CAPE Biology Unit 2 · 2003 · Paper 1

53 questions and parts from this paper. Open one to see it in full, then practise it on Quelpr and get it marked against the mark scheme.

1. 1(a)3 marksPredict, with reasons, which photosynthetic product of Plant A will contain radioactivity.
2. 1(b)3 marksPredict, with reasons, which photosynthetic product of Plant B will contain radioactivity.
3. 1(c)(i)2 marksFrom the graph in Figure 1, describe how the amount of ATP generated by the plant varies with increasing light intensity.
4. 1(c)(ii)2 marksState ONE reason why ATP production does not increase indefinitely.
5. 2(a)(i)1 markState which molecule accepts the 2H from NADH2 during anaerobic respiration in animals.
6. 2(a)(ii)1 markState the product of anaerobic respiration in animals.
7. 2(a)(iii)2 marksState TWO products produced under similar anaerobic conditions in plants.
8. 2(b)2 marksIn animals, explain what happens to the product formed during anaerobic respiration when oxygen becomes available again.
9. 2(c)2 marksSuggest TWO reasons for this decline in yeast population.
10. 2(d)2 marksState TWO advantages of using natural enzymes rather than an inorganic catalyst to catalyse the breakdown of carbohydrate solutions.
11. 3(a)1 markState briefly what happens to a stable ecosystem when it is disturbed.
12. 3(b)(i)2 marksSuggest the effects that removing Species A will have on the coral reef ecosystem.
13. 3(b)(ii)3 marksSuggest the effects that removing Species B will have on the coral reef ecosystem.
14. 3(c)(i)1 markExplain why the nitrogen available to the rain forest is NOT zero units at the time of infection.
15. 3(c)(ii)2 marksSuggest an explanation for the shape of the graph in Figure 3.
16. 3(c)(iii)1 markOn the graph in Figure 3 on page 7, draw a single line to illustrate the nitrogen that would be available to a rain forest tree that is NOT infected with mycorrhizae.
17. 4(a)1 markDeduce the type of blood vessel shown in Figure 4 and give ONE reason for your answer.
18. 4(b)1 markUsing your knowledge of the diameter of a red blood cell, determine the length of the section of the vessel labelled A.
19. 4(c)(i)1 markAfter exercising vigorously, a person's face may become flushed red. State what causes the face to appear red.
20. 4(c)(ii)1 markIf you were cut while exercising, state ONE way by which you could determine whether you had cut an artery or a vein.
21. 4(d)3 marksClearly indicate on Figure 5 the positions of: (i) Sinoatrial node, (ii) Atrioventricular node, and (iii) Purkyne tissue.
22. 4(e)2 marksIn a condition known as fibrillation, the heart pace-maker fails. Deduce what would occur as a result of this situation.
23. 4(f)1 markAtherosclerosis is a thickening of the artery walls as a result of deposition of fat and cholesterol in the lining. Deduce the effect this would have on blood pressure.
24. 5(a)2 marksIdentify the structures labelled 1 to 4 in Figure 6.
25. 5(b)(i)2 marksWhat is the role of calcium ions at location 2?
26. 5(b)(ii)2 marksWhat is the role of protein structures found on the surface of location 4?
27. 5(c)(i)1 markSuggest the effects of preventing neurotransmitter degradation on the postsynaptic neuron.
28. 5(c)(ii)1 markSuggest the effects of preventing neurotransmitter degradation on the ability of the presynaptic neuron to rebuild synaptic vesicles.
29. 5(d)2 marksGive TWO reasons why the method of transmission at K increases the ability of the synapse to exert controls.
30. 6(a)(i)3 marksComment on the volumes of gases produced, their sequence, and interrelationships.
31. 6(a)(ii)1 markWhat is the MAIN chemical process that causes the effect at days 9 to 10?
32. 6(a)(iii)1 markState ONE other chemical process occurring in the bananas that is associated with this peak.
33. 6(b)(i)1 markSuggest how this knowledge could be used to produce a market-ready fruit.
34. 6(b)(ii)1 markState when the use of that knowledge could be applied.
35. 6(c)(i)2 marksTo delay fruit ripening, shippers may reduce oxygen levels to 5% and increase nitrogen levels correspondingly. What other process, which also produces CO2, must be guarded against, and why?
36. 6(c)(ii)1 markGenetically altered forms of ethylene biosynthetic inhibitor enzymes have been transferred into tomato plants. Suggest ONE way in which the development of the tomato fruits would be affected.
37. 7(a)2 marksName the type of therapy mentioned in the passage and explain what effect it would have on the newborn baby.
38. 7(b)1 markA mother whose first child died of SCID asks during her second pregnancy to check the foetus. Name ONE method which the doctor could use to determine if the foetus was affected.
39. 7(c)1 markIn SCID disorder, stem cells are isolated, genetically modified, and re-injected. Give ONE other method by which genetically modified genes can be introduced into the body.
40. 7(d)(i)4 marksOutline THREE ways in which the government can determine if the genetically modified maize has contaminated the indigenous maize.
41. 7(d)(ii)1 markIf the indigenous maize has been contaminated by the genetically modified maize, deduce how the genotype could have been affected.
42. 7(d)(iii)1 markHow can the original genotype of the indigenous maize be restored?
43. 8(a)(i)3 marksComment on the relationship between smoking and lung cancer for men.
44. 8(a)(ii)3 marksState THREE ways in which smoking trends and deaths are different in women than from those shown in men.
45. 8(b)1 markName ONE carcinogen found in the tar extracted from smouldering cigarettes.
46. 8(c)2 marksBriefly describe an animal experiment which has been performed, to directly establish a link between the inhalation of cigarette smoke and the confirmed development of lung cancer.
47. 8(d)1 markState TWO other diseases caused by smoking.
48. 9(a)4 marksComplete Table 2 by adding information about the effects of alcohol on behaviour for the given blood alcohol concentration ranges.
49. 9(b)1 markRecommendations for safe consumption of alcohol changed from 'units per week' to 'units per day'. Suggest ONE advantage of the new time period.
50. 9(c)(i)1 markSince alcohol is taken into the body through the digestive system, explain why breath is analysed.
51. 9(c)(ii)1 markState why 35 µg and not 80 mg is the critical point in the breathalyzer test.
52. 9(d)1 markState ONE other body fluid that could be used to assess the alcohol content of the body.
53. 9(e)2 marksDistinguish between physical and psychological drug dependence.