Colorado Cosmetology Written Practice Exam

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What is the structural material that composes the natural nail?

Collagen
Elastin
Keratin
Protein

The correct answer is: Keratin

Natural nails are composed mainly of keratin, a fibrous structural protein that also makes up hair and the outer layer of skin. Collagen and elastin are also proteins, but they do not make up the composition of nails. Protein is a broad term and while keratin is a type of protein, it is the specific structural material that makes up natural nails.