Question

The strands of microtubules are made up of _________________ sub-units.

Answer 1

Correct answer-

The strands of microtubules are made up of protein subunits.

Explanation -

1. Microtubule is a long unbranched hollow structure.
2. The wall of the microtubules consists of 11-13 longitudinal strands.
3. Each strand is made up of a protein subunit, the component of which is tubulin.