Question

which of the following cytoskeleton components are long, hollow protein tubes?
actin filaments
intermediate filaments
microtubules

Explanation:

Microtubules are long, hollow protein - tubes that are part of the cytoskeleton. Actin filaments are thin and solid, and intermediate filaments are of intermediate size and have a more diverse composition and structure compared to microtubules.

Answer:

C. Microtubules