Cambridge A Level Biology 9700 — 2012 Oct/Nov Paper 1 · Variant 2

Question 1

1 Which eyepiece and objective lens combination of a light microscope enables you to see the greatest number of cells in the field of view? eyepiece lens objective lens A ×5 ×10 B ×5 ×40 C ×10 ×10 D ×10 ×40

Accepted Answer

A

Question 2

2 What are the characteristics of a prokaryotic cell? endoplasmic reticulum genetic material A absent DNA B absent RNA C present DNA D present RNA

Accepted Answer

A

Question 3

3 The following are all features of eukaryotic cells. 1 chloroplast 2 Golgi apparatus 3 lysosome 4 mitochondrion 5 nucleus Which of these has a single membrane? A 1 and 2 B 2 and 3 C 3 and 4 D 4 and 5

Accepted Answer

B

Question 4

4 Plant cells are fixed, stained and viewed through a light microscope. What would be clearly visible at x400 magnification? A cristae of mitochondria B grana of chloroplasts C nucleoli D ribosomes

Accepted Answer

C

Question 5

5 Which size range would include most prokaryotic cells? A B C D 1 nm 100 nm 1 µm 100 µm 1 mm

Accepted Answer

B

Question 6

6 The photomicrograph shows some plant tissues and the magnification is ×200. Z What is the diameter of the cell marked Z? A 5 µm B 10 µm C 50 µm D 100 µm

Accepted Answer

C

Question 7

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

Accepted Answer

B

Question 8

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

Accepted Answer

B

Question 9

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

Accepted Answer

B

Question 10

10 Haemoglobin consists of two α chains and two β chains. Approximately 5 % of all humans have one amino acid in the β chain different from normal. Which level(s) of protein structure could be changed in these humans? A primary only B primary and quaternary only C primary, secondary and tertiary only D quaternary only

Accepted Answer

C

Question 11

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

Accepted Answer

D

Question 12

12 Which row shows the types of bond found at different levels of protein structures?

bonds
level of protein
structure peptide | hydrogen | ionic | hydrostatic
A primary J x x v
B secondary Xx v v x
Cc tertiary x v v v
D quaternary v x v v

key
Jv = present
X = absent

Accepted Answer

C

Question 13

13 What is the role of enzymes in metabolism? A to catalyse the hydrolysis of large molecules only B to increase the number of collisions between molecules C to lower the activation energy required to start a reaction D to supply the activation energy required to start a reaction

Accepted Answer

C

Question 14

14 Two enzyme experiments were carried out. The first, experiment X, was carried out at a constant temperature of 37 oC. During the second experiment the temperature was increased from 37 oC to 80 oC. All other factors were kept the same. Which graph shows the results? A B X X product product concentration concentration time time C D X product X product concentration concentration time time

Accepted Answer

A

Question 15

15 Which role of the cell surface membrane is not a result of the properties of the phospholipids? A to allow cytokinesis to occur in mitotic cell division B to allow entry and exit of the water-soluble gases, oxygen and carbon dioxide C to allow phagocytosis of a bacterium into cells D to allow surface membranes to stabilise by binding with water molecules

Accepted Answer

D

Question 16

16 An increase in which component would make the cell surface membrane more fluid? A cholesterol B glycolipids C glycoproteins D proteins

Accepted Answer

A

Question 17

17 Which processes that move substances across cell surface membranes result in an equilibrium? 1 active transport 2 diffusion 3 facilitated diffusion 4 osmosis 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 18

18 Diagrams 1 and 2 show how the transverse section through a leaf changes when moved from one solution W to a different solution Y. X X W Y diagram 1 diagram 2 How has the water potential changed in diagram 2? difference in cells at X in solution Y compared to difference in solution Y the same cells in compared to solution W solution W A less negative less negative B less negative more negative C more negative less negative D more negative more negative

Accepted Answer

A

Question 19

19 Immediately after which stage in mitosis in an animal cell does the cytoplasm start to divide? A anaphase B metaphase C prophase D telophase

Accepted Answer

D

Question 20

20 The diagram shows a cell of an organism formed by reduction division. What is the diploid number for this organism? A 10 B 20 C 40 D 46

Accepted Answer

C

Question 21

21 Which is not a description of a gene? A a length of DNA which carries coded information as a sequence of nucleotides that can result in the formation of a polypeptide chain B any section of a molecule that has two strands, each with a sequence of nucleotides that are complementary to each other and are held together by hydrogen bonding C a sequence of nucleotides which can be copied by complementary base pairing and then be translated at a ribosome D a sequence of nucleotides that can be transcribed using a polymerase enzyme and free activated nucleotides and which results in the formation of a messenger RNA molecule

