Cambridge A Level Biology 9700 — 2011 Oct/Nov Paper 1 · Variant 1

Question 1

1 What is the diameter of a typical prokaryote, such as Streptococcus? A 7.5 × 101 nm B 7.5 × 102 nm C 7.5 × 100 µm D 7.5 × 101 µm

Accepted Answer

B

Question 2

2 Which cell components contain ribosomes? 1 chloroplast 2 mitochondrion 3 nucleus 4 cytoplasm A 1, 2, 3 and 4 B 1, 2 and 3 only C 1 and 2 only D 3 and 4 only

Accepted Answer

A

Question 3

3 Where would cristae be found in a cell? 1 endoplasmic reticulum 2 Golgi apparatus 3 mitochondrion A 1 and 2 B 1 and 3 C 2 and 3 D 3 only

Accepted Answer

D

Question 4

4 Which cell components are present in all prokaryotic cells?

cell surface endoplasmic
cell wall flagellum
membrane reticulum
A v v x v
B v Xx v x
Cc v v x x
D x v v v

key
J/ = present

X = not present

Accepted Answer

C

Question 5

5 The diagram shows a stage micrometer on which the small divisions are 0.1 mm. It is viewed through an eyepiece containing a graticule. 0 10 20 30 40 50 60 70 80 90 100 The stage micrometer is replaced by a slide of a plant cell. 0 10 20 30 40 50 60 70 80 90 100 What is the length of the nucleus? A 0.8 mm B 8 µm C 25 µm D 200 µm

Accepted Answer

C

Question 6

6 In general, eukaryotic cells undergo division much slower than prokaryotic cells. What is the reason for this? A Eukaryotes break down the nuclear membrane during mitosis. B Eukaryotes have many more mitochondria than prokaryotes. C Prokaryotes do not contain any centrioles. D Prokaryotic cells are a lot smaller than eukaryotic cells.

Accepted Answer

A

Question 7

7 Which is the strongest type of bonding found in proteins? A disulfide bonds B hydrogen bonds C hydrophobic interactions D ionic bonds

Accepted Answer

A

Question 8

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

Accepted Answer

A

Question 9

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

Accepted Answer

D

Question 10

10 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

Accepted Answer

C

Question 11

11 Which property of water makes it most suitable for transport in eukaryotic organisms? A density B ionisation C latent heat of vaporisation D solvent properties

Accepted Answer

D

Question 12

12 Which statements about the effect of all enzyme inhibitors are correct? 1 alter the shape of the active site 2 denature the enzyme 3 reduce the rate of the enzyme catalysed reaction A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 3 only

Accepted Answer

D

Question 13

13 The graph shows the effect of an enzyme on a reaction. transition state X energy of system Y substrate Z product time Which combination identifies X, Y and Z? X Y Z A catalysed reaction uncatalysed reaction energy lost by product B catalysed reaction uncatalysed reaction total energy lost during reaction C uncatalysed reaction catalysed reaction energy gained by product D uncatalysed reaction catalysed reaction total energy change during reaction

Accepted Answer

D

Question 14

14 Single-celled animals that live in fresh water have a vacuole that contracts regularly to remove excess water. Single-celled plants that live in fresh water do not have a similar vacuole. Which statement explains why only these animals need this vacuole? A Plant cell cytoplasm and animal cell cytoplasm both have a lower water potential than fresh water. B Plant cell sap has the same water potential as fresh water, animal cytoplasm has a lower water potential than fresh water. C Plant cell walls are impermeable to water, animal cell surface membranes are permeable to water. D Plant cell walls restrict the entry of water, animal cell membranes allow the free entry of water.

Accepted Answer

D

Question 15

15 Which statement defines active transport? A movement of large molecules through the cell surface membrane into the cytoplasm of a cell B movement of molecules or ions from where they are in a low concentration to where they are in a higher concentration C movement of molecules or ions from where they are in a high concentration to where they are in a lower concentration D net movement of water molecules across a partially permeable membrane from a region of higher water potential to one of lower water potential

Accepted Answer

B

Question 16

16 Which statements about the components of the cell surface membrane are correct? 1 Diffusion can take place through lipids and protein pores. 2 Endocytosis only involves lipids. 3 Facilitated diffusion only involves proteins. 4 Osmosis only involves proteins. A 1, 2, 3 and 4 B 1, 3 and 4 only C 1 and 3 only D 2 and 4 only

Accepted Answer

C

Question 17

17 Which statement about a diploid cell is not correct? A It can undergo a mitotic division to allow growth to occur. B It can undergo a mitotic division to repair a cell. C It can undergo a reduction division to form haploid cells. D It is one that possesses two complete sets of chromosomes.

