What type of compound the Keratin is?

Keratin is a structural protein found in hair, nails, wool, and the outer layer of skin.

Based on their molecular shape, proteins are classified into fibrous and globular proteins.

Fibrous proteins consist of linear polypeptide chains that run parallel to each other and are held together by hydrogen and disulfide bonds, forming a fiber-like structure. They are generally insoluble in water.

Keratin and myosin are classic examples of fibrous proteins.

Answer: fibrous protein