Question

microtubules are the ______ of the cytoskeletal structures and are most commonly made of filaments that are polymers of alpha and beta tubulin.
a thinnest
b thickest
c smallest
d none of the above

Explanation:

Microtubules are the thickest of the cytoskeletal structures. They are composed of filaments made of alpha - and beta - tubulin polymers. The other components of the cytoskeleton, like microfilaments and intermediate filaments, are thinner.

Answer:

B. Thickest