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Mitotic spindle is mainly composed of which protein?

1. Actin
2. Myosin
3. Tubulin
4. Myoglobin

Correct answer: Tubulin

Solution

The mitotic spindle is made of microtubules, and microtubules are polymers of tubulin. Actin and myosin are mainly involved in muscle contraction and cell movement, while myoglobin stores oxygen in muscle.

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