Cambridge A Level Biology 9700 — 2007 Oct/Nov Paper 1 · Variant 1

Question 1

1 The diagram shows part of a membrane around a vacuole of a plant cell. scale bar 2 nm What is the width of the membrane? A 7.5 × 10–3 m B 7.5 × 10–6 m C 7.5 × 10–9 m D 7.5 × 10–12 m

Accepted Answer

C

Question 2

2 The diagram is taken from an electron micrograph of a cell which secretes digestive enzymes. Where are these enzymes made? A B C D

Accepted Answer

C

Question 3

3 A specimen is viewed under a microscope using green light with a wavelength of 510 nm. If the same specimen is viewed under the same conditions, but using red light with a wavelength of 650 nm instead, what effect will this have on the magnification and on the resolution of the microscope? magnification resolution A decreased decreased B increased increased C remains the same increased D remains the same decreased

Accepted Answer

D

Question 4

4 The diagram shows a transverse section of part of a dicotyledonous leaf. 1 4 2 3 What are the correct labels for 1, 2, 3 and 4? 1 2 3 4 A phloem xylem palisade mesophyll spongy mesophyll B phloem xylem spongy mesophyll palisade mesophyll C xylem phloem palisade mesophyll  spongy mesophyll D xylem phloem spongy mesophyll palisade mesophyll

Accepted Answer

D

Question 5

5 A student is asked to study two photographs, taken at the same magnification, of a palisade mesophyll cell, one using a high quality light microscope and the other using an electron microscope. The student observed 1 the cisternae of the Golgi apparatus 2 the grana in the chloroplasts 3 the two membranes of the nuclear envelope 4 the vacuole enclosed by a tonoplast Which features can be seen because of the higher resolution of the electron microscope? A 1, 2 and 3 B 1, 2 and 4 C 1, 3 and 4 D 2, 3 and 4

Accepted Answer

A

Question 6

6 The diagram shows a photomicrograph. Its magnification is ×2800. What is the diameter of the nucleolus? A 2.5 µm B 5 µm C 10 µm D 20 µm

Accepted Answer

A

Question 7

7 When solutions of dilute sodium hydroxide and copper(II) sulphate (biuret test) were added to an unknown substance, a purple colour was observed. This test indicates the presence of which bond in the unknown substance? A disulphide B hydrogen C ionic D peptide

Accepted Answer

D

Question 8

8 The diagram shows part of a macromolecule in the form of triple helices, lying side by side with covalent cross links between them. What is the name of the molecule? A cellulose B collagen C glycogen D triglyceride

Accepted Answer

B

Question 9

9 Which of the following is a polysaccharide present in human muscle? A amylose B collagen C glycogen D haemoglobin

Accepted Answer

C

Question 10

10 An investigation was carried out into the effect of various chemicals on the permeability of the
plasma membrane and tonoplast of beetroot cells. Beetroot cell vacuoles contain a red pigment,
which cannot pass out of the cells because it cannot diffuse through their tonoplasts and plasma
membranes.

1 cm® cubes were cut from beetroot and washed in running water for twenty minutes to remove
any pigment released from damaged cells.

They were then placed in different solutions and the results observed. In each case the solution
turned red.

What shows the correct behaviour of phospholipids and proteins in different solutions?

solution phosprolpids solution een
A dilute HCl Jv water at 40°C Jv
B dilute HCl Jv ethanol Jv
Cc ethanol Jv dilute HC Jv
D water at 40°C Jv ethanol Jv

Accepted Answer

C

Question 11

11 The diagram shows a phospholipid molecule. X H H O H C C C H O O H C O C O Z Y What are X, Y and Z? X Y Z A hydrocarbon chain hydrocarbon chain phosphate-containing group B hydrocarbon chain glycerol phosphate-containing group C phosphate-containing group hydrocarbon chain hydrocarbon chain D phosphate-containing group glycerol hydrocarbon chain

Accepted Answer

C

Question 12

12 The diagrams show four different molecules. P Q CH2OH CH2OH C O H O H H N C C H C C H OH OH H H HO OH C C H OH R S CH2OH O OH C O C H OH H CH2 C C OH H H HO H O C C N C C H OH H OH H Which shows the correct information about the molecule or molecules? contains a forms 1,6 glycosidic forms peptide bonds carboxyl group bonds in glycogen by condensation A P P P and Q B Q R P and R C R R R and Q D S P Q and S