Accepted Answer

B

Question 18

18 Meiosis and mitosis are two types of cell division. A cell has 10 chromosomes before it divides. How many chromosomes will it have after dividing by meiosis or mitosis? meiosis mitosis A 5 10 B 5 20 C 10 5 D 20 5

Accepted Answer

A

Question 19

19 A gene codes for the production of a protein, p53, that binds to damaged DNA during interphase and prevents its replication. A carcinogen in cigarette smoke mutates this gene. Which statement explains why this mutation may cause cancer? A Lack of p53 allows cells to undergo mitosis. B Lack of p53 allows cells with damaged DNA to replicate. C The carcinogen in cigarette smoke increases the rate of cell division. D The p53 causes uncontrolled cell division.

Accepted Answer

B

Question 20

20 In a genetic engineering experiment a piece of double-stranded DNA containing 6000 nucleotides coding for a specific polypeptide is transcribed and translated. What is the total number of amino acids in this polypeptide? A 500 B 1000 C 2000 D 3000

Accepted Answer

B

Question 21

21 What makes the exact copying of DNA molecules possible? A base pairing B hydrogen bonding between nucleotides C sugar-phosphate backbone D the double helix shape

Accepted Answer

A

Question 22

22 Which molecule has its synthesis directly controlled by DNA? A amylase B cholesterol C glycogen D phospholipid

Accepted Answer

A

Question 23

23 Bacteria were grown in a medium containing 15N. After several generations, all of the DNA contained 15N. Some of these bacteria were transferred to a medium containing the common isotope of nitrogen, 14N. The bacteria were allowed to divide once. The DNA of some of these bacteria was extracted and analysed. This DNA was all hybrid DNA containing equal amounts of 14N and 15N. The remaining bacteria were left in the medium with 14N and allowed to divide one more time. The DNA of some of these bacteria was extracted and analysed. What is the composition of this DNA? A 25 % hybrid DNA B 50 % hybrid DNA C 75 % hybrid DNA D 100 % hybrid DNA

Accepted Answer

B

Question 24

24 The diagram shows pressure changes in the left side of the heart and aorta over time. The length of this cardiac cycle is 0.6 s. Points 1, 2, 3 and 4 indicate when atrio-ventricular valves and semi- lunar valves either open or close. 16 3 14 2 12 10 pressure / kPa key 8 left ventricle 6 aorta 4 4 left 1 atrium 2 0 0 0.1 0.2 0.3 0.4 0.5 0.6 time / s What is the total time during one cardiac cycle that the atrio-ventricular valves and the semi-lunar valves are both closed at the same time? A 0.03 s B 0.04 s C 0.07 s D 0.21 s

Accepted Answer

C

Question 25

25 The large arteries close to the heart have a thick elastic layer in their walls. Which statements about this layer are correct? 1 evens out the blood flow from the heart 2 reduces friction within these blood vessels 3 prevents too much pressure bursting the artery wall A 1 and 2 only B 1 and 3 only C 2 and 3 only D 3 only

Accepted Answer

B

Question 26

26 The diagram shows part played by red blood cells in the transport of carbon dioxide. CO2 1 H2O 2 haemoglobin 3 4 Which row is correct? 1 2 3 4 A carbaminohaemoglobin haemoglobinic hydrogen ions hydrogen acid carbonate ions B carbonic anhydrase carbonic acid hydrogen ions hydrogen carbonate ions C carboxyhaemoglobin carbonic carbonic acid carbon dioxide anhydrase D haemoglobinic acid carbonic acid hydrogen hydrogen ions carbonate ions

Accepted Answer

B

Question 27

27 Which components of blood are also present in lymph?

white blood . sodium
proteins :
cells ions
A Jv Jv Jv
B Jv x J
Cc x Jv Jv
D x J x

key
/¥ = present
X = absent

Accepted Answer

A

Question 28

28 In which combination of environmental conditions are the stomata of a plant most likely to close? atmospheric soil water wind humidity potential speed A high low high B high low low C low high high D low low high

Accepted Answer

D

Question 29

29 The diagram shows the tissues involved in the transport of sucrose in a plant. Where is the highest concentration of sucrose? phloem sieve tube companion element cell B mesophyll cell A root cell C D

Accepted Answer

B

Question 30

30 Which evidence supports the cohesion-tension theory for the movement of water in flowering plants? 1 When the rate of transpiration of a tree is maximum, the diameter of the trunk is minimum. 2 When a plant shoot is removed close to the base of the stem, sap leaks out from the cut. 3 Evaporation of water from a porous pot can exert a force that draws water up a glass tube attached underneath the pot. 4 Droplets of water form at the edge of leaves of plants growing in conditions of soil with high water content and air with high humidity. A 1 and 2 B 1 and 3 C 2 and 3 D 2 and 4

Accepted Answer

B

Question 31

31 What describes how smoking contributes to cardiovascular disease? 1 Both nicotine and carbon monoxide speed up the development of plaques in arteries. 2 Nicotine increases blood pressure and heart rate and so increases the body’s demand for oxygen. 3 Smoking interacts with other risk factors and increases the blood cholesterol level. 4 Tar is deposited in the lining of artery walls and increases the development of atherosclerosis. A 4 only B 2 and 4 only C 1, 2 and 3 only D 1, 2, 3 and 4

