Your hair and fingernails are made up of flattened layers of dead cells.These dead cells are tough and resistant to physical damage because they are filled with
A) microtubules that prevent bending of the cells.
B) microfilaments that are actively adding actin monomers to their plus ends.
C) collagen protein that forms tough ropes.
D) tubulin that is assembled into stiff filaments.
E) intermediate filaments made up primarily of keratin proteins.

Question

Quizplus · Accepted Answer

Hair and nails are made up of keratin, a fibrous protein that forms intermediate filaments that provide structural support and durability to the cells. Collagen does form tough ropes, but it is not found in hair and nails. Microtubules and tubulin are involved in cell division and intracellular transport, but not in the structure of hair and nails. Microfilaments and actin are involved in cell movement and shape, but not in the structure of hair and nails.

Your Hair and Fingernails Are Made Up of Flattened Layers