CAPE Biology Unit 1 · May/June 2019 · Paper 2

21 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 marksConstruct a tissue diagram from the light micrograph of the plant section in Figure 1.
2. 1(a)(ii)5 marksProvide annotations to describe EACH labelled structure, A–E in Figure 1.
3. 1(b)(i)2 marksDescribe the changes in the rate of uptake of Substance A and Substance B as solute concentration increases as depicted in Figure 2.
4. 1(b)(ii)2 marksIdentify the types of diffusion illustrated for Substance A and Substance B in Figure 2.
5. 1(b)(iii)4 marksCompare and contrast the two types of diffusion identified in (b)(ii).
6. 1(b)(iv)6 marksArrange CO2, glucose, water, and RNA in order of ability to diffuse through a lipid bilayer, starting with the easiest, and explain the order.
7. 1(c)8 marksWith the aid of an annotated diagram, explain the organization of membrane lipids, and discuss the structure of a cell membrane specifying lipid organization and protein associations.
8. 2(a)(i)6 marksPlot a line graph on the grid provided showing the relative growth rate (y-axis) vs tetracycline concentration (x-axis) for both the sensitive and resistant strains of bacteria.
9. 2(a)(ii)4 marksOutline the effect of antibiotic concentrations of 0.1 ug/ml and 0.7 ug/ml on BOTH bacterial populations.
10. 2(a)(iii)4 marksExplain how the differences between the growth rates of the bacteria could lead to natural selection.
11. 2(b)(i)2 marksComplete the missing codons in the boxes labelled A and B in Figure 3.
12. 2(b)(ii)6 marksWith reference to the mutation in Figure 3, explain how mutation brings about genetic variation at the DNA, protein and cellular level.
13. 2(c)8 marksDiscuss the process of natural selection as proposed by Darwin to be the mechanism of evolutionary change.
14. 3(a)(i)5 marksDraw a well-labelled flow diagram of the process of oogenesis starting from the primary oocyte.
15. 3(a)(ii)2 marksState the role of ONE named hormone in oogenesis.
16. 3(a)(iii)4 marksProvide annotations on ONE function of EACH of the structures labelled A–D in the diagram of a sperm cell shown in Figure 4.
17. 3(a)(iv)2 marksRelate any ONE structural feature of a sperm cell to its functions.
18. 3(b)(i)3 marksComplete the table to show the extent of fertilization possible between the given genotypes of the parents using -, +, or -+.
19. 3(b)(ii)6 marksDifferentiate between: self-incompatibility and male sterility; monoecy and dioecy; and protandry and protogyny.
20. 3(c)(i)4 marksExplain TWO major genetic consequences of self-pollination.
21. 3(c)(ii)4 marksExplain TWO major genetic consequences of cross pollination.