BIOMOLECULES AND ENZYMES

Detailed explanation-1: -keratin, fibrous structural protein of hair, nails, horn, hoofs, wool, feathers, and of the epithelial cells in the outermost layers of the skin.

Detailed explanation-2: -Myosin, collagen and keratin are all examples of structural proteins. Myosin is the major constituent of muscles, collagen is majorly present in connective tissue, and keratin is an integral part of hair and outer layers of skin.

Detailed explanation-3: -Keratin is the name given to a large family of homologous proteins that have a filamentous (fibrous) structure. These proteins are expressed in epithelial cells and in epidermal cells where they are assembled forming cytoskeletal structures within the cell and epidermal derivatives such as hair, nail and horn.

Detailed explanation-4: -Keratins are considered examples of scleroproteins or albuminoids. The protein is rich in sulfur and insoluble in water. The high sulfur content is attributed to the richness of the amino acid cysteine.