The reaction catalyzed by enolase .

Question

The reaction catalyzed by enolase                          .

BlackTom AI · Accepted Answer

The question asks about the reaction catalyzed by enolase and which catalytic features it exhibits.
Option A: 'demonstrates acid-base catalysis' — Enolase does participate in acid-base chemistry during the dehydration of 2-phosphoglycerate, acting via active-site residues that donate and accept protons. However, this alone does not capture all aspects of the catalytic mechanism, so this statement is incomplete.
Option B: 'All of these' — This option asserts that enolase uses multiple catalytic strategies. Since enolase employs both acid-base catalysis and metal ion catalysis as part of its mechanism, this broader claim accurately reflects the enzyme's catalytic repertoire.
Option C: 'demonstrates metal ion catalysis' — Enolase requires a divalent metal ion cofactor (commonly Mg2+) that coordinates substrate and assists in stabilization of charged intermediates, representing metal ion catalysis. Like Option A, this is true but incomplete on its own.
In summary, Options A and C each identify a valid aspect of enolase's catalysis, but neither alone fully describes the enzyme’s mechanism. The correct choice encompasses both features, aligning with Option B (All of these).

The reaction catalyzed by enolase .单项选择题

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