The diameter of a microtubule fibre is:

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(B) Microtubules are hollow,cylindrical structures composed of polymerized $\alpha$-tubulin and $\beta$-tubulin dimers.These structures are essential

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$21-25$ $nm$

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(B) Microtubules are hollow,cylindrical structures composed of polymerized $\alpha$-tubulin and $\beta$-tubulin dimers.These structures are essential components of the cytoskeleton.The outer diameter of a typical microtubule is approximately $25$ $nm$,while the inner diameter is about $15$ $nm$.Therefore,the range of $21-25$ $nm$ is the standard accepted value for the diameter of a microtubule fibre.

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