O-LevelBiologyEnzymes5090/11 · May/June 2022 · Q51 Mark
The graph shows how the rate of reaction of a protease from the stomach varies with pH. [Figure 5.1] What describes the pH at point X?
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 highest pH at which this enzyme is active
Bthe lowest pH that does not destroy the enzyme
Cthe pH at which the substrate starts to run out
Dthe pH that produces the highest rate of enzyme activity
✓ Correct answer
D: the pH that produces the highest rate of enzyme activity
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