If an enzymatic reaction was controlled by feedback inhibition, we would expect it to stop
A) only if the substrate was exhausted.
B) when the cofactors are exhausted.
C) when the product changed the pH.
D) as soon as a critical level of end product builds up.
E) only if a metabolic poison is added.

Question

Quizplus · Accepted Answer

Feedback inhibition occurs when a build-up of the end product of a metabolic pathway acts as an inhibitor of an earlier enzyme in the pathway. This mechanism helps regulate the rate of production of the end product. Therefore, we would expect the reaction to stop as soon as a critical level of end product builds up.

If an Enzymatic Reaction Was Controlled by Feedback Inhibition, We