Assertion : With the increase in substrate concentration, the velocity of the enzymatic reaction rise at first. The reaction ultimately reaches a maximum velocity which is not exceeded by any further rise in concentration of the substrate.
Reason : The enzyme molecules are fewer than substrate molecules and after saturation of thes molecules, there are no free enzymes to bind with the additional substrate molecules.

Options

A. If both assertion and reason are true and the reason is the correct explanation of the assertion
B. If both assertion and reason are true and the reason is not the correct explanation of the assertion
C. If assertion is true but reason is false
D. If both assertion and reason are false

Answer

A

Explanation

(A) with the increases substrate concentration, the velocity of the enzymatic reactions rises at first. The reaction ultimately reaches a maximum velocity which is not exceeded by any further rise in concentration of the substrate because the enzyme molecule is fewer than substrate molecules and after saturation of these molecules, there are no free enzymes to bind with the additional substrate molecules.