MICROANATOMY

Detailed explanation-1: -Microtubules are polymers of tubulin that form part of the cytoskeleton and provide structure and shape to eukaryotic cells.

Detailed explanation-2: -18.4: Microtubules are Dynamic Structures Composed of Tubulin Monomers. Microtubules assemble from dimers of −tubulin and −tubulin monomers. After their formation, /−tubulin dimers add to a growing, or plus end (+end), fueled by GTP hydrolysis (see Figure 18.2).

Detailed explanation-3: -In contrast to intermediate filaments, which are composed of a variety of different fibrous proteins, microtubules are composed of a single type of globular protein, called tubulin. Tubulin is a dimer consisting of two closely related 55-kd polypeptides, -tubulin and -tubulin.