Keratin is a: (A) Globular protein, (B) Cylindrical protein, (C) Fibrous protein, (D) None of the above
Answer is C. Fibrous proteins: When the axial ratio of length: width of a protein molecule is more than 10, it is called a fibrous protein. Examples: a-keratin from hair, collagen.Ref: Textbook of medical biochemistry, MN Chatterji, 8th edition, page no: 83