Which of the Following Statements Regarding Myosin in Skeletal Muscle

question 76

Multiple Choice

Which of the following statements regarding myosin in skeletal muscle is TRUE?

• A) Myosin cross-bridge heads contain two binding sites, one for actin and one for tropomyosin.
• B) Myosin is an ATPase.
• C) The rate of ATP hydrolysis by myosin is the same in all types of skeletal muscle.
• D) All of the myosin cross-bridge heads in a thick filament are oriented and rotate in the same direction.
• E) Troponin covers the binding site on myosin molecules until Ca²⁺ binds to troponin to remove it from its blocking position.

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