Questions: Question 3 Which are the key proteins in the contractile units of the muscle cells? Myosin and prohormone Prohormone and tubulin Actin and myosin Tubulin and actin

Question 3 Which are the key proteins in the contractile units of the muscle cells? Myosin and prohormone Prohormone and tubulin Actin and myosin Tubulin and actin
Transcript text: Question 3 Which are the key proteins in the contractile units of the muscle cells? Myosin and prohormone Prohormone and tubulin Actin and myosin Tubulin and actin
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Solution

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The answer is the third one (or C): Actin and myosin.

Explanation for each option:

  1. Myosin and prohormone: This option is incorrect because prohormones are precursors to hormones and are not involved in muscle contraction. Myosin is indeed a key protein in muscle contraction, but prohormone is not.

  2. Prohormone and tubulin: This option is incorrect because, as mentioned, prohormones are not involved in muscle contraction. Tubulin is a protein that makes up microtubules, which are part of the cell's cytoskeleton, not the contractile units of muscle cells.

  3. Actin and myosin: This option is correct. Actin and myosin are the primary proteins that interact to cause muscle contraction. Myosin heads bind to actin filaments and, through a series of conformational changes powered by ATP hydrolysis, slide the actin filaments past the myosin, resulting in muscle contraction.

  4. Tubulin and actin: This option is incorrect because, while actin is a key protein in muscle contraction, tubulin is not. Tubulin is involved in forming microtubules, which are not part of the contractile machinery of muscle cells.

Summary: The key proteins in the contractile units of muscle cells are actin and myosin.

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