A-LevelBiologyEnzymes9700/12 · May/June 2011 · Q141 Mark
The graphs show the effects of temperature and pH on enzyme activity. [Figure: Two graphs, one of rate of reaction vs temperature with points P and Q, another of rate of reaction vs pH with points R and S] Which statement explains the enzyme activity at the point shown?
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.
AAt P, hydrogen bonds are formed between enzyme and substrate.
BAt Q, the kinetic energy of enzyme and substrate is highest.
CAt R, peptide bonds in the enzyme begin to break.
DAt S, the enzyme is completely denatured.
✓ Correct answer
A: At P, hydrogen bonds are formed between enzyme and substrate.
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