Accepted Answer

B

Question 22

22 Which row in the table correctly shows situations in which both DNA and RNA are both involved?

replication | transcription | translation

v v x key

JY involved

0 0O DW >

Jv x Jv
x Jv x X not involved
x x Jv

Accepted Answer

C

Question 23

23 The diagram shows the stages in the production of a polypeptide. DNA nucleotide sequence template strand T A C G A C A A T C G C mRNA sequence A U G C U G U U A G C G amino acid sequence met     leu     leu      ala Which feature of the triplet code is illustrated by the information given? A An amino acid can be coded for by more than one triplet. B The triplet code is non-overlapping and is only read in one direction. C The triplet code is universal for the DNA of all organisms. D There are some triplets that code for ‘start’ and ‘stop’.

Accepted Answer

A

Question 24

24 What is correct about the uptake and transport of water in plants? 1 water transported by the symplast pathway enters root hair cells down a water potential gradient 2 water is transported in xylem by the symplast and apoplast pathways to reach the leaves 3 water transported by the apoplast pathway through plasmodesmata must pass through cell surface membranes of endodermal cells A 1 only B 3 only C 1 and 3 only D 2 and 3 only

Accepted Answer

A

Question 25

25 Which combination of conditions increases the rate of transpiration in plants? light intensity humidity temperature A high high low B high low high C low high low D low low high

Accepted Answer

B

Question 26

26 Which statement explains why sucrose, rather than glucose, is transported by phloem? A Sucrose can pass through plant cell surface membranes more easily. B Sucrose is a disaccharide and is more easily converted to starch. C Sucrose is a larger molecule. D Sucrose is a non-reducing sugar, so is less reactive.

Accepted Answer

D

Question 27

27 The diagrams show transverse sections of parts of a plant. leaf stem root 3 1 4 5 6 2 In the transverse sections, what do 1, 2, 3, 4, 5 and 6 represent? leaf stem root phloem xylem phloem xylem phloem xylem A 1 2 3 4 5 6 B 1 2 4 3 6 5 C 2 1 3 4 5 6 D 2 1 4 3 6 5

Accepted Answer

C

Question 28

28 The diagram shows the effect of three different concentrations of carbon dioxide on the oxygen dissociation curve for human haemoglobin. 100 X X = partial pressure of Y carbon dioxide: 3.0 kPa percentage saturation of Z Y = partial pressure of haemoglobin carbon dioxide: 5.0 kPa with oxygen Z = partial pressure of carbon dioxide: 7.0 kPa 0 0 12 partial pressure of oxygen / kPa What effect does carbon dioxide have on haemoglobin? A it makes it less efficient at taking up oxygen and also less efficient at releasing it B it makes it less efficient at taking up oxygen and more efficient at releasing it C it makes it more efficient at taking up oxygen and also more efficient at releasing it D it makes it more efficient at taking up oxygen and less efficient at releasing it

Accepted Answer

B

Question 29

29 Why does the number of red blood cells in a human increase after several weeks at high altitude? A red blood cells are short-lived B there is a high partial pressure of oxygen C to remove glucose from the tissues D to supply the tissues with enough oxygen

Accepted Answer

D

Question 30

30 The graph shows the pressure changes in the left atrium, left ventricle and aorta during a cardiac cycle. 2 1 pressure key / kPa left ventricle aorta 3 4 left atrium 0 0 0.2 0.4 0.6 0.8 time / s With reference to the semilunar valve and atrioventricular valve, what is happening at points 1, 2, 3 and 4? semilunar valve atrioventricular valve opens closes opens closes A 1 2 3 4 B 1 2 4 3 C 2 3 1 4 D 2 3 4 1

Accepted Answer

B

Question 31

31 Normal venous pressure in the feet is 3.3 kPa. When a person stands very still venous blood pressure in the feet rises to 5.0 kPa. What causes the high pressure? A Muscles in the walls of the veins contract, reducing the diameter of the veins. B Skeletal muscles in the legs are not squeezing blood upward in the veins. C Systolic blood pressure increases. D The valves in the veins of the legs allow blood to flow to the feet.

