Cambridge A Level Biology 9700 — 2013 Oct/Nov Paper 1 · Variant 1

Question 1

1 Which cell structure can be seen only with an electron microscope? A cell wall B chromosome C nucleolus D ribosome

Accepted Answer

D

Question 2

2 Which statement is not correct in its description of a light microscope or an electron microscope? A A light microscope has a maximum resolution of 0.2 µm. B An electron microscope has a maximum resolution of 0.05 nm. C A light microscope can resolve specimens as small as 200 nm in diameter. D An electron microscope can resolve specimens as small as 0.5 nm in diameter.

Accepted Answer

B

Question 3

3 The electronmicrograph shows part of an animal cell. What will be synthesised in large quantities in this cell? 1 ATP 2 glucose 3 RNA A 1 only B 2 only C 1 and 3 only D 1, 2 and 3

Accepted Answer

C

Question 4

4 Which statements about a typical eukaryotic cell are correct? 1 It is smaller than 2 µm. 2 It has a nucleolus. 3 It has linear DNA. 4 It only has small (70S) ribosomes. A 1 and 2 only B 1 and 4 only C 2 and 3 only D 3 and 4 only

Accepted Answer

C

Question 5

5 Which animal cells would have the most Golgi apparatus? A ciliated epithelial cells B goblet cells C red blood cells D smooth muscle cells

Accepted Answer

B

Question 6

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

Accepted Answer

C

Question 7

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

Accepted Answer

A

Question 8

8 Collagen is a macromolecule with three polypeptides lying closely side by side in the form of a triple helix. Every third amino acid in each polypeptide has the shortest possible R-group or side chain (– H) to allow close packing of the polypeptides. Which is the amino acid? A glucose B glycerol C glycine D guanine

Accepted Answer

C

Question 9

9 The diagrams show the structures of two amino acids, each of which has two amine (–NH2) groups. 1 2 4 5 H2N CH COOH H2N CH COOH CH2 CH2 3 C CH2 O NH2 6 C O NH2 A peptide bond is formed between the two amino acids. Which groups form the peptide bond? A 1 and 4 B 1 and 5 C 2 and 6 D 3 and 5

Accepted Answer

B

Question 10

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

Accepted Answer

D

Question 11

11 Which statements about competitive inhibitors of enzyme action are correct? 1 Increasing the concentration of the enzyme’s substrate will reduce their effect. 2 They bind to an enzyme at its active site. 3 They reduce the activation energy required for a reaction to take place. 4 They reduce the maximum rate of reaction. A 1 and 2 only B 1 and 3 only C 2 and 3 only D 2, 3 and 4 only

Accepted Answer

A

Question 12

12 An enzyme is completely denatured at 50 °C. A fixed concentration of this enzyme is added to a fixed concentration of its substrate. The time taken for completion of the reaction is measured at different temperatures. Which graph shows the results? A B time taken time taken for completion for completion of the reaction of the reaction 10 20 30 40 50 60 10 20 30 40 50 60 temperature / °C temperature / °C C D time taken time taken for completion for completion of the reaction of the reaction 10 20 30 40 50 60 10 20 30 40 50 60 temperature / °C temperature / °C

Accepted Answer

A

Question 13

13 Molecules 1, 2 and 3 are found in cell surface membranes. 1 glycolipids 2 glycoproteins 3 phospholipids Which contribute to cell recognition? A 2 only B 1 and 2 only C 1 and 3 only D 2 and 3 only

Accepted Answer

B

Question 14

14 What are the features of facilitated diffusion?

uses proteins

molecules move down a

in membrane uses ATP concentration gradient
A v v v
B x v v
Cc v x v
D v v x

key:
JY correct

X incorrect

Accepted Answer

C

Question 15

15 The stalk of a dandelion flower is a hollow tube. Pieces of the stalk are cut as shown and placed in sucrose solutions of different water potentials. thick walled outer cells hollow centre of stalk cuts thin walled inner cells Which diagram shows the piece that is placed in the sucrose solution with the highest water potential? A B C D

Accepted Answer

A

Question 16

16 What happens to an animal cell when it is placed in a solution with a more negative water potential? A It loses solutes to the solution and swells. B It loses water by osmosis and shrinks. C It takes in solutes and swells. D It takes in water by osmosis and bursts.

