Final answer:
Microtubules are part of the cytoskeleton in cells, providing structural support and performing various cellular functions.
Step-by-step explanation:
The statement is true. Microtubules are part of the cytoskeleton, which is a network of filaments and tubules in the cytoplasm that provides structural support for the cell and aids in various cellular processes. Microtubules are composed of polymerized tubulin dimers and are involved in organelle movement and cell division, among other functions.