CAPE Biology Unit 1 · 2009 · Paper 2

30 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 marksOn the figure, identify the structures labelled A, B, C and D.
2. 1(a)(ii)1 markWith reference to the structures labelled in Figure 1, which structure is present only in animal cells and NOT in plant cells?
3. 1(a)(iii)1 markIn addition to the structures labelled in Figure 1, there are other structures that work together to make lipids available to the cell. Name TWO of these structures.
4. 1(a)(iv)3 marksExplain how the two structures named in (a)(iii) work together and make lipids available to the cell.
5. 1(b)(i)4 marksComplete the graph below to show the results given in Table 1.
6. 1(b)(ii)2 marksSuggest an explanation for the shape of the curve.
7. 1(b)(iii)2 marksList TWO other variables that should be kept constant during this experiment.
8. 2(a)(i)3 marksState the term used to describe the interaction of the two genes described above, and give an explanation of the nature of the interaction.
9. 2(a)(ii)5 marksCrosses between black mice, all heterozygous for both genes, produced offspring with black, brown and white coat colour. Determine the ratio of the phenotypes and for EACH phenotype suggest ONE genotype.
10. 2(b)(i)3 marksIdentify the stages labelled as X, Y and Z.
11. 2(b)(ii)2 marksState TWO features of the stage in Meiosis I which comes after Stage Z.
12. 2(b)(iii)2 marksExplain how the events shown in Stage X of Meiosis I contribute to heritable variation.
13. 3(a)(i)2 marksDefine the terms 'asexual reproduction' and 'vegetative propagation'.
14. 3(a)(ii)1 markStructures such as bulbs, corms and tubers are suitable for use in vegetative propagation. State ONE characteristic of the tissue of these structures, which facilitates this function (vegetative propagation).
15. 3(a)(iii)1 markState ONE function, other than vegetative propagation, that is often carried out by bulbs, corms and tubers.
16. 3(b)(i)4 marksBriefly describe FOUR MAIN features of the pollen grain shown in Figure 3.
17. 3(b)(ii)3 marksIn the box below, draw and label the structure of the pollen grain at the END of germination.
18. 3(b)(iii)2 marksState ONE major change that occurs when a pollen grain germinates and explain its significance.
19. 3(c)2 marksThe stigma plays an important role in fertilization by providing a location for the pollen to be deposited. Explain TWO other ways in which the stigma plays an important role in fertilization.
20. 4(a)(i)5 marksWith the aid of a simple diagram, describe the basic structure of a phospholipid. Detailed chemical formulae of the molecules are not required.
21. 4(a)(ii)4 marksPhospholipids are a major component of the plasma membrane of a cell and are arranged as a lipid bi-layer. With reference to the properties of phospholipids, explain why these lipids are arranged as a bi-layer in the…
22. 4(b)(i)4 marksOsmosis and endocytosis are cellular processes involved in the transport of materials across the plasma membrane. Describe TWO ways in which these processes differ.
23. 4(b)(ii)2 marksGive TWO examples of the use of endocytosis for the uptake of nutrients in animal systems.
24. 5(a)(i)2 marksExplain the terms 'vector' and 'recipient' as applied to genetic engineering.
25. 5(a)(ii)4 marksDiscuss the role played by E. coli (as a vector and recipient) in the production of insulin, utilizing genetic techniques.
26. 5(b)(i)4 marksDescribe the basic structure of RNA and explain how it differs from the structure of DNA.
27. 5(b)(ii)5 marksBoth DNA and RNA are involved in protein synthesis but they perform different roles. Differentiate between the roles played by DNA and RNA in protein synthesis.
28. 6(a)5 marksBriefly describe FIVE main regions which make up the human female reproductive system.
29. 6(b)4 marksSelect TWO of the regions described in (a) above. For EACH region, explain how its function is unique to females.
30. 6(c)6 marksDiscuss the principle of negative feedback mechanisms as applied to the secretion of follicle stimulating hormone and its role in the control of the menstrual cycle.