A-LevelBiologyEnzymes9700/12 · May/June 2024 · Q81 Mark
The diagram shows naturally occurring D-glucose and a form of glucose that can be synthesised in the laboratory, known as L-glucose. [Diagram of D-glucose and L-glucose structures] The enzyme glucose oxidase catalyses the oxidation of D-glucose. The enzyme cannot catalyse the oxidation of L-glucose. Which statement about L-glucose explains this?
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.
AL-glucose does not fit into the active site of glucose oxidase.
BL-glucose has a different structural formula to D-glucose.
CL-glucose is a synthetic sugar.
DL-glucose is the mirror image of D-glucose.
✓ Correct answer
A: L-glucose does not fit into the active site of glucose oxidase.
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