A microtubule has a diameter of

100

o A

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150

o A

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250

o A

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None of the above

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Solution

The correct option is B 250 $o A$
A microtubule is a tubular linear polymer of tubulin protein which is a part of the cytoskeleton that helps to provide structure and shape to the cytoplasm of a eukaryotic cell.
Protofilaments (tubulin dimers) undergo polymerization to form the microtubules and it generally consists of 13 linear protofilaments which are wound together to form a hollow cylinder of 25nm or 250 angstroms.
So, the correct answer is '250 Angstroms'.

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