the period of the study. B Deaths from lung cancer in men aged 60-74 years increased up to 1970. C The data for men aged 60-74 years between 1950 to 1970 suggests that lung cancer takes up to 20 years to develop. D The number of men aged 35-59 years who were smokers decreased by approximately 60 % over the period of the study.

Accepted Answer

D

Question 34

34 Which row correctly matches a function with B-lymphocytes and T-lymphocytes?

function

B-lymphocytes

T-lymphocytes

0 0O WwW >

may become plasma cells
may secrete antibodies
provides a cell-mediated response

provides a humoral response

x

x
v
v

x

v
v
x

key
JY true

Xx false

Accepted Answer

D

Question 35

35 What happens when people are injected with dead bacteria? A B-lymphocytes produce antibodies. B B- lymphocytes produce antigens. C T- lymphocytes produce antibodies. D T- lymphocytes produce antigens.

Accepted Answer

A

Question 36

36 Some children are born with Severe Combined Immune Deficiency (SCID). These children do not normally have any T-lymphocytes and suffer from many diseases. How may these children be cured? A bone marrow transplantation B continual use of antibiotics C transfusion of antibodies D vaccination against all diseases

Accepted Answer

A

Question 37

37 Which of the following increase the risk of contracting TB? 1 drinking unpasteurised milk 2 eating shellfish which have fed on raw sewage 3 living in overcrowded conditions A 2 only B 1 and 2 C 1 and 3 D 2 and 3

Accepted Answer

C

Question 38

38 Which box encloses a community? A sunlight B organisms C soil D weather

Accepted Answer

B

Question 39

39 The diagram shows a simplified nitrogen cycle. Which arrow represents the activity of nitrogen-fixing bacteria? nitrogen in atmosphere A plant animal proteins proteins D death and decay B ammonium compounds nitrites C nitrates

Accepted Answer

A

Question 40

40 The diagram shows some values for gross primary productivity (GPP) and energy flow in an ecosystem, measured in kJ m–2 y–1. solar energy first trophic level 23 000 8000 second trophic level 10 500 third trophic level 4200 What percentage of GPP in the producers can be transferred to the tertiary consumers? A 1.3 % B 6.7 % C 18.3 % D 19.6 %

Accepted Answer

A

Question paper16 pages

Mark scheme2 pages

Questions as text

Q1 · The diagram is a drawing from an electron micrograph of a cell

Q2 · Four students were asked to suggest a set of four labels to add to a plan diagram of a…

Q3 · Which of the following are found in both eukaryotic and prokaryotic cells?

Q4 · Which row correctly identifies all the locations of ribosomes in a eukaryotic cell?

Q5 · Which statement about the light microscope is correct?

Q6 · The diagram shows the ultrastructure of a cell from a dicotyledonous leaf

Q7 · Four students, 1, 2, 3 and 4, each carried out the reducing sugar test and the…

Q8 · Which row is correct for each of the molecules?

Q9 · Which of the bonds will be last to break as the temperature of an enzyme is increased?

Q10 · Which pair of monosaccharides form sucrose?

Q11 · Which statement about triglycerides is correct?

Q12 · Which molecules contain C=O bonds?

Q13 · Which of the statements about polysaccharides can be used to describe both amylose and…

Q14 · What is the effect of an enzyme in an enzyme-catalysed reaction?

Q15 · The diagram represents the fluid mosaic model of membrane structure

Q16 · The graph shows how the rate of entry of glucose into a cell changes as the concentration…

Q17 · A molecule can enter a cell by two different passive processes

Q18 · Which statement is incorrect for mitotic cell division?

Q19 · The diagram shows the chromosomes of one cell which has been squashed during mitosis

Q20 · What does the process of translation require?

Q21 · Which features of DNA enable it to meet these requirements as a molecule of inheritance?

Q22 · Which diagram shows the bond linking the individual units of a nucleic acid?

Q23 · Which row correctly identifies xylem vessel elements and sieve tube elements?

Q24 · The diagram shows a model which can be used to demonstrate mass flow

Q25 · Which of the following statements explain why a stem is both cut and connected to a…

Q26 · What happens during ventricular systole in a mammalian heart?

Q27 · Which two statements about the Bohr effect are correct?

Q28 · The diagram shows the heart and some of its blood vessels

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

Q30 · The photograph shows a type of blood cell

Q31 · Which symptom is specific to emphysema?

Q32 · Haemoglobin can bind to carbon dioxide, carbon monoxide and oxygen

Q33 · Some studies suggest that smoking increases the risk of developing lung cancer

Q34 · Which row correctly matches a function with B-lymphocytes and T-lymphocytes?

Q35 · What happens when people are injected with dead bacteria?

Q36 · Some children are born with Severe Combined Immune Deficiency (SCID)

Q37 · Which of the following increase the risk of contracting TB?

Q38 · Which box encloses a community?

Q39 · The diagram shows a simplified nitrogen cycle

Q40 · The diagram shows some values for gross primary productivity (GPP) and energy flow in an…

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