Arkansas State Barber Practice Exam

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What is hair chiefly composed of?

Collagen
Melanin
Keratin
Elastin

The correct answer is: Keratin

Hair is chiefly composed of keratin, a type of protein that also makes up nails and the outer layer of skin. Collagen is mostly found in connective tissues, such as tendons and ligaments. Melanin is the pigment that gives hair its color, but it is not the chief component. Elastin is a protein found in tissues that require elasticity, such as blood vessels, but it is not a major component of hair. Therefore, option C, keratin, is the most accurate answer.