A Series of Enzymes Catalyze the Reactions in the Metabolic

Multiple Choice

A series of enzymes catalyze the reactions in the metabolic pathway X → Y → Z → A. Product A binds to the enzyme that converts X to Y at a position remote from its active site. This binding decreases the activity of the enzyme. What does substance X represent in this pathway?

A) an allosteric inhibitor
B) a substrate
C) an intermediate
D) the product