Active enzyme + ( → ( + (
a. (1) product (2) substrate (3) active enzyme

(1)Substrate, (2)Product and (3) active enzymes.

Explanation:

Enzymes are bio catalysts that increases the rate of a biochemical reactions. The enzymes has the ability to work at specific temperature and pH conditions only.

The enzyme binds with the substrate in a biochemical reaction and decreases the activation energy of the reaction. After that the substrate is converted into the product and active enzyme leaves the reaction.

Thus, the correct answer is (1)Substrate, (2)Product and (3) active enzymes.