Assertion (A) -Enzymes have active sites that hold substrate molecule for a chemical reaction.
Reason ( R) -Drugs compete with natural substrate by attaching covalently to the active site of enzyme.

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Both A and R are correct; R is the correct explanation of A

Both A and R are correct; R is not the correct explanation of A

A is correct; R is incorrect

R is correct; A is incorrect

answer is C.

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Detailed Solution

Enzyme hold the substrate for a chemical reaction. Active sites of enzymes hold the substrate molecule in a suitable position, so that it can be attacked by the reagent effectively. Substrates then bind to the active site of the enzyme though a variety of interactions such as ionic bond, hydrogen bonding, van der Waals’ interaction.

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