plumiEnzymes and metabolism: OCR A‑Level Biology A questions
OCR A-Level Biology A past-paper questions on 2.1.4.1 Enzymes and metabolism, 2016–2025, with mark schemes and examiner’s reports where available.
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All 14 questions on Enzymes and metabolism, as a list
- June 2025, Paper 1, Q3 (1 mark): Which statement about the function of enzymes is not correct? A Enzymes affect the structure of whole organisms. B Enzymes build larger molecules from smaller m
- June 2025, AS Paper 2, Q3(a)(i) (2 marks): Enzymes can be used to extract proteins from plant cells. These proteins can be used for food products. The diagram shows how the enzyme pectinase can be used t
- June 2025, AS Paper 2, Q3(a)(ii) (6 marks): (ii)* The table shows some data on different methods that can be used to extract plant proteins. Protein source Extraction method Percentage yield of protein ex
- June 2024, Paper 1, Q21(b)(i) (2 marks): Explain why it is important that catalase is able to break down hydrogen peroxide very quickly. [2]
- June 2024, Paper 1, Q21(c)(i) (2 marks): Superoxide dismutase (SOD) is an enzyme that is often located together with catalase in cells. Superoxide ions are produced in mitochondria and are highly react
- June 2023, AS Paper 1, Q27(a)(i) (2 marks): Suggest how the activity of TET enzymes affects metabolism at both the cellular and whole organism level. [2]
- June 2023, AS Paper 1, Q27(a)(iii) (1 mark): Intracellular and extracellular reactions are catalysed by enzymes. The table lists three enzymes, including TET. Complete the table to indicate whether the enz
- June 2022, Paper 2, Q1 (1 mark): Many processes in the body are controlled by enzymes. Which of the options is an extracellular process controlled by enzymes? A Conversion of fibrinogen to fibr
- November 2021, AS Paper 2, Q3(b) (1 mark): Trypsin is an example of a protease enzyme found in the small intestine of mammals. Explain why trypsin is described as an extracellular enzyme. [1]
- November 2020, Paper 3, Q2(c) (1 mark): Creatine kinase (CK) is an enzyme that catalyses reactions in heart muscle. High levels of CK in the blood indicate that a person may have had a heart attack. S
- November 2020, AS Paper 1, Q25(b)(iii) (2 marks): Explain why enzymes are essential to all organisms. [2]
- June 2018, Paper 1, Q18(c) (1 mark): Cellulose cannot be digested by animals. Some mammals have bacteria in their stomachs that produce enzymes that can digest cellulose. Explain whether the action
- June 2017, AS Paper 1, Q10 (1 mark): A group of students was given a 1% solution of an unknown digestive enzyme. They were also given three tubes containing an identical mixture of foods. The stude
- June 2016, AS Paper 2, Q4(a)(ii) (1 mark): The region of yellow staining shown in Fig. 4 includes part of the agar where the fungus had not yet grown. What does this pattern indicate about the action of
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