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Microtubules (the cytosketon) are hollow tubes of variable length and about 25nm diameter. They are stiff but flexible. Microtubules are assembled in a line from building blocks of tubulin molecules grouped into pairs called a dimer. Dimers are joined end-to-end by the process of polymerization to form a linear polymer called a protofilament. Thirteen protofilaments lying in parallel are formed into a circular tube with the duct running down the middle. This is a microtubule.

The cytoskeleton also enable cilia, flagella and sperm to move. Throughout the life of the cell various molecules and cargo containing vesicles are transported around the cell by motor proteins by moving along the protein filaments using them as highways.

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10y ago

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