What tough, fibrous protein is found in dead cells of the hair, nails, and outer layer of skin?
A) Pheomelanin
B) Fibrin
C) Collagen
D) Keratin

Question

Quizplus · Accepted Answer

Keratin is a tough, fibrous protein that is found in dead cells of the hair, nails, and outer layer of skin. Pheomelanin is a pigment found in hair and skin, fibrin is a protein involved in blood clotting, and collagen is a protein found in connective tissue.

What Tough, Fibrous Protein Is Found in Dead Cells of the Hair