A-LevelBiologyEnzymes9700/12 · Oct/Nov 2022 · Q141 Mark
The Michaelis–Menten constant, Km, is the substrate concentration at which an enzyme works at half its maximum rate. What is correct when the Km value is low?
AThe enzyme has a low affinity for the substrate and the quicker the reaction will proceed to its maximum rate.
BThe enzyme has a low affinity for the substrate and the slower the reaction will proceed to its maximum rate.
CThe enzyme has a high affinity for the substrate and the quicker the reaction will proceed to its maximum rate.
DThe enzyme has a high affinity for the substrate and the slower the reaction will proceed to its maximum rate.
✓ Correct answer
C: The enzyme has a high affinity for the substrate and the quicker the reaction will proceed to its maximum rate.
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