CAPE Biology Unit 1 · 2011 · Paper 2

34 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 marksIdentify the structures labelled A, B and C in Figure 1.
2. 1(a)(ii)1 markThe structure labelled A in Figure 1 is also present in some eukaryotic cells. State how the structure of A in prokaryotic cells differs when present in eukaryotic cells.
3. 1(a)(iii)1 markThere are two types of eukaryotic cells, plant and animal. In which of these is the structure labelled A in Figure 1, NOT found?
4. 1(a)(iv)1 markName the structure in a eukaryotic cell that serves the same function as the mesosomes of a prokaryotic cell.
5. 1(a)(v)1 markBoth eukaryotic cells and prokaryotic cells contain DNA. State ONE way in which the DNA in eukaryotic cells differs from the DNA in prokaryotic cells.
6. 1(b)3 marksComplete the table by writing the correct answers in the spaces provided.
7. 1(c)(i)4 marksOutline a simple investigation to determine which solution has the same water potential as the potato.
8. 1(c)(ii)1 markDescribe the expected observation in the solution with the same water potential as the potato.
9. 2(a)(i)1 markState the term which describes the interaction of these two genes.
10. 2(a)(ii)2 marksDefine the terms 'allele' and 'dominant'.
11. 2(a)(iii)5 marksIn the space provided, draw a genetic diagram to explain the cross.
12. 2(b)(i)1 markBased on the type of cross, deduce the expected ratio of the phenotypes.
13. 2(b)(ii)1 markformulate a possible null hypothesis for the Chi-square test.
14. 2(b)(iii)2 marksState the formula for, and determine the number of degrees of freedom in the Chi-square test performed in (b)(ii), briefly explaining any terms used.
15. 2(b)(iv)1 markUse the calculated value of χ² (10.81) and the probabilities provided in Table 2 to find the probability of the results of the cross departing significantly by chance from the expected ratio. State your findings.
16. 2(b)(v)2 marksWhat conclusion may be drawn from the probability found in (b)(iv)?
17. 3(a)(i)3 marksIdentify the structures labelled A, B and C in Figure 2.
18. 3(a)(ii)2 marksState the function of EACH of the structures labelled X and Y.
19. 3(b)(i)3 marksCalculate the actual length of the spermatozoon. Show the steps in your calculation.
20. 3(b)(ii)2 marksWith reference to Figure 3, describe TWO ways in which a mature spermatozoon differs from an ovum.
21. 3(c)(i)4 marksIn the box below, draw and label a plan diagram of the section shown in Figure 4 as identified by the two lines in the lower part of the figure. Make your drawing two times the actual size of the section highlighted.
22. 3(c)(ii)1 markName the next stage in the development of the highlighted section in Figure 4.
23. 4(a)(i)6 marksWith reference to the levels of structural organization and types of bonds, describe the structure of the protein, collagen. (No diagrams are required.)
24. 4(a)(ii)2 marksExplain ONE functional property of collagen which makes it suitable as a major component of tendons and ligaments.
25. 4(b)(i)2 marksOutline FOUR key stages in the mode of action of enzymes in catalysing chemical reactions.
26. 4(b)(ii)5 marksEnzyme activity may be altered by poisons and drugs. Discuss, using a specific example, how poisons such as insecticides may affect enzyme activity.
27. 5(a)(i)6 marksOutline the stages in Meiosis 1 and comment on the importance of this phase of meiosis.
28. 5(a)(ii)2 marksState TWO ways in which daughter cells produced by meiosis differ from those resulting from mitosis.
29. 5(b)(i)3 marksWhich of the three types of natural selection BEST describes the example above? Justify your choice.
30. 5(b)(ii)4 marksDiscuss how the frequency of the distribution of phenotypes in the example above would be different if the other two types of selection operated.
31. 6(a)(i)2 marksDefine the term 'vegetative propagation'.
32. 6(a)(ii)7 marksDiscuss FOUR advantages and THREE disadvantages of using tissue culture as a method of vegetative propagation.
33. 6(b)(i)2 marksDistinguish between the terms 'pollination' and 'fertilization'.
34. 6(b)(ii)4 marksDescribe TWO reproductive strategies used by plants to promote cross-fertilization.