The rate of enzyme reactions rises with the i | vedclass

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Question

(B) The rate of an enzymatic reaction increases with an increase in substrate concentration because more enzyme active sites are occupied by substrate

Vedclass · Accepted Answer

Free enzyme molecules to bind with substrate are not available.

Vedclass · Answer

(B) The rate of an enzymatic reaction increases with an increase in substrate concentration because more enzyme active sites are occupied by substrate molecules.However,once all the active sites of the enzyme molecules are saturated with substrate molecules,the reaction rate reaches its maximum velocity $(V_{max})$.Beyond this point,adding more substrate does not increase the reaction rate because there are no free enzyme molecules available to bind with the additional substrate molecules.Therefore,the correct reason is that free enzyme molecules to bind with substrate are not available.

The rate of enzyme reactions rises with the increase in substrate concentration. But it does $NOT$ increase beyond a certain concentration because . . . . . . .

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