Your Hair and Fingernails Are Made Up of Flattened Layers

Multiple Choice

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.