The cytoskeleton of a cell is primarily comprised of which macromolecule?

The cytoskeleton of a cell is primarily composed of proteins, which form a dynamic network of fibers that provides structural support and shape to the cell. These protein filaments include microtubules, microfilaments, and intermediate filaments. Each type serves distinct functions, such as facilitating intracellular transport, maintaining cell shape, and enabling cellular movement.

Microtubules, for example, are crucial for cell division and are involved in the movement of organelles within the cell. Microfilaments play a role in muscle contraction and the maintenance of the cell's internal structure, while intermediate filaments provide tensile strength to resist deformation. The diverse roles of these protein components underscore their importance in maintaining the overall integrity and functionality of the cell.