Which are the key proteins in the contractile units of the muscle cells?
1. Actin and myosin
2. Myosin and tubulin
3. Tubulin and actin
4. None of the above
ANS: 1
Feedback
1
Actin and myosin are the key proteins in the contractile unit of the muscle cells.
2
Myosin and tubulin are not the key elements in the contractile units of the muscle cells because tubulin is associated with microtubules formation.
3
Tubulin and actin are not the key proteins in the contractile units of the muscle cells. Microtubules are hollow filaments composed of tubulin. So tubulin is associated with microtubules formation.
4
The answer option none of the above is incorrect. Actin and myosin are the key proteins in the contractile unit of the muscle cells.
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