Keratin is a
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
Globular protein
Cylindrical protein
Fibrous protein
None of the above
Structure and function of protein