A-LevelBiologyEnzymes9700/12 · Oct/Nov 2010 · 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?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
AThe enzyme active sites become saturated.
BThe enzymes were denatured.
CThe product inhibited the reaction.
DThe substrate molecules were used up.
✓ Correct answer
D: The substrate molecules were used up.
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