Accepted Answer

B

Question 17

17 Exposure to which of the following increases the risk of developing a cancerous growth?

ultraviolet viruses carbon X-rays
light monoxide y
v x key

JY increases risk

Jv Jv
x Jv X does not increase risk
Jv Jv

Accepted Answer

A

Question 18

18 The diagram shows an outline of the process of sexual reproduction. adult cell adult cell 1 1 gamete P gamete fertilisation Q zygote 2 fetus Which row identifies the type of cell division occurring during stages 1 and 2 and the number of chromosomes in cells P and Q? 1 2 P Q A meiosis meiosis diploid haploid B meiosis mitosis haploid diploid C mitosis meiosis haploid diploid D mitosis mitosis diploid haploid

Accepted Answer

B

Question 19

19 A short piece of DNA 19 base pairs long was analysed to find the number of nucleotide bases in each of the polynucleotide strands. Some of the results are shown below. number of nucleotide bases A C G T strand 1 4 strand 2 7 5 How many nucleotides containing C were present in strand 1? A 2 B 3 C 5 D 7

Accepted Answer

B

Question 20

20 Which statements about complementary base pairing are correct? 1 Cytosine forms two hydrogen bonds with guanine. 2 Purines and pyrimidines are different sizes. 3 Adenine forms the same number of hydrogen bonds with thymine and uracil. 4 The base pairs are of equal length. A 1, 2 and 3 only B 1, 2 and 4 only C 1, 3 and 4 only D 2, 3 and 4 only

Accepted Answer

D

Question 21

21 What does the enzyme DNA polymerase synthesise in a cell? A a polypeptide using DNA as a template B a strand of DNA using a polypeptide as a template C a strand of DNA using DNA as a template D a strand of mRNA using DNA as a template

Accepted Answer

C

Question 22

22 The statements describe some of the properties of water. 1 requires a lot of heat energy to evaporate 2 retains a lot of heat energy 3 is able to form hydrogen bonds with other water molecules 4 is able to form hydrogen bonds with other polar and non-polar molecules Which properties are important for transport in xylem? A 1, 2 and 3 only B 1, 2 and 4 only C 1 and 3 only D 3 and 4 only

Accepted Answer

D

Question 23

23 Which row is correct? needs energy from transfers heat energy carries assimilates ATP A translocation mass flow xylem vessel element B translocation transpiration phloem sieve tube element C transpiration mass flow xylem vessel element D transpiration translocation phloem sieve tube element

Accepted Answer

B

Question 24

24 Which feature of xylem vessel elements allows them to have reduced resistance to water movement? A lignin forms an incomplete secondary wall B new vessels carry extra water as a plant grows C there are no cross walls between vessel elements D vessel elements join to form narrow tubes

Accepted Answer

C

Question 25

25 An investigation was carried out into the effect of light intensity on the rate of transpiration. All other variables were standardised. A student was asked to explain the results shown in the graph below. 30 25 20 transpiration rate / cm3 h –1 15 10 5 0 0 10 20 30 40 light intensity / arbitrary units (au) Which explanation is correct? A At light intensities above 30 au the stomata close rapidly. B The rate of transpiration increases as the light intensity increases. C The rate of transpiration never falls to 0 cm3 because some stomata are always open. D Water uptake by the plant increases as the light intensity increases from 0 to 30 au.

Accepted Answer

A

Question 26

26 Different substances, such as sucrose and amino acids, can move in different directions in the phloem sieve tubes. Which statement explains this? A Active transport occurs in some phloem sieve tubes and mass flow occurs in other phloem sieve tubes. B Both active transport and mass flow occur in each individual phloem sieve tube. C Mass flow occurs in both directions at the same time in each individual phloem sieve tube. D Mass flow occurs in different directions in different phloem sieve tubes at the same time.

