Question

Which is wrongly matched?

• A. Red muscle-myoglobin
• B. Tendon-connective tissue
• C. Troponin-fibrous protein
• D. Smooth muscle-involuntary muscle
• E. Myosin-contractile protein

Answer 1

The correct option is C Troponin-fibrous protein

• The myofibril is composed 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. Each ‘F’ actin is a polymer of monomeric ‘G’ (Globular) actins. 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. In the resting state tropomyosin partially covers myosin binding site on actin. Tropomyosin is a fibrous protein and Troponin is a globular protein.
• So, the correct answer is 'Troponin-fibrous protein'