CAPE Biology Unit 2 · 2018 · Paper 2

22 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)3 marksWriting your answer in Figure 1, insert the number of carbon atoms contained in EACH of the compounds labelled B to G (example provided for Compound A).
2. 1(a)(ii)1 markWriting your answer in Figure 1, insert the input and product at the point numbered 4, as completed for points 1, 2, 3 and 5.
3. 1(a)(iii)4 marksExplain the TWO MAIN roles of the Krebs cycle.
4. 1(b)(i)4 marksOn the grid provided on page 7, plot a line graph based on the data provided in Table 1.
5. 1(b)(ii)3 marksUsing the concept of limiting factors, suggest THREE reasons for the shape of the graph drawn in b (i).
6. 2(a)(i)3 marksIn the space provided, draw and label a diagram of the TWO phloem cell types shown in Figure 2B.
7. 2(a)(ii)2 marksDescribe TWO features of EACH phloem cell type shown in Figure 2B.
8. 2(a)(iii)2 marksState the major function of EACH of the TWO phloem cell types.
9. 2(b)(i)4 marksExplain what is meant by EACH of the following terms: - Blood pressure - Pulse
10. 2(b)(ii)2 marksDescribe the effect of EACH of the following parameters on blood pressure and pulse rate: - Sleep - Fluoxetine
11. 2(b)(iii)2 marksShould John continue to take fluoxetine? Give a reason for your answer.
12. 3(a)(i)4 marksIn the box provided, draw a flowchart to illustrate the stages in the detoxification of alcohol in the liver, including the enzymes and coenzyme involved.
13. 3(a)(ii)3 marksExplain how the metabolism of alcohol can lead to a short-term effect on the liver.
14. 3(a)(iii)2 marksDescribe how alcohol-induced cirrhosis occurs and its effects on the liver.
15. 3(b)(i)3 marksComplete Table 2 by writing the numbers 2, 3, 4, 5 and 6 to indicate the order of the steps in the replication of HIV in host cells. Steps 1 and 7 have been done for you.
16. 3(b)(ii)3 marksDescribe THREE ways by which HIV can be transmitted.
17. 4(a)6 marks“For a top carnivore to be numerous in an ecosystem, it must feed at many different levels of the food chain and not just the one beneath it.” Discuss the veracity of this statement.
18. 4(b)9 marksWithin any ecosystem, biodiversity exists at three levels: genetic, species and ecosystem. Discuss the interaction among these three levels of biodiversity. Include in your answer an explanation of EACH level — genetic,…
19. 5(a)8 marksAn athlete loses a considerable amount of water by sweating during training, after which he has a high intake of fluids. Explain the mechanism by which water balance is maintained in this athlete’s body.
20. 5(b)7 marksThe potential difference across the membrane of a resting neurone is approximately −70 mV. Explain the role of the membrane in maintaining this resting potential.
21. 6(a)7 marksChronic diseases, which are increasing in both incidence and prevalence, are precipitated by lifestyle choices, and are having a marked effect on mortality in the Caribbean. Explain this phenomenon, referring to a…
22. 6(b)8 marksJoseph contracts dengue fever and recovers. Three months later, he goes to another town to take care of his grandmother who is suffering from dengue fever. He decides to take her to the hospital where both his blood and…