Microtubules of spindle fibers are composed of a protein called:
Correct answer: A. Tubulin
- A. Tubulin
- B. Actin
- C. Myosin
- D. Troponin
Explanation
The correct answer is Tubulin. Tubulin is the building block of microtubules, which are crucial for forming spindle fibers during cell division. In contrast, Actin and Troponin are associated with microfilaments, not microtubules. Myosin is a motor protein that works with actin, also unrelated to microtubule formation.
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