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21 June, 00:03

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

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  1. 21 June, 01:47
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    head-to-tail association of tubulin dimers.

    Explanation:

    Microtubules are made up of a single type of globular protein, called tubulin. Tubulin is made up of two 55 kD polypeptides, α-tubulin and β-tubulin. Tubulin dimers are polymerized into microtubules, consisting of 13 linear protofilaments coupled around a hollow core. These protofilaments are composed of head-to-tail matrices of tubulin dimers, which are arranged in parallel.
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