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

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

Correct answer: Myosin

Solution

Myosin is the main motor protein responsible for contraction in muscle; it uses ATP to pull actin filaments and generate force. Tropomyosin is regulatory, actin is a filament partner, and tubulin is a microtubule protein.

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