A) Actin, troponin and tropomyosin
B) Actin, troponin
C) Myosin, troponin
D) Actin, tropomyosin
Correct Answer: A
Solution :
One thin filament probably contains 300-400 actin molecules about 50 tropomyosin and 50 troponin. It is said that tropomyosin plays a vital role in sensitizing the contractile proteins (actin and myosin) to calcium ions.
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