Answer: Option (a) is the correct option.
Explanation:
Enzymes are the catalysts which helps in completion of biochemical reactions in a living organism.
Binding between the active site of an enzyme and a substrate molecule is described by the lock and key hypothesis. It states that fixed structure of an active site behaves as a lock which exactly matched the structure of a specific substrate that behaves as a key.
There is a specific enzyme for each biological function because of its structure as an active site is present in every enzyme. This active site reacts with the reactant molecules which results in the formation of a reaction intermediate.
Thus, the speed of reaction increases and products are obtained quickly.
