<prompt> Keratin is aGlobular proteinCylindrical proteinFibrous proteinNone of the above  <response>: 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 