A-LevelBiologyEnzymesOct/Nov 2023Paper 1 Q131 Mark
The graph shows the results of two experiments on the effect of increasing substrate concentration on the rate of an enzyme-catalysed reaction. One experiment was at a high concentration of enzyme and the second was at a low concentration of enzyme. All other variables were standardised. [Figure 13.1] What would limit the initial rate of reaction at point X?
Aenzyme concentration
BpH
Csubstrate concentration
Dtemperature
✓ Correct Answer
The correct answer is A: enzyme 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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