Multiple choice

Actin binding sites are located on

  1. troponin

  2. tropomyosin

  3. meromyosin

  4. Both (2) and (3)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

 Each actin 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 other proteins, 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, a subunit of troponin marks the active binding sites for myosin on the actin filaments.

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