Question

Thick filaments in muscles are polymerised proteins of

• A. Meromyosin
• B. Actin
• C. Troponin
• D. Tropomyosin
• E. Keratin

Answer 1

Answer: (A)

Meromyosin

• Myofibrils are composed of two types of filaments i.e thin filament (actin) and thick filament (myosin).
  
• Actin filaments are thinner as compared to the myosin filaments, hence are commonly called thin and thick filaments respectively
  
• Each myosin (thick) filament is a polymerized protein. Many monomeric proteins called meromyosins constitute one thick filament (Myosin).
  
• Hence thick filaments in muscles are polymerized proteins of meromyosin.
• So, the correct answer is 'Meromyosin'.