A-LevelBiologyEnzymes9700/12 · May/June 2019 · Q101 Mark
A fixed volume of the enzyme catalase was added to a fixed volume of hydrogen peroxide solution. The diagram shows how the concentration of product changed over the course of the reaction. [Figure: Graph showing concentration of product vs time] What explains the shape of this graph?
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 active sites become saturated.
BThe enzyme was denatured.
CThe hydrogen peroxide inhibited the reaction.
DThe substrate molecules were used up.
✓ Correct answer
D: The substrate molecules were used up.
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