A-LevelBiologyEnzymesOct/Nov 2010Paper 1 Q111 Mark
A fixed volume of the enzyme catalase was added to a fixed volume of hydrog solution. The diagram shows how the rate of the reaction changed over the cour reaction. [Figure 11.1 showing a graph of rate of reaction vs time] Why did the actual rate of reaction decrease over time?
AThe enzyme active sites become saturated.
BThe enzymes were denatured.
CThe product inhibited the reaction.
DThe substrate molecules were used up.
✓ Correct Answer
The correct answer is D: The substrate molecules were used up.
📋 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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