What is the role of microtubules in the cell?

Microtubules play a crucial role in maintaining the shape and structure of cells, acting like scaffolding that supports the cellular architecture. They are part of the cytoskeleton, which provides not only structural support but also helps organize the cell's components. Additionally, microtubules are essential during cell division, forming structures called spindle fibers that help separate chromosomes and ensure that each daughter cell receives the correct complement of genetic material.

This dual function underscores the importance of microtubules in both sustaining cell integrity and enabling the proper distribution of genetic material during the cell cycle, which is vital for cell growth and reproduction. Other functions mentioned in the other options, such as storing nutrients, synthesizing proteins, and facilitating cell signaling, are performed by different cellular components and do not directly involve microtubules.