Chapter 4: Enzymes

A-level BiologyModule 2: Foundations6 topicsHigher

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Releases 1 August 2026

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Topic-aware long answers

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Enzymes: Long Answer Questions

Examiner-style long-answer practice with automatic marking, improvement advice and ProofCoach tracking.

4 questions15 marks38 min

standard / hard / synoptic

2 marksdefinestandardOCR A

Define or identify the key idea in active sites, then explain why it matters in Enzymes.

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3 marksexplainstandardOCR A

Proof Academy original experimental data

Condition	Measurement 1	Measurement 2	Mean
A	12.4	12.8	12.6
B	18.1	17.7	17.9
C	24.6	24.2	24.4

Using the stimulus where appropriate, explain the pattern or process involving temperature and pH in Enzymes.

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4 marksanalysehardOCR A

Trend from an OCR-style practical

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Analyse how inhibition affects the outcome in Enzymes. Include any relevant calculation, condition, diagram feature, or limitation.

State the relevant principle for inhibition.
Apply it to the data, diagram, or named example.
Give a justified conclusion.

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6 marksevaluatesynopticOCR A

Original clean exam diagram

thin barrierlarge surfaceblood supply

Evaluate the biological explanation for rate graphs in Enzymes. Your answer should be coherent, use precise exam-board terminology, and consider both method and evidence.

State the relevant principle for rate graphs.
Apply it to the data, diagram, or named example.
Give a justified conclusion.

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3. Biological Molecules

5. Plasma Membranes

Key learning objectives

Understand the key principles behind Enzymes.
Apply these ideas to exam-style questions.
Recall the essential definitions and key terms.

Condition

Measurement 1

Measurement 2

Mean

12.4

12.8

12.6

18.1

17.7

17.9

24.6

24.2

24.4