The mechanism by which the end product of a metabolic pathway inhibits an enzyme that catalyzes an earlier step in the pathway is most precisely described as
A)competitive inhibition.
B)cooperativity inhibition.
C)irreversible inhibition.
D)feedback inhibition.

Question

Quizplus · Accepted Answer

Feedback inhibition occurs when the end product of a metabolic pathway inhibits an enzyme that catalyzes an earlier step in the pathway, thereby regulating the overall pathway and preventing the accumulation of excessive levels of the end product. This is a reversible form of inhibition, as the inhibition is relieved when the concentration of the end product decreases. Competitive inhibition involves a molecule that competes with the substrate for binding to the active site of the enzyme, cooperativity inhibition involves other molecules binding to the enzyme and affecting its affinity for the substrate, and irreversible inhibition involves a molecule binding covalently to the enzyme and permanently deactivating it.

The Mechanism by Which the End Product of a Metabolic