Colorado Cosmetology Written Practice Exam

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Hair is primarily composed of which protein?

Collagen
Elastin
Keratin
Myosin

The correct answer is: Keratin

Hair is primarily composed of keratin, which is a type of fibrous protein. Keratin is a key structural material making up the outer layer of human skin, as well as hair and nails. This protein provides strength, durability, and protection to the hair, allowing it to withstand various environmental factors and styling processes. Collagen is mainly found in connective tissues, contributing to the structure and elasticity of the skin, while elastin is important for the elasticity of the skin and certain tissues but is not a component of hair. Myosin, on the other hand, is involved in muscle contraction. Therefore, the best answer to the question regarding the primary protein composition of hair is keratin.