MCAT Biology Question — DFP
- Oct 17, 2014
- MCAT Question of the Day
A) Competitive inhibition
B) Noncompetitive inhibition
C) Irreversible inhibition
D) Partially competitive inhibition
The binding described involves the inhibitor binding to the enzyme and rendering the enzyme permanently inactive. That’s the definition of irreversible inhibition.
A: Competitive inhibitors bind to the active site but bind reversibly: they do not permanently disable the enzyme. By adding very high levels of the normal substrate, the effects of competitive inhibitors can be overcome.
B: Noncompetitive inhibitors bind to a site other than the active site.
D: Partially competitive inhibitors bind to a site other than the active site and allow the enzyme to still have some catalytic activity (typically reduced, but possible to be higher).
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