Question

Which of the following statements about the molecular arrangement of actin and myosin in myofibrils if false?

I. Each actin (thin filament) is made 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) lie in the grooves of F-actin

V. Troponin molecules (complex proteins) are distributed at regular intervals on the tropomysin

VI. Troponin forms the head of the myosin molecule

VII. The myosin is a polymerized protein

• A. I, III, VII
• B. Only VII
• C. Only VI
• D. Only III

Answer 1

Answer: (C)

Only VI