plumiMechanism of enzyme action: OCR A‑Level Biology A questions
OCR A-Level Biology A past-paper questions on 2.1.4.2 Mechanism of enzyme action, 2016–2025, with mark schemes and examiner’s reports where available.
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Q16(c)(ii)
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All 6 questions on Mechanism of enzyme action, as a list
- June 2024, Paper 1, Q16(c)(ii) (1 mark): The enzyme maltase converts maltose to glucose during the final stages of starch digestion in the small intestine. Suggest why maltotriose can also be converted
- June 2023, AS Paper 1, Q22(a)(i) (1 mark): Name the hypothesis of enzyme action that is supported by the mechanism observed in chitinase. [1]
- June 2023, AS Paper 1, Q22(a)(ii) (2 marks): Explain how the mechanism of enzyme action observed in chitinase increases the rate of chitin breakdown. [2]
- November 2021, Paper 1, Q4 (1 mark): Which of the statements about enzyme catalysed reactions is true? A Binding of a substrate to the active site can weaken bonds in the substrate. B Enzymes allow
- November 2021, Paper 1, Q18(b) (3 marks): Liver is a rich source of the enzyme catalase. The table below describes examples of three terms from the list below. coenzyme competitive inhibition enzyme-pro
- June 2016, AS Paper 2, Q4(c) (6 marks): (c)* There are two models for the mechanism of enzyme action. Outline how changes in temperature can affect these mechanisms of lipase action. [6]
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