Question

Drugs that bind to the receptor site and inhibit its natural function are called .

• A. enzymes
• B. antagonists
• C. molecular targets
• D. agonists

Hint:

Think of the receptor as a lock: - An Agonist is a duplicate key that opens the lock. - An Antagonist is a broken key that gets stuck in the lock; it doesn't open it, but it prevents the real key from being inserted.

Answer 1

The Correct Option is B

Concept: Drugs interact with biological targets such as receptors to produce a therapeutic effect. Receptors are proteins that receive chemical signals (like hormones or neurotransmitters) and translate them into a cellular response.
• Agonists: These are drugs that mimic the natural messenger by switching on the receptor. They bind to the receptor and produce a response similar to that of the natural chemical messenger. • Antagonists: These drugs bind to the receptor site but do not activate it. Instead, they occupy the site and "block" the natural messenger from binding. By doing so, they inhibit the natural function of the receptor.
• Enzymes: These are biological catalysts, not the receptors themselves. • Molecular targets: This is a general term for any biological molecule (like enzymes, receptors, or nucleic acids) that a drug interacts with. Conclusion: Since the question describes drugs that bind and inhibit function, the correct term is antagonists.