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 activation energy B catalysed reaction uncatalysed reaction energy lost during reaction C uncatalysed reaction catalysed reaction energy gained by product D uncatalysed reaction catalysed reaction overall energy change

Accepted Answer

D

Question 14

14 Which graph represents the action of a non-competitive inhibitor? A B maximum maximum rate of rate of reaction reaction concentration of substrate concentration of substrate key without inhibitor C D with inhibitor maximum maximum rate of rate of reaction reaction concentration of substrate concentration of substrate

Accepted Answer

A

Question 15

15 Strips of plant tissue were immersed in a range of sucrose solutions of different concentrations. Their lengths were measured before immersion and after 30 minutes. The graph shows the ratio of initial length to final length. 1.4 1.2 1.0 initial length final length 0.8 0.6 0.4 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 sucrose concentration / mol dm–3 What is a correct description of the change in the cells and in their water potential as the sucrose concentration increases? change in the cells change in the water potential A more turgid less negative B less turgid more negative C more turgid more negative D less turgid less negative

Accepted Answer

B

Question 16

16 The graph shows rates of simple diffusion and facilitated diffusion, of substance X across a cell surface membrane, as the concentration of substance X increases. simple diffusion rate of facilitated diffusion diffusion / arbitrary units concentration of substance X Why does the rate of facilitated diffusion level off whereas the rate of simple diffusion does not? A Facilitated diffusion is limited by the number of protein channels in the membrane. B Facilitated diffusion is limited by the number of protein pumps in the membrane. C Facilitated diffusion requires ATP which will eventually be used up. D Only facilitated diffusion is affected by the kinetic energy of the molecules that are diffusing.

Accepted Answer

A

Question 17

17 Which part of a phospholipid molecule makes up most of the thickness of a cell surface membrane? A glycerol B hydrocarbon chains C hydrophilic head D phosphate group

Accepted Answer

B

Question 18

18 Which of the following is true of cancer? A Each mitotic division produces more than two daughter cells. B Mitosis has stopped. C Mitosis is uncontrolled. D Mitosis results in cells with variable numbers of chromosomes.

Accepted Answer

C

Question 19

19 Each of the following events takes place during mitosis. 1 centromeres divide 2 chromatids move to opposite poles of the cell 3 chromosomes line up along the equator of the spindle 4 chromosomes uncoil 5 two chromatids are joined by a centromere In which order do the events take place? first last A 1 2 4 5 3 B 3 1 2 4 5 C 4 5 3 1 2 D 5 3 1 2 4

Accepted Answer

D

Question 20

20 The diagram shows part of a DNA molecule. Where are hydrogen bonds found? A B C D

Accepted Answer

D

Question 21

21 Which type of molecule is the end product of translation? A amino acid B DNA C mRNA D polypeptide

Accepted Answer

D

Question 22

22 An unidentified single-stranded molecule was described as having the following features. • complementary base pairing along some of its length • an area that can attach to a ribosome • a site to which a specific amino acid attaches What is the unidentified molecule? A DNA polymerase B messenger RNA C RNA polymerase D transfer RNA

Accepted Answer

D

Question 23

23 Some antibacterial drugs can affect the synthesis of proteins. antimicrobial rifampicin streptomycin tetracycline drug mode of binds to RNA genetic code misread prevents binding of action polymerase during translation tRNA to ribosome Which is the correct set of immediate effects of these drugs? antimicrobial rifampicin streptomycin tetracycline drug A defective protein mRNA does not bind to amino acids not added synthesised ribosome to growing chain B mRNA not synthesised defective protein amino acids not added synthesised to growing chain C mRNA not synthesised mRNA does not bind to transcription prevented ribosome D transcription prevented defective protein mRNA does not bind to synthesised ribosome

Accepted Answer

B

Question 24

24 The diagram represents the phloem pathway, with adjacent cells, from leaf to root in a plant. 2 leaf cell 1 chloroplast parenchyma cell nucleus companion cell root cell Which process is occurring between 1 to 2 and what is the effect on the water potential at 2? process from 1 to 2 water potential at 2 A active transport of sucrose becomes more negative B active transport of sucrose becomes less negative C diffusion of sucrose becomes more negative D diffusion of sucrose becomes less negative

