A-LevelBiologyEnzymes9700/12 · May/June 2025 · Q161 Mark
Which graph correctly shows Km and Vmax? [Figure 16.1 (four graphs showing rate of reaction vs concentration, with Vmax and Km indicated)]
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.
AGraph A (rate of reaction vs concentration of enzyme, Vmax horizontal, Km on x-axis below Vmax line)
BGraph B (rate of reaction vs concentration of substrate, Vmax horizontal, Km on x-axis below half Vmax)
CGraph C (rate of reaction vs concentration of substrate, Vmax horizontal, Km on x-axis below Vmax line, with Vmax shown above plateau)
DGraph D (rate of reaction vs concentration of enzyme, Vmax horizontal, Km on x-axis below half Vmax)
✓ Correct answer
B: Graph B (rate of reaction vs concentration of substrate, Vmax horizontal, Km on x-axis below half Vmax)
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