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. This question tests the candidate's understanding of enzymes within the Biologysyllabus. The examiner's mark scheme requires...
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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...
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