Below Is a Metabolic Pathway Having 3 Chemical Reactions and 3

question 73

Multiple Choice

Below is a metabolic pathway having 3 chemical reactions and 3 enzymes. Enzyme 1 has 2 binding sites--1 for the substrate A and another for the end product D. As the pathway proceeds, the end product in higher quantities will react with enzyme 1, blocking the enzyme's binding to the substrate.
Which statement is true about this pathway?

$\quad$$\quad$$\quad$ enz1 $\quad$ enz2 $\quad$ enz3
Substrate A --> B --> C --> D end product

• A) This is a case of noncompetitive inhibition.
• B) As a result of the inhibition of the enzyme, there will eventually be less substrate converted to the end product D.
• C) Enzyme 1 has an active site and a regulatory site.
• D) All of the choices are correct.

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