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What is the function of tropomyosin in the actin filament?

Options

  1. ATo activate the binding sites for myosin on actin filaments
  2. BTo mask the active binding sites for myosin on actin filaments
  3. CTo run close to the "F" actins throughout its length
  4. DTo regulate the interaction between "F" actins and troponin

Correct answer

C. To run close to the "F" actins throughout its length

Step-by-step solution

The striated appearance of myofibrils is due to the distribution pattern of two important proteins - Actin and Myosin. The light bands contain actin and the dark bands contain myosin.The light bands in a myofibril contain actin and is called I-band or Isotropic bandThe actin filaments are thinner as compared to the myosin filaments 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) actinsTwo filaments of another pr

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