Question

Cell division would be most common among cells in which of the labeled layers?

Answer 1

The skin is made up of three layers- epidermis, dermis and hypodermis. The spiermis is shown in the image. Epidermis has five layers. These five layers are Stratum corneum (A), stratum lucidum, Stratum granulosum (B), Stratum spinosum (C) and Stratum basale (D). The image shown is of thin skin that lacks stratum lucidum. E shows the dermis of the skin that has the nerves and blood vessels. A depicts the Stratum corneum lacks viable cells and has all dead ketatinocytes that get sloughed off. B layer is the stratum granulosum which have keratinocytes that keep producing keratin. Layer C is stratum spinosum contains daughter cells that are formed by cell division in the stratum basale. Layer D is the stratum basale, which is made up of keratinocyte stem cells and melanocytes. These cells undergo mitosis to form daughter cells which move to the stratum spinosum.

Right choice: Layer D or D.