Question

The contractile protein of skeletal muscle involving ATPase activity is-

• A. Troponin
• B. Tropomyosin
• C. Myosin
• D. $\alpha$- Actin

Answer 1

Answer: (C)

Myosin

Answer 2

Myosin is a contractile protein that interacts with actin to bring about contraction of muscle or cell movement. The type of myosin molecule found in muscle fibres consists of a tail, by which it aggregates with other myosin molecules to form so-called thick filaments and a globular head, which has sites for the attachment of actin and ATP molecule. Troponin, tropomyosin and a-actinin are the actin in the thin filament.