NEET Biology question
Which of the following statements about the molecular arrangement of actin and myosin are correct? I. Each actin (thin filament) is made up of 2F (filamentous) actins. II. F-actin is the polymer of G (globular) actin. III. 2F actins are twisted into a helix. IV. Two strands of tropomyosin (protein) lies in the grooves of F-actin. The correct option is
Answer: (D)
Solution
Statements I, II and III correctly describe the thin filament, which is made of two F-actin strands, each a polymer of globular G-actin monomers, twisted together into a helix; statement IV is inaccurate in
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