Colorado Cosmetology Written Practice Exam

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Which protein gives skin its ability to stretch and return to shape?

  1. Collagen

  2. Elastin

  3. Keratin

  4. Melanin

The correct answer is: Elastin

Elastin is a protein found in connective tissue that gives skin its ability to stretch and return to its original shape. Collagen, choice A, is also a protein found in the skin but provides strength and structure rather than elasticity. Keratin, choice C, is a protein that makes up hair and nails and does not contribute to the skin's ability to stretch. Melanin, choice D, is a pigment that gives color to the skin and does not play a role in its elasticity. Therefore, the correct answer is B Elastin.

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