CAPE Biology Unit 1 · 2014 · Paper 2

26 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)1 markPrimary structure
2. 1(a)(ii)2 marksSecondary structure
3. 1(a)(iii)2 marksTertiary structure
4. 1(a)(iv)2 marksQuaternary structure
5. 1(b)3 marksWith reference to its protein structure, explain how the haemoglobin molecule functions in its essential role.
6. 1(c)(i)3 marksIdentify the organelles labelled A, B and C in Figure 1. A: B: C:
7. 1(c)(ii)2 marksCalculate the actual maximum length of the organelle labelled X to the nearest micrometre (µm). Show your working.
8. 2(a)(i)4 marksComplete Table 1 by writing the correct answers in the relevant spaces in the table.
9. 2(a)(ii)3 marksIn the box labelled A in Figure 2, sketch a diagrammatic representation of the tRNA molecule carrying the next amino acid to be added to the growing polypeptide chain.
10. 2(b)(i)2 marksBriefly explain the nature of the relationship between the alleles in the AB blood group.
11. 2(b)(ii)a)3 marksDeduce the blood genotype of the accused male which will clearly prove that he is NOT the father of the child. Give a brief explanation to justify your answer. Blood genotype of male (no symbols required): Justification:
12. 2(b)(ii)b)3 marksIf the male parent in (b) (ii) a) above has blood type B, demonstrate the inheritance of the blood type (O) of the child. Use the given symbols and a Punnett square.
13. 3(a)(i)6 marksMake a detailed labelled drawing of the region highlighted by Box X in Figure 4 B.
14. 3(a)(ii)3 marksUsing Figure 3 or Figure 4 as a guide, outline the key development stages of spermatozoa within the seminiferous tubule.
15. 3(b)(i)2 marksBriefly describe the results of this experiment shown in Figure 5.
16. 3(b)(ii)4 marksExplain the significance of this response for the pollination process.
17. 4(a)5 marksOutline the structure of a molecule of water and explain how this structure allows water to be an excellent solvent.
18. 4(b)4 marksDiscuss TWO major roles of water in cell function.
19. 4(c)6 marksDistinguish between endocytosis and exocytosis, and briefly comment on ONE cellular process that involves exocytosis.
20. 5(a)5 marksState FOUR observations and THREE deductions that formed the basis of Darwin's theory of natural selection.
21. 5(b)4 marksUse the theory of natural selection to explain how a new species can evolve from an existing one by allopatric (geographical) speciation.
22. 5(c)6 marksDiscuss THREE potential threats to humans, and other organisms, of the use of genetically modified crops. Include a definition of the term ‘genetically modified organism'.
23. 6(a)(i)3 marksExplain why vegetative propagation is NOT considered a form of sexual reproduction. Include in your explanation a brief definition of 'vegetative propagation'.
24. 6(a)(ii)4 marksComment on why vegetative propagation is especially beneficial to agriculturists and horticulturists. Limit your commentary to FOUR main points.
25. 6(b)(i)3 marksGive a concise explanation of how combined oral contraceptives work to prevent pregnancy.
26. 6(b)(ii)5 marksSuggest what advice should be given to the couple about the most appropriate way to use combined oral contraceptives. Include in your account, justification of your advice in relation to the physiological details…