O-LevelBiologyEnzymes5090/12 · May/June 2014 · Q41 Mark
The diagram represents the 'lock and key' mechanism of an enzyme that works best at pH7. [Figure 4 - Diagram showing an enzyme and a substrate, with specific shapes] What shows the enzyme and its substrate at pH 13?
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.
ADiagram showing an enzyme (E-shape) and a substrate (key-shape) that fit together.
BDiagram showing an enzyme (E-shape) and a substrate (key-shape) that do not fit.
CDiagram showing a denatured enzyme (C-shape) and a substrate (key-shape) that do not fit.
DDiagram showing a denatured enzyme (C-shape with an open top) and a substrate (key-shape with a narrow top) that do not fit.
✓ Correct answer
C: Diagram showing a denatured enzyme (C-shape) and a substrate (key-shape) that do not fit.
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