CAPE Biology Unit 1 · 2005 · 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)6 marksOn the graph grid provided, plot a graph of the relative rates for BOTH salivary amylase and arginase.
2. 1(b)(i)1 markUsing the graph, determine the optimal pH for arginase activity.
3. 1(b)(ii)1 markUsing the graph, determine the optimal pH for salivary amylase activity.
4. 1(c)1 markDetermine the optimal pH at which BOTH of these enzymes together digest compound X.
5. 1(d)1 markName TWO factors, in addition to pH, that can affect an enzyme's catalytic activity.
6. 2(a)3 marksWrite the circled symbol for EACH hormone on the graph in Figure 1 at the exact day where the hormone is at its maximum concentration during the menstrual cycle. (You may sketch in the graph lines to assist you if you…
7. 2(b)(i)3 marksIn the space provided below, at a magnification of 0.5, draw a plan diagram of the ovary in Figure 2 to show the distribution of the major tissues.
8. 2(b)(ii)3 marksIdentify structures 1 to 6 in Figure 2.
9. 2(c)1 markIf the length of the human ovary is 3.5 cm, what is the magnification of your drawing in (b)(i)?
10. 3(a)3 marksUsing any feature of the pollen grains shown in Figure 3, create a set of dichotomous keys to distinguish between the plants by means of their pollen grains.
11. 3(b)6 marksUsing your knowledge of the distinguishing features of the kingdoms and clearly stating which features have been used, determine to which kingdom EACH of the cells in Figure 4 belongs.
12. 3(c)1 markList the SEVEN categories used in modern classification, starting with the broadest and proceeding to the narrowest category.
13. 4(a)8 marksDraw a large, labelled diagram to show the structure and composition of the fluid mosaic membrane. Describe the function of FOUR of the labelled structures.
14. 4(b)6 marksDiscuss the processes involved and give reasons for these results.
15. 4(c)6 marksDiscuss the mode of operation of primary pumps for moving ions in and out of cells.
16. 5(a)10 marksDescribe the structure and function of EACH of the following: (i) Endoplasmic reticulum (ii) Golgi apparatus (iii) Nucleus (iv) Chloroplasts (v) Mitochondria
17. 5(b)4 marksWith reference to the resolving power of the light microscope, and the electron microscope, explain the use and importance of microscopes in biology.
18. 5(c)6 marksClearly indicate if EACH structure in the list is an organ or a tissue. Give TWO reasons for EACH choice.
19. 6(a)3 marksGive the names of THREE hormones which control sperm production. State the origin and effect of EACH.
20. 6(b)7 marksDescribe the meiotic sequence which occurs in spermatogenesis in the primary spermatocyte from Prophase I to late Anaphase I.
21. 6(c)(i)2 marksWhat structural features or conditions of the female reproductive system must sperm overcome in order to reach from the vagina to the fertilization site?
22. 6(c)(ii)8 marksFor EIGHT contraceptive methods, comment on the structural or physiological means by which they prevent fertilization.
23. 7(a)10 marksDescribe the stages of mitosis and indicate clearly how this process ensures that EACH daughter nucleus receives a full set of chromosomes.
24. 7(b)(i)2 marksDiscuss why damage to the heart and the nervous system (for example, during a stroke) is dangerous.
25. 7(b)(ii)2 marksSuggest the effects that would occur if mitosis in skin epidermis were blocked.
26. 7(c)6 marksExplain the degree of genetic variability that occurs among asexually reproducing organisms, self-fertilizing organisms and bisexual (male and female) organisms. Give reasons for the degree of genetic variability that…
27. 8(a)10 marksUsing ONE example of epistasis, explain how and why the F2 phenotypes of a dihybrid cross might fail to show the normal 9:3:3:1 ratio for the two characters.
28. 8(b)(i)6 marksShow how you would set out a table to apply the formula: x² = Σ ((O-E)²/E) to find the value of x² where O is the observed and E the expected result.
29. 8(b)(ii)4 marksOnce x² is known, how would you use a table of x² values to determine the probability that the difference between observed and expected results is due to chance alone?
30. 9(a)(i)6 marksDescribe the THREE types of natural selection.
31. 9(a)(ii)4 marksExplain how environmental factors can act as forces of natural selection.
32. 9(b)(i)5 marksIdentify the TYPE of speciation that occurred and indicate the mechanisms that contributed to it.
33. 9(b)(ii)5 marksIdentify the type of speciation that occurred and indicate the mechanisms that contributed to it.