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Enzyme Structure and Catalytic Efficiency
Grade Level
AP Biology
APB.167 Enzyme Structure and Catalytic Efficiency
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Under oxidative stress, an active-site cysteine forms a reversible sulfenic acid modification. Activity falls but returns when reducing conditions are restored. Which explanation is best?
A
Oxidative stress removes the enzyme's primary structure permanently in all cases.
B
The cysteine's chemical state temporarily changes, preventing its normal catalytic role until reduced.
C
The modification makes the substrate more concentrated, slowing the reaction.
D
Reducing conditions create new active sites unrelated to cysteine chemistry.
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