Accepted Answer

A

Question 25

25 The diagram represents a transverse section through a part of the root of a plant. cortex xylem soil water Which values of water potential (kPa) in the xylem and soil water help to explain why water passes from the soil into the xylem across the cortex? xylem soil water A –700 kPa 0 kPa B –1800 kPa –700 kPa C 0 kPa –1800 kPa D –700 kPa –1800 kPa

Accepted Answer

B

Question 26

26 Translocation in plants moves sucrose from sources to sinks. Which of the following can be a source and which a sink? source sink A germinating seeds green leaves B green leaves storage roots C phloem germinating seeds D storage roots phloem

Accepted Answer

B

Question 27

27 The red blood cell count of humans increases when they remain at high altitudes. What is the effect of this? A It increases the Bohr effect. B It increases the rate of oxygen transport. C It reduces the amount of haemoglobin per cell. D It reduces the heart rate.

Accepted Answer

B

Question 28

28 A molecule of haemoglobin contains four haem groups. The haem groups contain iron atoms which can bond reversibly with oxygen. How many oxygen atoms can be carried by one haemoglobin molecule? A 4 B 8 C 12 D 16

Accepted Answer

B

Question 29

29 What is systolic blood pressure? A the blood pressure in the arteries when the heart is relaxing B the blood pressure in the left ventricle at the end of a contraction C the maximum blood pressure in the arteries D the maximum blood pressure in the right ventricle

Accepted Answer

C

Question 30

30 Which cells or tissues are incorrectly paired with their function? cells / tissues function A cartilage reinforces the trachea B ciliated epithelial cells move mucus over the surface of the trachea C goblet cells produce enzymes to destroy bacteria D smooth muscle constriction of the bronchioles

Accepted Answer

C

Question 31

31 The graph shows the volume of air breathed out quickly and with force, following a deep breath in, for three different people, X, Y and Z. 5 X 4 Y 3 volume / dm3 2 Z 1 0 0 1 2 3 4 5 time / s What is an explanation for the differences shown? chronic bronchitis emphysema healthy lung function A X Y Z B X Z Y C Y Z X D Z Y X

Accepted Answer

C

Question 32

32 Which statement is an example of epidemiological evidence linking smoking to lung cancer? A Chemical analysis of tar from cigarettes shows that it contains carcinogens. B Dogs made to inhale the smoke from cigarettes develop lung tumours. C The incidence of lung cancer increases in a population as more cigarettes are smoked. D When tar from cigarettes is rubbed onto the skin of mice, the mice develop skin tumours.

Accepted Answer

C

Question 33

33 Some facts about diseases are listed. 1 may be inherited from a parent 2 may be carried by a vector 3 may be caused by stress 4 may be passed on by contact 5 may enter through the mouth with food Which numbered statements apply to infectious diseases? A 1, 2 and 3 B 1, 3 and 5 C 2, 3 and 4 D 2, 4 and 5

Accepted Answer

D

Question 34

34 Which disease is not likely to be passed directly from parent to child? A cholera B HIV / AIDS C malaria D tuberculosis

Accepted Answer

C

Question 35

35 Which diseases can be cured by the use of antibiotics? A cholera and tuberculosis B HIV / AIDS and smallpox C HIV / AIDS and tuberculosis D smallpox and cholera

Accepted Answer

A

Question 36

36 Which sequence of events correctly describes the action of a phagocyte when a pathogen is encountered? A endocytosis → digestion by lysosome enzymes → phagocytic vacuole formation → exocytosis B endocytosis → phagocytic vacuole formation → digestion by lysosome enzymes → exocytosis C exocytosis → phagocytic vacuole formation → digestion by lysosome enzymes → phagocytosis D phagocytosis → digestion by lysosome enzymes → phagocytic vacuole formation → endocytosis

Accepted Answer

B

Question 37

37 Where are antibodies and antigens found? on surface of on surface of in blood plasma pathogen macrophage A antibody antibody antigen B antibody antigen antibody C antigen antibody antigen D antigen antigen antibody

Accepted Answer

D

Question 38

38 Which statement explains why two species cannot permanently occupy the same ecological niche? A The two species could not interbreed. B The two species may be part of separate food webs. C The two species would compete for the same resources. D The two species would have different nutritional requirements.

