Which of the following cytoskeletal fibers is the largest in diameter?

A) microtubules

B) actin filaments/microfilaments

C) intermediate filaments

D) nuclear lamins

E) keratin filaments

A) microtubules

Explanation:

The diameter of the cytoskeletal fibers are as follows -

Microtubules about 25 nano meters actin filaments/micro filaments is about 7 nano meters intermediate filaments about 8 to 10 nano meters

Hence,

From the above data, Microtubules have the largest diameter, it is made up of tubulin proteins which are arrange in the form of a straw - like tube which is hollow from inside, and each of the tubuline protein consists of two sub units i. e. alpha - tubuline and the beta - tubuline.