O-LevelBiologyEnzymes5090/11 · May/June 2023 · Q61 Mark
The graph shows the effect of substrate concentration on the rate of an enzyme-controlled reaction. The results have been obtained using a fixed concentration of enzyme at a temperature of 30 °C. Which statement explains the shape of the graph from X to Y?
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.
ADenaturation of the enzyme molecules is increasing.
BThe enzyme active sites are not all occupied.
CThe concentration of substrate molecules is decreasing.
DThe frequency of effective collisions between enzyme active sites and substrate molecules is decreasing.
✓ Correct answer
B: The enzyme active sites are not all occupied.
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