A-LevelBiologyEnzymesOct/Nov 2025Paper 1 Q141 Mark
How is the Michaelis–Menten constant (Kₘ) used?
Ato determine the number of collisions between the enzyme and substrate
Bto compare the affinity of enzymes for their substrates
Cto find the maximum velocity of an enzyme (Vₘₐₓ)
Dto find the optimum rate of reaction
✓ Correct Answer
The correct answer is B. This question tests the candidate's understanding of enzymes within the Biologysyllabus. The examiner's mark scheme requires...
📋 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...
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