A myosin molecule in the thick filaments can be considered a protein having a quaternary structural level. Which of the following best describes this structural level?
A) Myosin molecules consist of two heavy and to light polypeptide chains.
B) Myosin has an ATP binding site, actin binding site and flexible hinge region.
C) Myosin is a primary component within a myofibril.
D) Myosin is involved in the power stroke of muscle contraction.
A
Anatomy & Physiology
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