Final answer:
Microtubules are hollow cylinders that shape and support the cell, while microfilaments provide support and shape just beneath the cell membrane.
Step-by-step explanation:
Microtubules are hollow cylinders that shape and support the cell. They are the thickest of the cytoskeleton structures and are made up of filaments of alpha and beta-tubulin. Microtubules help the cell keep its shape, hold organelles in place, allow them to move around the cell, and form the mitotic spindle during cell division. On the other hand, microfilaments are made of two thin actin chains twisted around each other and are mostly concentrated just beneath the cell membrane, providing support and shape to the cell.