Microfilaments are composed mainly of a protein called

Actin

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Tubulin

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Myosin

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Chitin

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Solution

The correct option is D Actin
Microfilaments are ultra microscopic, long, thin, cylindrical rods or protein filaments of about 6 nm diameter. They are composed of mainly globular protein actin, and have contractile association with filamentous protein, myosin which is essential for contraction of microfilaments.
Therefore, the correct answer is option A.

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