Enzyme Kinetics MCAT Practice Question
A protein exhibits enzyme kinetics with a Hill coefficient (n) of 2.5 when measured against its substrate. The enzyme shows sigmoidal rather than hyperbolic substrate-velocity kinetics. In a physiological context, the enzyme's activity increases dramatically over a narrow range of substrate concentrations around the point of half-maximal velocity. This cooperative binding behavior is most critical for which type of metabolic regulation?
Answer choices
- AMaintaining constant flux through a linear pathway regardless of substrate concentration
- BReducing the Michaelis constant to increase substrate affinity
- CPreventing product inhibition through allosteric mechanisms
- DRapidly switching enzyme activity in response to small changes in substrate concentrationCorrect answer
- ECompeting with other enzymes for limited substrate availability
- FStabilizing enzyme activity at basal levels to prevent excessive metabolic flux
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