Quelpr
2 marksEnzymes

CAPE Biology Unit 1 · May/June 2025 · Paper 2 · Question 1(a)(iv)

Enzymatic cleavage of biological polymers and energy yield of macromolecules.

Calculate the rate of reaction of the enzyme based on the graph shown in Figure 1.

This question uses a figure or table from the paper — you'll see it when you practise.

The mark scheme is shown once you've answered.

Practise this question

Other parts of this question

  1. 1(a)(i)Define the term 'activation energy'.[2 marks]
  2. 1(a)(ii)Outline TWO features of triglycerides that facilitate their ability to release more energy per gram than carbohydrates when catabolized.[4 marks]
  3. 1(a)(iii)Outline 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…[5 marks]
  4. 1(b)(i)State ONE reason why curve Y is MOST likely showing enzyme activity that is inhibited.[1 mark]
  5. 1(b)(ii)Describe the action of EACH of the following inhibitors: - Organophosphate - Antabuse[4 marks]
  6. 1(b)(iii)Explain whether the type of inhibition shown in Figure 2 on page 8 is competitive or non-competitive.[3 marks]
  7. 1(c)Using Figure 3 and the provided information, explain how EACH mitochondrial protein moves molecules across the membrane differently in complete paragraphs: -…[9 marks]

More practice: the rest of this paper · more Enzymes questions · all CAPE Biology Unit 1 past papers