NEETZoologyLocomotion and Movement
Identify A, B and C and then choose the correct statement:
Options
- AA= Tropomyosin: is distributed at regular intervals on troponin.
- BB= Troponin: runs close to F-actin throughout its length.
- CC= F-actin: polymer of globular actin.
- DC= G-actin: polymer of F-actin.
Correct answer
C. C= F-actin: polymer of globular actin.
Step-by-step solution
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 a subunit of troponin masks the active binding sites for myosin on the actin filaments.