A-LevelBiologyEnzymesFeb/Mar 2016Paper 1 Q131 Mark
Which statement correctly describes the action of competitive enzyme inhibitors?
AThey bind permanently to the active site.
BThey change the shape of the active site.
CThey limit the formation of enzyme-substrate complexes.
DThey lower the activation energy of the reaction.
✓ Correct Answer
The correct answer is C: They limit the formation of enzyme-substrate complexes.
📋 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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