AP BIOLOGY

Detailed explanation-1: -The growth of the nail takes place by the division of these living cells. The stages of mitosis can be observed in these living cell cuticles and can be used to study mitosis. So, Option C: nail base is the correct answer.

Detailed explanation-2: -Keratinocytes (ker-uh-TIH-no-sites) make keratin, a type of protein that’s a basic component of hair, skin, and nails. Keratin in the skin’s outer layer helps create a protective barrier.

Detailed explanation-3: -Keratinocytes produce keratin, a tough, protective protein that makes up the majority of the structure of the skin, hair, and nails.

Detailed explanation-4: -The matrix cells are found in the nail root at the base of the nail in which the mitosis occurs and the production of cells within the nail matrix results in the growth of the nail.