Question

By the action of enzymes, the rate of biochemical reaction
A. Does not change
B. Increases
C. Decreases
D. Either (a) or (c)

Answer 1

Hint: Protein is a naturally occurring and extremely complex substance that consists of amino acid residues. Proteins are present in all living organisms. Enzyme is a type of protein that acts as a catalyst in many chemical and biochemical reactions.

Complete Step by Step Solution:
Enzymes are a type of protein. It helps in several biological functions. Every living organism has enzymes in their body. Some common types of enzymes are as follows
- Amylase which is produced in the mouth.
- Pepsin which is produced in the stomach and helps in digestion.
- Trypsin which is produced in the pancreas.
- Pancreatic lipase which is produced in the pancreas.
- Deoxyribonuclease and ribonuclease which are produced in the pancreas.

Enzymes act as a catalyst. A catalyst is a substance that increases the rate of a reaction without itself being used up. The concentration of the catalyst remains unchanged after a reaction. Thus enzyme also acts as a catalyst in biochemical reactions and increases the rate of the reaction without itself being used up.
Thus the correct option is B.

Note: A catalyst is a substance that increases the rate of a reaction without itself being used up. A catalyst lowers the activation energy of a reaction and increases the rate of the reaction. Protein is present in hormones, enzymes etc. Enzymes also as a catalyst.