Accepted Answer

D

Question 27

27 Which reactions will be taking place in blood that is passing through active tissues? 1 HbO8  →  Hb  +  4O2 2 HbO8  +  H+  →  HHb  +  4O2 3 HCO3 –  +  H+  →  H2CO3 4 H2O  +  CO2  →  H2CO3 A 1, 2, 3, and 4 B 1, 2 and 4 only C 1, 3 and 4 only D 2 and 3 only

Accepted Answer

B

Question 28

28 During a cardiac cycle, the pressure in the right ventricle is lower than that in the right atrium and lower than that in the pulmonary artery. Which row is correct? atrioventricular semilunar valve valve A closed closed B closed open C open closed D open open

Accepted Answer

C

Question 29

29 What correctly describes an event in the cardiac cycle that follows atrial systole? A A wave of excitation passes through the sinoatrial node (SAN), before spreading down to the base of the septum. B Electrical impulses pass from the muscles of the atria to the muscles of the ventricles to cause ventricular systole. C Electrical impulses pass through conducting fibres, which cause a delay before spreading to Purkyne tissue. D The opening and closing of the semilunar valves occurs later than the opening and closing of the atrioventricular valves.

Accepted Answer

C

Question 30

30 ‘Heart block’ is a disease which can result in a lower than normal heart rate. A doctor treating a patient suffering from heart block found that electrical impulses were initiated as normal but were not correctly conducted to the ventricles, so the rate of ventricular contraction was slowed. Which may be functioning incorrectly in the patient? 1 atrioventricular node (AVN) 2 Purkyne tissue 3 sinoatrial node (SAN) A 1 and 2 only B 1 and 3 only C 2 and 3 only D 3 only

Accepted Answer

A

Question 31

31 What correctly describes the effect of carcinogens on lung tissue? A Cells of the alveoli walls divide more rapidly than normal by reduction division causing a tumour to develop. B Cilia are paralysed and mucus accumulates in the lungs, causing DNA to change and a tumour to develop. C DNA changes, causing bronchial epithelial cells to divide by mitosis in an uncontrolled way, causing a tumour to develop. D Haemoglobin carries less oxygen, causing bronchial cells to divide by mitosis in an uncontrolled way, causing a tumour to develop.

Accepted Answer

C

Question 32

32 A disease damages alveoli walls. What effect does this have on the gas exchange surface area and on the volume of the lungs? surface area volume A decreased decreased B decreased increased C decreased no change D no change no change

Accepted Answer

C

Question 33

33. Which is a correct description of part of the gas exchange system?

part of gas
exchange
system

cartilage

ciliated
epithelium

goblet cells

smooth
muscle

0 Oo WwW >

alveolus
bronchus
bronchiole

trachea

\ & \ x

SK KK

<4 x

«x « & x

key
v present

X absent

Accepted Answer

B

Question 34

34 Which is correct for TB, measles and malaria? TB measles malaria causative causative causative transmission transmission transmission agent agent agent A bacteria air-borne virus air-borne protoctist insect vector B bacteria water-borne protoctist air-borne virus insect vector C virus air-borne bacteria water-borne protoctist insect vector D virus insect vector protoctist insect vector bacteria water-borne

Accepted Answer

A

Question 35

35 What do the causative agents of HIV/AIDS, malaria and TB have in common?

they have a cell they have they have
; they respire key
surface membrane genes ribosomes
¥ present in each
v v v

causative agent

X not present in
each causative
agent

0 Oo WwW PY
a CS

v x x
x v x
x v x

Accepted Answer

D

Question 36

36 The photomicrograph shows human blood, with three types of white cell labelled. T R S Which row correctly identifies these white cells? cell R cell S cell T A lymphocyte lymphocyte lymphocyte B lymphocyte phagocyte phagocyte C phagocyte lymphocyte phagocyte D phagocyte phagocyte lymphocyte

