The diagram shows sucrose and sucralose. [Figure 12.1] The enzyme sucrase breaks down sucrose but cannot break down sucralose. Four students were asked to suggest why sucrase can break down sucrose but not sucralose. Three of the students gave correct suggestions. Which suggestion cannot be correct?
✓ Correct Answer
The correct answer is A: The Cl atoms change the shape of the sucralose molecule so it is not the same shape as the active site of sucrase.
📋 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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