Raising the substrate concentration largely reverses the effect of inhibitor X on an enzyme, and the maximum rate (Vmax) is unchanged. Which description of inhibitor X fits best?
Answer and explanation
Correct answer: A. Competitive
- Step 1: If extra substrate overcomes the inhibition, the inhibitor and substrate compete for the same active site.
- Step 2: A competitive inhibitor leaves Vmax unchanged but raises the apparent Km, because more substrate is needed to reach half of Vmax.
- Step 3: This matches the competitive type.
Answer
Competitive.
Why not the others: non-competitive inhibition lowers Vmax and is not reversed by substrate; uncompetitive inhibition lowers both Vmax and Km; irreversible inhibition removes enzyme permanently.
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