Accepted Answer

D

Question 37

37 What are the function(s) of T-lymphocytes during an immune response? 1 destroy infected body cells 2 differentiate into memory cells 3 secrete antibodies A 1 only B 3 only C 1 and 2 only D 2 and 3 only

Accepted Answer

C

Question 38

38 A student wrote down three statements about antibodies. 1 Their structure depends on peptide, hydrogen and disulfide bonds. 2 They are protein molecules with both tertiary and quaternary structure. 3 Four polypeptides provide four antigen binding sites. Which statements are true? A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

Accepted Answer

B

Question 39

39 An insect consumes 180 J of plant material. Of this, 95 J of energy is passed out in the insect’s faeces and 58 J is used for respiration. Which percentage of the energy, in the original plant material taken in by the insect, is converted into biomass? A 10 % B 15 % C 32 % D 47 %

Accepted Answer

B

Question 40

40 Decomposition of organic matter can cause the concentration of ammonia to rise in a fish tank. High concentrations of ammonia in the tank are toxic to fish. Bacteria may be added to remove the ammonia. Which type of bacteria should be added? A ammonifying B denitrifying C nitrifying D nitrogen-fixing

Accepted Answer

C

Question paper16 pages

Mark scheme2 pages

Questions as text

Q1 · Which cell structure can be seen only with an electron microscope?

Q2 · Which statement is not correct in its description of a light microscope or an electron…

Q3 · The electronmicrograph shows part of an animal cell

Q4 · Which statements about a typical eukaryotic cell are correct?

Q5 · Which animal cells would have the most Golgi apparatus?

Q6 · Which diagram shows the reaction that occurs to link two monomers that form cellulose?

Q7 · Which bonds will be broken when a molecule of glycogen is hydrolysed?

Q8 · Collagen is a macromolecule with three polypeptides lying closely side by side in the…

Q9 · The diagrams show the structures of two amino acids, each of which has two amine (–NH2)…

Q10 · Each list, 1, 2 and 3, shows some substances found in animal tissues

Q11 · Which statements about competitive inhibitors of enzyme action are correct?

Q12 · An enzyme is completely denatured at 50 °C

Q13 · Molecules 1, 2 and 3 are found in cell surface membranes

Q14 · What are the features of facilitated diffusion?

Q15 · The stalk of a dandelion flower is a hollow tube

Q16 · What happens to an animal cell when it is placed in a solution with a more negative water…

Q17 · Exposure to which of the following increases the risk of developing a cancerous growth?

Q18 · The diagram shows an outline of the process of sexual reproduction

Q19 · A short piece of DNA 19 base pairs long was analysed to find the number of nucleotide…

Q20 · Which statements about complementary base pairing are correct?

Q21 · What does the enzyme DNA polymerase synthesise in a cell?

Q22 · The statements describe some of the properties of water

Q23 · Which row is correct?

Q24 · Which feature of xylem vessel elements allows them to have reduced resistance to water…

Q25 · An investigation was carried out into the effect of light intensity on the rate of…

Q26 · Different substances, such as sucrose and amino acids, can move in different directions…

Q27 · Which reactions will be taking place in blood that is passing through active tissues?

Q28 · During a cardiac cycle, the pressure in the right ventricle is lower than that in the…

Q29 · What correctly describes an event in the cardiac cycle that follows atrial systole?

Q30 · ‘Heart block’ is a disease which can result in a lower than normal heart rate

Q31 · What correctly describes the effect of carcinogens on lung tissue?

Q32 · A disease damages alveoli walls

Q33 · Which is a correct description of part of the gas exchange system?

Q34 · Which is correct for TB, measles and malaria?

Q35 · What do the causative agents of HIV/AIDS, malaria and TB have in common?

Q36 · The photomicrograph shows human blood, with three types of white cell labelled

Q37 · What are the function(s) of T-lymphocytes during an immune response?

Q38 · A student wrote down three statements about antibodies

Q39 · An insect consumes 180 J of plant material

Q40 · Decomposition of organic matter can cause the concentration of ammonia to rise in a fish…

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