Two enzymes, X and Y, were used in an experiment. Enzyme X was from bacteria that live in rivers and lakes at temperatures from 5°C to 20 °C. Enzyme Y was from bacteria that live in hot water springs at temperatures from 40°C to 85 °C. The experiment measured the concentration of product produced by each enzyme at temperatures between 0°C and 100°C after 5 minutes. Which graph shows the results? [Figure 11.1]
✓ Correct Answer
The correct answer is B: Graph B: X with optimum around 15°C, Y with optimum around 60°C, Y having a higher maximum product concentration than X.
📋 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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