A Microtubule Protofilament is Formed by The

Question

A microtubule protofilament is formed by the:
A)lateral association of only γ-tubulin subunits.
B)head-to-tail association of only γ-tubulin subunits.
C)lateral association of tubulin dimers.
D)head-to-tail association of tubulin dimers.

Accepted Answer

A microtubule protofilament is formed by the head-to-tail association of tubulin dimers. Each tubulin dimer consists of one α-tubulin subunit and one β-tubulin subunit. The head of one α/β dimer associates with the tail of the next α/β dimer to form the protofilament.