A-LevelBiologyEnzymes9700/12 · Feb/Mar 2018 · Q141 Mark
The diagram shows an enzyme, its substrate and an enzyme/substrate complex. [Figure showing enzyme, substrate, and enzyme/substrate complex] Which statement explains how the substrate is able to enter the active site of the enzyme?
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.
AContact between the substrate and the enzyme causes a change in the enzyme shape.
BThe shape of the active site and the shape of the substrate are complementary.
CThe substrate within the active site forms hydrogen bonds with amino acids.
DWhen the enzyme/substrate complex forms, the tertiary structure of the enzyme changes.
✓ Correct answer
A: Contact between the substrate and the enzyme causes a change in the enzyme shape.
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