What are microfilaments and microtubules and what do they do?
microfilaments contain an actin-type protein which allows them to be contractile.
Microtubules are composed of tubulin of which there are two types alpha and beta tubulin. The microtubules play key structural roles in the mitotic spindle, cilia and flagella, the latter two are involved in movement. Also vesicles within the cell can move on the microtubules.