Which of the Following Statements Regarding Myosin in Skeletal Muscle

question 49

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.