Amyosin molecule in the thick filaments can be considered a protein having a quaternary structural level. which of the following best describes this structural level?
1. myosin has an atp binding site, actin binding site and flexible hinge region.
2. myosin is involved in the power stroke of muscle contraction.
3. myosin molecules consist of two heavy and two light polypeptide chains.
4. myosin is a primary component within a myofibril.
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