CSEC Biology · January 2017 · Paper 2

36 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)(i)4 marksPlot the data in Table 1 on the grid below.
2. 1(a)(ii)1 markUse the graph plotted in (a)(i) to identify the optimum temperature for Enzyme X.
3. 1(a)(iii)2 marksAccount for the shape of the graph: Between 5 °C and 30 °C
4. 1(a)(iii)2 marksAccount for the shape of the graph: Above 40 °C
5. 1(a)(iv)1 markState ONE precaution that the students should take when carrying out this experiment.
6. 1(b)(i)2 marksName TWO enzymes that break down protein.
7. 1(b)(ii)2 marksName TWO parts of the human alimentary canal where enzymes that break down protein are found.
8. 1(b)(iii)2 marksSuggest TWO reasons why the different enzymes for breaking down proteins are located in two different parts of the alimentary canal.
9. 1(c)(i)1 markIdentify the type of relationship that exists between the peanut plant and the bacteria.
10. 1(c)(ii)3 marksExplain your answer in (c)(i) on page 6.
11. 1(c)(iii)3 marksDescribe a suitable procedure for testing the presence of protein in peanuts.
12. 1(c)(iv)2 marksSuggest TWO reasons why plants need protein.
13. 2(a)(i)3 marksState THREE differences between a plant cell and an animal cell.
14. 2(a)(ii)2 marksState TWO differences between a prokaryotic cell and a eukaryotic cell.
15. 2(b)(i)1 markState the function of EACH of the following: Cell wall
16. 2(b)(ii)1 markState the function of EACH of the following: Cell membrane
17. 2(c)(i)2 marksExplain what happens to an animal cell when it is removed from the organism and placed into concentrated sucrose solution.
18. 2(c)(ii)2 marksExplain what happens to an animal cell when it is removed from the organism and placed into distilled water.
19. 2(c)(iii)2 marksDescribe how the results would be different from (c)(i) and (ii) for a plant cell in concentrated sucrose solution and distilled water respectively. Concentrated sucrose solution
20. 2(c)(iii)2 marksDescribe how the results would be different from (c)(i) and (ii) for a plant cell in concentrated sucrose solution and distilled water respectively. Distilled water
21. 3(a)(i)3 marksIdentify the components of blood that are labelled A, B and C in Figure 1. A B C
22. 3(a)(ii)1 markName the component of the blood that is responsible for clotting.
23. 3(b)3 marksComplete the flow diagram shown in Figure 2 by filling in the missing words at positions D, E and F.
24. 3(c)(i)3 marksComplete the following genetics diagram to illustrate this information. Parents' phenotypes: Male x Female Parents' genotypes: x XHXh Gametes: x (XH)(Xh) Fertilization cross: Gametes XH Xh
25. 3(c)(ii)1 markState the probability of the couple having a haemophiliac child.
26. 3(c)(iii)3 marksWhat is the likely sex of the haemophiliac child? Give ONE reason to support your answer.
27. 3(d)1 markSuggest ONE reason why haemophiliacs may be more susceptible to infectious disease.
28. 4(a)9 marksDescribe how oxygen in the atmosphere becomes available to human blood for delivery to the cells, and explain how this process differs from the way plant cells obtain oxygen for respiration.
29. 4(b)6 marksSuggest SIX reasons why humans who smoke heavily have less oxygen available to the cells for respiration.
30. 5(a)(i)4 marksDescribe the pathway that blood takes as it flows into the heart from the lungs, until it is pumped out of the heart to be sent to the rest of the body.
31. 5(a)(ii)2 marksIdentify TWO physiological diseases that affect the circulatory system.
32. 5(b)4 marksChemotherapy destroys both malignant and good cells. Explain why a person undergoing chemotherapy would have decreased natural immunity.
33. 5(c)5 marksSuggest why he is given an antiserum injection instead of a vaccine.
34. 6(a)6 marksDescribe how genetic engineering is used to produce human insulin using the bacterium E. coli.
35. 6(b)(i)6 marksDiscuss THREE differences between genetic engineering and artificial selection used by farmers to produce improved varieties of crop plants.
36. 6(b)(ii)3 marksSuggest THREE advantages of using genetic engineering to produce insulin.