Accepted Answer

C

Question 39

39 Following an environmental disaster of a major volcanic eruption, the atmosphere contains greatly increased amounts of dust. How does this affect the following organisms? nitrifying bacteria primary consumer producer secondary consumer A decrease increase increase increase B increase decrease decrease decrease C increase no change no change decrease D no change increase decrease no change

Accepted Answer

B

Question 40

40 The diagram shows the flow of energy through an ecosystem. Photosynthesis is the gross productivity. Producers lose some energy in respiration and the energy left is the net productivity. This can also be expressed as an equation: Net Productivity (NP) = Gross Productivity (GP) – Respiration (R) Some of the net productivity passes to herbivores. energy from sunlight photosynthesis 96 % producers gross productivity 4 % 2.25 % lost in respiration net productivity 1.75 % 1 % to decomposers 0.75 % primary consumers 0.275 % to 0.4 % lost in respiration decomposers 0.075 % secondary consumers 0.0685 % to 0.06 % lost in respiration decomposers Which calculation gives the proportion of net productivity passing to herbivores? 0.075 0.75 0.75 ( 0.75 +0.075 ) A B C D 1.75 4 1.75 1.75

Accepted Answer

C

Question paper20 pages

Mark scheme2 pages

Questions as text

Q1 · The diagram shows part of a membrane around a vacuole of a plant cell

Q2 · The diagram is taken from an electron micrograph of a cell which secretes digestive…

Q3 · A specimen is viewed under a microscope using green light with a wavelength of 510 nm

Q4 · The diagram shows a transverse section of part of a dicotyledonous leaf

Q5 · A student is asked to study two photographs, taken at the same magnification, of a…

Q6 · The diagram shows a photomicrograph

Q7 · When solutions of dilute sodium hydroxide and copper(II) sulphate (biuret test) were…

Q8 · The diagram shows part of a macromolecule in the form of triple helices, lying side by…

Q9 · Which of the following is a polysaccharide present in human muscle?

Q10 · An investigation was carried out into the effect of various chemicals on the permeability…

Q11 · The diagram shows a phospholipid molecule

Q12 · The diagrams show four different molecules

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

Q14 · Which graph represents the action of a non-competitive inhibitor?

Q15 · Strips of plant tissue were immersed in a range of sucrose solutions of different…

Q16 · The graph shows rates of simple diffusion and facilitated diffusion, of substance X…

Q17 · Which part of a phospholipid molecule makes up most of the thickness of a cell surface…

Q18 · Which of the following is true of cancer?

Q19 · Each of the following events takes place during mitosis

Q20 · The diagram shows part of a DNA molecule

Q21 · Which type of molecule is the end product of translation?

Q22 · An unidentified single-stranded molecule was described as having the following features

Q23 · Some antibacterial drugs can affect the synthesis of proteins

Q24 · The diagram represents the phloem pathway, with adjacent cells, from leaf to root in a…

Q25 · The diagram represents a transverse section through a part of the root of a plant

Q26 · Translocation in plants moves sucrose from sources to sinks

Q27 · The red blood cell count of humans increases when they remain at high altitudes

Q28 · A molecule of haemoglobin contains four haem groups

Q29 · What is systolic blood pressure?

Q30 · Which cells or tissues are incorrectly paired with their function?

Q31 · The graph shows the volume of air breathed out quickly and with force, following a deep…

Q32 · Which statement is an example of epidemiological evidence linking smoking to lung cancer?

Q33 · Some facts about diseases are listed

Q34 · Which disease is not likely to be passed directly from parent to child?

Q35 · Which diseases can be cured by the use of antibiotics?

Q36 · Which sequence of events correctly describes the action of a phagocyte when a pathogen is…

Q37 · Where are antibodies and antigens found?

Q38 · Which statement explains why two species cannot permanently occupy the same ecological…

Q39 · Following an environmental disaster of a major volcanic eruption, the atmosphere contains…

Q40 · The diagram shows the flow of energy through an ecosystem

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