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What is the name of the process where structurally same compounds compete for the same site on an enzyme to inhibit that?

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What is the name of the process where structurally same compounds compete for the same site on an enzyme to inhibit that?

(a) Altered physiology

(b) Repression

(c) Non-competitive inhibition

(d) Competitive inhibition

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This interesting question is from Drugs Biotransformation in section Biotransformation of Drugs of Drug Biotechnology

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The correct choice is (d) Competitive inhibition

For explanation: Competitive inhibition results when structurally similar compounds compete for the same site on an enzyme. Such an inhibition due to substrate competition is reversible and can be overcome by a high concentration of one substrate. Methacholine inhibits the metabolism of acetylcholine by competing with it for cholinesterase.

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