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. What is substance X?
A) an allosteric inhibitor
B) a substrate
C) an intermediate
D) the product

Question

Quizplus · Accepted Answer

Substance X is the substrate, as it is being converted to Y by the enzyme. Product A binds to the enzyme at a remote site, indicating that it is an allosteric inhibitor, reducing the enzyme's activity. Thus, options A, C, and D are incorrect.

A Series of Enzymes Catalyse the Reactions in the Metabolic