CAPE Biology Unit 1 · May/June 2024 · 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)4 marksList FOUR properties of water which are important to life processes.
2. 1(a)(ii)4 marksDescribe how TWO properties of water are aided by the hydrogen bonding between water molecules.
3. 1(b)(i)2 marksDefine the term 'simple diffusion'.
4. 1(b)(ii)3 marksName the mechanisms by which the molecules move directly from A across the membrane to B, for EACH of the illustrations labelled X–Z in Figure 1.
5. 1(b)(iii)5 marksOutline a suitable procedure for investigating the tonicity of the three unknown solutions using the provided apparatus and materials (red onion, water, scalpel, distilled water, dropper, forceps, glass slides,…
6. 1(c)(i)3 marksBased on the structure of ergosterol compared with cholesterol shown in Figure 2, suggest the function of ergosterol in the cell membrane of yeast cells.
7. 1(c)(ii)9 marksExplain the functions of the THREE components of the cell membrane of the red blood cell as shown in Figure 3 based on the fluid mosaic model. Present your response in complete paragraphs.
8. 2(a)(i)2 marksState the expected offspring phenotype ratio of the test cross.
9. 2(a)(ii)4 marksComplete the shaded boxes in Table 1 to determine the value of chi-squared (χ²), to two decimal places.
10. 2(a)(iii)2 marksOutline a suitable conclusion based on the results obtained in (a)(ii), if the critical chi-squared value for three degrees of freedom at p = 0.05 is 7.82.
11. 2(b)(i)2 marksState TWO features of restriction enzymes.
12. 2(b)(ii)3 marksList THREE advantages associated with the use of genetically modified organisms.
13. 2(b)(iii)3 marksList THREE disadvantages associated with the use of genetically modified organisms.
14. 2(b)(iv)5 marksOn the grid provided on page 15, plot the data shown in Table 2 as a line graph and draw a curve of best fit.
15. 2(c)9 marksExplain if EACH of the methods shown in Figure 4 can produce DNA that the bacterium E. coli can use to make amylase on a large scale. Present your response in complete paragraphs.
16. 3(a)(i)3 marksIdentify the structures labelled U, V and W on the young ovule in Figure 5.
17. 3(a)(ii)4 marksDescribe EACH of the processes labelled X and Y in Figure 5.
18. 3(a)(iii)3 marksOn the diagram in Figure 5 on page 20, complete the diagram by drawing the nuclei in their correct positions in the developed embryo sac represented at Z.
19. 3(b)(i)5 marksDraw a diagram of the germinating lily pollen shown in Figure 6 in the space provided.
20. 3(b)(ii)3 marksFigure 6 shows the first of a sequence of events that occurs from pollination to fertilization in plants. Explain the importance of the pollen tube in fertilization.
21. 3(c)12 marksDiscuss how the structure of the human placenta enables it to carry out its functions of protection, production and transport. Present your response in complete paragraphs under the headings: Protection, Production, and…