Hollow cylindrical structures composed of tubulin protein are:

Statement $X$ : The cytoskeleton is composed of three types of filaments: microfilaments,microtubules,and intermediate filaments.
Statement $Y$ : Microtubules are hollow tubes made of globular protein tubulin.

Microtubules are associated with ............ .

What does the following figure represent?

The hollow filament of the flagellum is composed of which protein?

The filament of the flagellum is composed of which protein?