Accepted Answer

B

Question 32

32 Some people find it difficult to breath out large volumes of air from their lungs. Their breathing is noisy and rapid. Which disease are they likely to be suffering from? A atherosclerosis B coronary heart disease C emphysema D lung cancer

Accepted Answer

C

Question 33

33 Which of the following can result in heart failure? 1 increase in blood pressure 2 deposits of fatty material in arteries and veins 3 reduced oxygen supply to cardiac muscle 4 increased risk of blood clotting A 3 and 4 only B 1, 2 and 3 only C 1, 2 and 4 only D 1, 3 and 4 only

Accepted Answer

D

Question 34

34 An adult human has approximately 5 dm3 of blood, which circulates about once a minute. 100 cm3 of arterial blood carries 19 cm3 of oxygen. 100 cm3 of venous blood carries 12.5 cm3 of oxygen. What is the approximate volume in cm3 of oxygen taken up per minute in the lungs? A 32.5 B 65 C 325 D 950

Accepted Answer

C

Question 35

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

Accepted Answer

A

Question 36

36 To prevent a disease, dead bacteria may be injected into the body. What type of immune response is produced? natural active A no no B no yes C yes no D yes yes

Accepted Answer

B

Question 37

37 The graph shows the primary and secondary responses of the immune system to antigens. X concentration of antibodies in plasma Y 0 1 2 3 4 5 weeks after first or second exposure to antigen What are responses X and Y? X Y A primary response secondary response caused by cloning of B–lymphocytes formed during the primary response B primary response secondary response caused by cloning of T–lymphocytes formed during the primary response C secondary response caused by cloning primary response of B–lymphocytes formed during the primary response D secondary response caused by cloning primary response of T–lymphocytes formed during the primary response

Accepted Answer

C

Question 38

38 A primary consumer, X, is removed from a community due to a lethal viral infection. After a time, the size of the populations of some of the organisms shown in the food web changed. Which population of organisms increased? A B C D primary consumer X primary producer

Accepted Answer

C

Question 39

39 The diagram shows a simplified nitrogen cycle. During which stage does nitrification take place? nitrogen in atmosphere A plant animal proteins proteins D death and decay B ammonium compounds C nitrites nitrates

Accepted Answer

C

Question 40

40 The total rate at which producers synthesise organic material is called gross primary productivity (GPP). The rate at which producers store organic material as new tissue is called net primary productivity (NPP). What shows the relationship between GPP and NPP? A NPP = GPP × respiration B NPP = GPP ÷ respiration C NPP = GPP + respiration D NPP = GPP – respiration

Accepted Answer

D

Question paper16 pages

Mark scheme2 pages

Questions as text

Q1 · Which eyepiece and objective lens combination of a light microscope enables you to see…

Q2 · What are the characteristics of a prokaryotic cell?

Q3 · The following are all features of eukaryotic cells

Q4 · Plant cells are fixed, stained and viewed through a light microscope

Q5 · Which size range would include most prokaryotic cells?

Q6 · The photomicrograph shows some plant tissues and the magnification is ×200

Q7 · Heating with which solution breaks glycosidic bonds?

Q8 · The diagram shows four molecules

Q9 · Which molecules have a structural formula that contains C=O bonds?

Q10 · Haemoglobin consists of two α chains and two β chains

Q11 · Which of the statements about polysaccharides can be used to describe both glycogen and…

Q12 · Which row shows the types of bond found at different levels of protein structures?

Q13 · What is the role of enzymes in metabolism?

Q14 · Two enzyme experiments were carried out

Q15 · Which role of the cell surface membrane is not a result of the properties of the…

Q16 · An increase in which component would make the cell surface membrane more fluid?

Q17 · Which processes that move substances across cell surface membranes result in an…

Q18 · Diagrams 1 and 2 show how the transverse section through a leaf changes when moved from…

Q19 · Immediately after which stage in mitosis in an animal cell does the cytoplasm start to…

Q20 · The diagram shows a cell of an organism formed by reduction division

Q21 · Which is not a description of a gene?

Q22 · Which row in the table correctly shows situations in which both DNA and RNA are both…

Q23 · The diagram shows the stages in the production of a polypeptide

Q24 · What is correct about the uptake and transport of water in plants?

Q25 · Which combination of conditions increases the rate of transpiration in plants?

Q26 · Which statement explains why sucrose, rather than glucose, is transported by phloem?

Q27 · The diagrams show transverse sections of parts of a plant

Q28 · The diagram shows the effect of three different concentrations of carbon dioxide on the…

Q29 · Why does the number of red blood cells in a human increase after several weeks at high…

Q30 · The graph shows the pressure changes in the left atrium, left ventricle and aorta during…

Q31 · Normal venous pressure in the feet is 3.3 kPa

Q32 · Some people find it difficult to breath out large volumes of air from their lungs

Q33 · Which of the following can result in heart failure?

Q34 · An adult human has approximately 5 dm3 of blood, which circulates about once a minute

Q35 · Which of the following increases the risk of contracting measles?

Q36 · To prevent a disease, dead bacteria may be injected into the body

Q37 · The graph shows the primary and secondary responses of the immune system to antigens

Q38 · A primary consumer, X, is removed from a community due to a lethal viral infection

Q39 · The diagram shows a simplified nitrogen cycle

Q40 · The total rate at which producers synthesise organic material is called gross primary…

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