CAPE Biology Unit 1 · 2003 · Paper 2

33 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)4 marksComplete the format below with the appropriate information in each square.
2. 1(b)1 markDraw the structural formula for each fatty acid.
3. 1(b)(i)2 marksStructural formula for fatty acid No. 1.
4. 1(b)(ii)2 marksStructural formula for fatty acid No. 2.
5. 1(c)2 marksState TWO advantages which animals derive from using fat as a storage material other than energy content, in preference to starch.
6. 2(a)3 marksMake an accurate drawing of the upper group of chromosomes in Figure 1 above, which are opposite to the micropylar end. Your drawing of the group of chromosomes should be THREE times larger than the group in the…
7. 2(a)(ii)1 markState the TYPE of division and the STAGE shown in Figure 1 on page 6.
8. 2(b)1 markWhat happens to the layer labelled L in Figure 1 on page 6, after fertilization?
9. 2(c)3 marksComplete the drawing below to show the contents of the ovary, and indicate by means of a rectangle drawn to scale, in ink, where the photograph of Figure 1 fits into your drawing. Label the rectangle "Import from Figure…
10. 2(d)2 marksExplain how the 6 nucleoli arise in this nucleus.
11. 3(a)(i)5 marksOn Figure 3, complete the histogram of the typical birth-weight of babies over a 10-year period. (Note that portions of this histogram have been pre-drawn.)
12. 3(a)(ii)5 marksAlso on Figure 3, construct a graph of the percentage mortality of babies in relation to birth-weight. (Use a best-fit graph line.)
13. 3(b)3 marksWith reference to the graphs drawn on page 10, comment on the effect of birth-weight on mortality.
14. 3(c)1 markWhat effect would the observations you made in (b) have on the gene pool controlling the birth-weight of the foetus?
15. 3(d)1 markWhat is this type of selection called?
16. 4(a)10 marksState briefly what is meant by the primary, secondary, tertiary and quaternary structure of proteins. Exemplify EACH answer by reference to the protein molecule, collagen.
17. 4(b)6 marksThe structure of collagen confers special properties which reflect its distribution in the body. Comment on this statement.
18. 4(c)4 marksDiscuss the outcome of this deficiency on the function of cellular ribosomes.
19. 4(c)(ii)4 marksDiscuss the outcome of this deficiency on the function of mitochondrial ribosomes.
20. 5(a)10 marksDescribe the structure of glucose, starch and cellulose and explain how these compounds function in living organisms.
21. 5(b)5 marksDiscuss how the properties of water have enabled EACH goldfish to survive in the contrasting conditions.
22. 5(c)5 marksUsing a comparison of the way fats and carbohydrates interact with water, suggest why fat is the BETTER energy storage material for the humming bird.
23. 6(a)6 marksUsing named flowering plants, describe TWO different methods used to promote cross pollination.
24. 6(b)4 marksDescribe the features of the human egg which enable it to carry out its function.
25. 6(c)10 marksThe uterus provides a safe place where the foetus can develop. Compare the contributions the amnion and the placenta make to the safety and development of the foetus.
26. 7(a)10 marksDescribe the roles of DNA, mRNA, rRNA and tRNA in the processes of transcription and translation.
27. 7(b)4 marksSuggest why this mutation has such severe effects on the individual.
28. 7(c)6 marksDiscuss the effect this compound would have on DNA and its replication and predict how RNA and its formation might be affected by this agent.
29. 8(a)10 marksDescribe the biological-species concept and state the limitations of this concept. Explain how new species are formed.
30. 8(b)5 marksSuggest how environmental factors act to preserve the alleles for both normal haemoglobin and sickle cell haemoglobin in native Africans living in Africa.
31. 8(c)5 marksDiscuss the advantages of sexual reproduction over asexual reproduction.
32. 9(a)10 marksGive an account of FIVE methods that may be used to conserve useful or valuable species.
33. 9(b)10 marksDesign a series of genetic crosses to demonstrate theoretically, how you could obtain plants which produce only red frilled flowers.