Question

Non-protein part of the enzyme is known as
A) Holoenzyme
B) Apoenzyme
C) Cofactor
D) All of the above

Answer 1

Hint: Enzymes are the biomolecules which catalyses the bio reactions inside the cell. They speed up the rate of chemical reactions. They play a vital role in the metabolism processes.

Complete Answer:
- The enzymes are protein. They are the biocatalyst which accelerates the rate of reaction. The molecule on which the enzyme acts is called the substrate.
- The enzyme converts this substrate to products. The enzymes fasten the substrate to product conversion reaction but it does not get utilised in the reaction.
- All the metabolic processes require enzymes to carry out the reactions.
For example- In the stomach, pepsin is the enzyme used for the breakdown of proteins present in the food.
- Apoenzymes are enzymes. It is present in the inactivated form. It gets activated by the non-protein factor called the cofactor. An apoenzyme together with a cofactor is called a holoenzyme.

Thus the correct answer is (C). The non-protein part of an enzyme is called a cofactor.

Additional Information: All enzymes are proteins but all proteins are not enzymes. The enzymes are dependent on various factors like temperature, pH, and substrate concentration. High temperature changes the structure of enzymes.

Note: Enzymes are the protein. The main function of enzymes is to catalyse a biochemical reaction. They increase the rate of forward reaction. Few examples of enzymes are cellulose, lipase, pepsin, rennin, amylase etc.