Question

Some drugs bind to a site other than the active site of an enzyme. This site is known as

• A. non-active site
• B. allosteric site
• C. competitive site
• D. therapeutic site

Answer 1

The Correct Option is B

In the context of enzyme activity, several types of sites are relevant to how substrates and other molecules interact with enzymes. The specific site where a substrate binds to an enzyme is called the active site. However, there are other sites on enzymes where molecules can bind, influencing the enzyme's activity without interacting directly with the active site.

The correct answer to the question is allosteric site.

Explanation:

• The allosteric site is a site on an enzyme where a molecule can bind, causing a change in the enzyme's conformation and activity. This can either activate or inhibit the enzyme's activity, depending on the nature of the allosteric regulator. This site is distinct from the active site where substrates bind.
• By contrast, a non-active site isn't a standard term commonly used in biochemical contexts for enzyme interactions, making it an unlikely option.
• The competitive site typically refers to the active site in many contexts since competitive inhibitors bind directly there, blocking substrate access.
• Finally, the term therapeutic site is not used in the context of enzyme function or its interaction with drugs or substrates; thus, it is not applicable here.

Conclusively, the term allosteric site appropriately describes the site where molecules bind to influence the enzyme indirectly, which aligns with the description given in the question.