Question

ATPase of the muscle is located in

• A. Actinin
• B. Myosin
• C. Troponin
• D. Actin

Answer 1

The correct option is B Myosin

Actinin:

• Actinin are actin cross-linking proteins.

Troponin:

• Troponin is composed of three polypeptides: TpT-binds to tropomyosin. TpI inhibits the interaction between actin and myosin. TpC-Calcium-binding subunit. It covers the myosin-binding site on actin.

Myosin:

• Myosin is a globular protein.
• It is composed of subunits called meromyosin.
• Each meromyosin has a head and a tail.
• The head has ATPase activity apart from the actin-binding site and ATP-binding site.

Actin:

• Actin are globular proteins.
• The monomeric G actin polymerises to form F actin in the presence of magnesium ions.

Final answer: Myosin

Summary:
As the myosin head has ATPase activity so the correct option is c