A Series of Enzymes Catalyse the Reactions in the Metabolic

Multiple Choice

A series of enzymes catalyse 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. With respect to the enzyme that converts X to Y, substance A functions as ________.

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