Microtubules (Short Note)

Majority of eukaryotic cells contain unbranched hollow, cylindrical organelles called microtubules. They are very fine tubules made up of globular sub units of protein called tubulin. They may extend for several micrometers in length. At intervals cross bridges or arms sometimes project from their walls linked with other microtubules. They help in movement of organelles such as secretary vesicles. They are involved in the movement of chromosomes during division of the cell nucleus. Microtubules are involved in the over all shape changes that cells undergo during period of specialization.