1.

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.

Answer»

Assertion and reason both are correct statement but reason does not explain assertion. 
Assertion and reason both are correct and reason explains the assertion. 
Both assertion and reason are wrong statement.
Assertion is correct statement reason is wrong statement.

Solution :Assertion is correct statement reason is wrong statement.
Correct reason : Drug compete with natural SUBSTRATE by attaching by WEAK BONDS such as hydrogen bond, Van der Waals. interaction and ionic bonding etc., to the active site of the enzyme.


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