Mitotic spindle is mainly composed of which protein:

Actin

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Tubulin

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Actomyosin

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Myoglobin

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Solution

The correct option is B Tubulin
Mitotic spindles are made of microtubules. Microtubules are made of radially arranged protofilaments, which are made of tubulin dimers.

Actin and myosin are the contractile proteins of muscle fibres.
Myoglobin is the oxygen carrying pigment found in muscles.

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