Question

Component of actin filament of a sarcomere is

• A. Myosin and troponin
• B. Troponin and actin
• C. Actin and myosin
• D. Actin, troponin and tropomyosin

Answer 1

The correct option is D Actin, troponin and tropomyosin

• Skeletal muscle fiber is made up of two types of filaments. They are thick filament(myosin) and thin filament(actin).
  
• Each actin (thin) filament is made of two ‘F’ (filamentous) actins helically wound to each other. Two filaments of another protein, tropomyosin also run close to the ‘F’ actins throughout its length. A complex protein Troponin is distributed at regular intervals on the tropomyosin.
  
• Hence Component of actin filament of a sarcomere is Actin, troponin, and tropomyosin.
• So, the correct answer is 'Actin, troponin, and tropomyosin'.