Which of the following is the contractile protein of a muscle?

Myosin

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Tropomyosin

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Actin

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Tubulin

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Solution

The correct option is A Myosin
Myosin is a contractile protein of muscle. Primary myofilaments are made up of this protein.
Secondary myofilaments are composed of a protein actin, having with it two regulatory proteins: tropomyosin and troponin.
Tubulin is a protein of which the microtubules of cells are formed.

So, the correct answer is myosin.

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