Q. 87

B. Assertion and reason both are correct statements, but the reason is not the correct explanation for the assertion.

C. The assertion is a correct statement, but the reason is the wrong statement.

D. Assertion and reason both are incorrect statements.

E. The assertion is a wrong statement, but the reason is the correct statement.

Answer :

Enzymes do have active sites that hold substrate molecules for certain chemical reaction in a living organism.


This active site of enzymes usually holds the substrate molecule at a suitable orientation so that the substrate can interact with the reagent molecules.


Substrates bind to the active sites through ionic bond, H-bonding, van der Waals interaction or dipole-dipole interaction.


Whereas, drugs inhibit the activities of enzymes by blocking the active sites & prevent the binding of the substrate to the site and thus disrupts the catalytic activity of enzymes.


Therefore, drug’s competition with the suitable natural substrates by attaching covalently to active site of enzyme cannot be the reason for the given assertion statement.

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