A-LevelBiologyEnzymesMay/June 2020Paper 1 Q131 Mark
The diagram shows a metabolic pathway. [Figure 13.1] What would be the effect of adding a small amount of a non-competitive inhibitor of enzyme 2?
AEnzyme 2 would be partially denatured.
BSubstance X would increase in concentration.
CSubstance Y would no longer be formed.
DThe initial reactant would no longer be metabolised.
✓ Correct Answer
The correct answer is B: Substance X would increase in concentration.
📋 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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