Which Statement About Myosin is True

Question

Which statement about myosin is true?
A) A thick filament consists of actin and myosin.
B) Myosin filaments consist of linear troponin molecules attached to tropomyosin heads.
C) Troponin binds to the head of the myosin molecule.
D) Myosin activity is regulated by tropomyosin,which binds to myosin tails.
E) Myosin heads have ATPase activity and interact with actin.

Accepted Answer

Myosin heads have ATPase activity and interact with actin. Option A is incorrect because thick filaments consist of myosin alone, not actin and myosin together. Option B is incorrect because troponin molecules are part of the thin filament, not the thick filament (myosin). Option C is incorrect because troponin primarily interacts with the thin filament, not the thick filament (myosin). Option D is incorrect because tropomyosin primarily interacts with the thin filament, not the thick filament (myosin).