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Actin and tropomyosin are part of thin filaments of skeletal muscle. Tubulin is present in microtubules. Myosin is muscle protein.

1. Actin and tropomyosin are part of thin filaments of skeletal muscle.
2. Tubulin is present in microtubules.
3. Myosin is muscle protein.
4. All of the above.

Correct answer: All of the above.

Solution

Each option A, B, and C states a correct fact: actin and tropomyosin are components of thin filaments, tubulin makes up microtubules, and myosin is a muscle protein. Since all three are true, the option that includes all of them is correct.

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