CAPE Biology Unit 2 · 2008 (T&T) · Paper 2

28 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)2 marksLabel the structures highlighted as I and II on Figure 1.
2. 1(a)(ii)2 marksState the main function of each of the structures labelled I and II in cellular respiration.
3. 1(a)(iii)2 marksCalculate the length of the mitochondrion shown in Figure 1, showing all steps.
4. 1(b)3 marksState two structural similarities and one structural difference between chloroplasts and mitochondria.
5. 1(c)6 marksUsing an annotated diagram only, explain how energy is generated in the respiratory chain reaction in mitochondria.
6. 2(a)(i)6 marksWith reference to the activities occurring at stages I to IV, discuss the six key features of the mass pressure-flow hypothesis.
7. 2(a)(ii)2 marksDescribe one major difference between xylem and phloem transport processes in plants.
8. 2(b)(i)4 marksIllustrate and label the main chambers of the mammalian heart in longitudinal section.
9. 2(b)(ii)1 markUse arrows on your drawing to illustrate the circuit of blood flow through the chambers of the heart.
10. 2(b)(iii)2 marksIdentify which chamber of the heart plays the most important role in pumping, and describe its main structural feature contributing to this function.
11. 3(a)(i)2 marksDefine the term 'health'.
12. 3(a)(ii)4 marksUsing two examples, explain why it is difficult to place most diseases into a single category.
13. 3(b)(i)2 marksCalculate her Body Mass Index (BMI), showing all calculations.
14. 3(b)(ii)1 markComment on this BMI value compared to the acceptable range.
15. 3(b)(iii)2 marksPredict two medical conditions that this individual may develop based on her BMI and cholesterol levels.
16. 3(c)(i)3 marksDraw a graph to illustrate the mortality rate data from 1990 to 2001.
17. 3(c)(ii)1 markSuggest one reason for the change in mortality rate observed after 1994.
18. 4(a)(i)4 marksDiscuss the concept of 'biodiversity' in terms of genetic, species and ecosystem diversity.
19. 4(a)(ii)4 marksOutline two reasons why it is important to conserve biodiversity.
20. 4(b)(i)3 marksDefine the term 'ecosystem'.
21. 4(b)(ii)4 marksDiscuss why ecosystems are considered dynamic in nature.
22. 5(a)6 marksDescribe the basic structure of a myelinated motor neurone.
23. 5(b)6 marksExplain the electrical basis of a nerve impulse in relation to the structure of a neurone.
24. 5(c)3 marksCiting three main phases of activity, discuss how a neurone transmits an impulse upon receiving a stimulus.
25. 6(a)6 marksCompare HIV infection and dengue in terms of mode of transmission, onset of symptoms, and prevention of transmission.
26. 6(b)(i)4 marksExplain how HIV integrates and becomes a permanent part of the host cell in infected individuals.
27. 6(b)(ii)1 markSuggest one reason why integration into the host genome does not occur with the dengue virus.
28. 6(c)4 marksAssess the validity of the statement that cancer is associated with changes in cell DNA, referring to two common causes of cancer.