CAPE Biology Unit 1 · May/June 2025 · Paper 2

22 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)2 marksDefine the term 'activation energy'.
2. 1(a)(ii)4 marksOutline TWO features of triglycerides that facilitate their ability to release more energy per gram than carbohydrates when catabolized.
3. 1(a)(iii)5 marksOutline a suitable procedure to investigate the activity of amylase on a suspension of starch at 10 °C, 20 °C, 30 °C and 40 °C, including all relevant materials and apparatus and KI/I solution.
4. 1(a)(iv)2 marksCalculate the rate of reaction of the enzyme based on the graph shown in Figure 1.
5. 1(b)(i)1 markState ONE reason why curve Y is MOST likely showing enzyme activity that is inhibited.
6. 1(b)(ii)4 marksDescribe the action of EACH of the following inhibitors: - Organophosphate - Antabuse
7. 1(b)(iii)3 marksExplain whether the type of inhibition shown in Figure 2 on page 8 is competitive or non-competitive.
8. 1(c)9 marksUsing Figure 3 and the provided information, explain how EACH mitochondrial protein moves molecules across the membrane differently in complete paragraphs: - Fatty acid transporter - Potassium–hydrogen ion exchanger -…
9. 2(a)(i)4 marksName EACH of the stages of meiosis labelled P–S in Figure 4.
10. 2(a)(ii)5 marksIn the box provided, draw a diagram of Stage P as shown in Figure 4.
11. 2(a)(iii)3 marksExplain how Stage R shown in Figure 4 produces genetic variation in meiosis.
12. 2(a)(iv)4 marksOutline ONE difference between EACH of the following pairs of terms: - Chromatin and chromosome - Haploid and diploid
13. 2(b)4 marksDiscuss why the formation of a chiasma is important in meiosis but does not occur in mitosis.
14. 2(c)(i)2 marksDefine the term 'genetically modified'.
15. 2(c)(ii)8 marksDiscuss ONE possible social implication and ONE possible environmental implication if farmers were allowed to plant genetically modified soya bean in the Caribbean, using the provided text and data from Table 1 and…
16. 3(a)(i)1 markName the structure labelled X in Figure 5.
17. 3(a)(ii)6 marksOutline THREE ways in which the endosperm contributes to the development of the seed.
18. 3(a)(iii)3 marksList THREE advantages of sexual reproduction in plants.
19. 3(b)(i)6 marksExplain ONE possible positive implication and ONE possible negative implication of the use of this contraceptive method in preventing unwanted pregnancy.
20. 3(b)(ii)1 markRecommend ONE way in which the pill may be improved to ensure that it prevents unwanted pregnancies.
21. 3(c)(i)5 marksOn the grid provided on page 23, plot a line graph to show the change in levels of oestrogen and progesterone during Jennifer's menstrual cycle.
22. 3(c)(ii)8 marksDiscuss the likelihood of EACH woman becoming pregnant based on the quantity of hormones produced as shown in Table 3 on page 22 in complete paragraphs.