Accepted Answer

C

Question 32

32 Where in the respiratory system are both goblet cells and ciliated epithelium found?

trachea bronchi bronchioles

v v x key
J/ = found

0 0O DW >

Jv x x
x Jv Jv X = not found
x x Jv

Accepted Answer

A

Question 33

33 What is an effect of inhaling tobacco smoke? A decreased mucus production B increased movement of cilia C less oxygen transport by blood D narrowing of the bronchioles

Accepted Answer

C

Question 34

34 Which does not increase the efficiency of gaseous exchange in the alveoli? A The blood capillaries and alveoli have a large total surface area. B The blood flow is slowed as it passes through the pulmonary capillaries. C The walls of the alveoli and capillaries are moist. D The walls of the alveoli and capillaries are very thin.

Accepted Answer

C

Question 35

35 Which details are correct? method of controlling disease treatment causative agent spread A AIDS use condoms during antibiotics virus sexual intercourse B cholera water treatment oral rehydration bacterium C malaria quinine vaccination protoctist D TB isolate patients antibiotics virus

Accepted Answer

B

Question 36

36 Where are antibodies and antigens found? on surface of on surface of in blood plasma pathogens phagocytes A antibodies antibodies antigens B antibodies antigens antibodies C antigens antibodies antigens D antigens antigens antibodies

Accepted Answer

D

Question 37

37 Breast milk produced by the mother for a new-born baby contains antibodies. What do these antibodies provide? A artificial active immunity B artificial passive immunity C natural active immunity D natural passive immunity

Accepted Answer

D

Question 38

38 Which group could be a population? A all the animals and plants on an isolated island B all the birds counted in one day in a garden C all the bacteria in a colony of Bacillus subtilis D all the insects occupying three hectares of farmland

Accepted Answer

C

Question 39

39 Which box contains only the parts of an ecosystem which are classed as a food web? A B C secondary consumers primary consumers decomposers D primary producers energy from inorganic sunlight minerals

Accepted Answer

B

Question 40

40 The graph shows the annual changes of the following factors in a lake. intensity of light per day numbers of producers numbers of primary consumers quantity of nutrients Which curve represents the numbers of primary consumers? A A increasing quantity B B C C D D winter summer winter time of year

Accepted Answer

D

Question paper16 pages

Mark scheme2 pages

Questions as text

Q1 · What is the diameter of a typical prokaryote, such as Streptococcus?

Q2 · Which cell components contain ribosomes?

Q3 · Where would cristae be found in a cell?

Q4 · Which cell components are present in all prokaryotic cells?

Q5 · The diagram shows a stage micrometer on which the small divisions are 0.1 mm

Q6 · In general, eukaryotic cells undergo division much slower than prokaryotic cells

Q7 · Which is the strongest type of bonding found in proteins?

Q8 · Two disaccharides are maltose and sucrose

Q9 · The diagram shows a carbohydrate molecule

Q10 · Solutions of biological molecules are tested for sugars

Q11 · Which property of water makes it most suitable for transport in eukaryotic organisms?

Q12 · Which statements about the effect of all enzyme inhibitors are correct?

Q13 · The graph shows the effect of an enzyme on a reaction

Q14 · Single-celled animals that live in fresh water have a vacuole that contracts regularly to…

Q15 · Which statement defines active transport?

Q16 · Which statements about the components of the cell surface membrane are correct?

Q17 · Which statement about a diploid cell is not correct?

Q18 · Meiosis and mitosis are two types of cell division

Q19 · A gene codes for the production of a protein, p53, that binds to damaged DNA during…

Q20 · In a genetic engineering experiment a piece of double-stranded DNA containing 6000…

Q21 · What makes the exact copying of DNA molecules possible?

Q22 · Which molecule has its synthesis directly controlled by DNA?

Q23 · Bacteria were grown in a medium containing 15N

Q24 · The diagram shows pressure changes in the left side of the heart and aorta over time

Q25 · The large arteries close to the heart have a thick elastic layer in their walls

Q26 · The diagram shows part played by red blood cells in the transport of carbon dioxide

Q27 · Which components of blood are also present in lymph?

Q28 · In which combination of environmental conditions are the stomata of a plant most likely…

Q29 · The diagram shows the tissues involved in the transport of sucrose in a plant

Q30 · Which evidence supports the cohesion-tension theory for the movement of water in…

Q31 · What describes how smoking contributes to cardiovascular disease?

Q32 · Where in the respiratory system are both goblet cells and ciliated epithelium found?

Q33 · What is an effect of inhaling tobacco smoke?

Q34 · Which does not increase the efficiency of gaseous exchange in the alveoli?

Q35 · Which details are correct?

Q36 · Where are antibodies and antigens found?

Q37 · Breast milk produced by the mother for a new-born baby contains antibodies

Q38 · Which group could be a population?

Q39 · Which box contains only the parts of an ecosystem which are classed as a food web?

Q40 · The graph shows the annual changes of the following factors in a lake

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