Chapter 20, Problem 20.75E

In the multienzyme sequence shown below, molecules of D are able to fit to the enzyme ${\text{E}}_{\text{1}}$ and prevent the conversion of A to B. What is this action of E called?

$\text{A}\stackrel{{\text{E}}_{\text{1}}}{\to }\text{B}\stackrel{{\text{E}}_2}{\to }\text{C}\stackrel{{\text{E}}_3}{\to }\text{D}$

a. effector inhibition

b. allosteric inhibition

c. feedback inhibition

d. competitive inhibition by nonproduct