A-LevelBiologyEnzymesOct/Nov 2025Paper 1 Q131 Mark

What is the effect of an enzyme in an enzyme-catalysed reaction?

Q: What topic does this question test?

This question tests Enzymes in A-Level Biology (syllabus code 9700). It is worth 1 mark.

Adecreases the activation energy and decreases the energy yield

Bdecreases the activation energy and has no effect on the energy yield

Cincreases the activation energy and increases the energy yield

Ddecreases the activation energy and increases the energy yield

✓ Correct Answer

The correct answer is B: decreases the activation energy and has no effect on the energy yield

📋 Examiner Report & Trap Analysis

Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...

🎯 Mark Scheme Breakdown

Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.

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About This A-Level Biology Question

Topic

This multiple-choice question tests Enzymes in A-Level Biology (syllabus code 9700). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Biology Oct/Nov 2025 examination, Paper 1 Variant 2.

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