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Section 3 · Biological sciences
Mock exam 04
38:12 remaining
Which change to the enzyme's active site best explains the drop in reaction rate at pH 8.4?
Protonation of a histidine residue disrupts substrate binding
The substrate concentration falls below Km
Denaturation of the tertiary structure is irreversible
Accuracy this week
0%
Streak
12 days
Students preparing for
MonashUniversity of MelbourneUWADeakinGriffithWollongong
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GAMSAT 76 · Monash entry 2026

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Why is answer B wrong here? I got it down to B and C.
B assumes Km changes with pH — it does not. The active site charge does.
That clicks. Thanks.

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