If Myosin Head Groups Were Unable to Hydrolyze ATP Due

question 3

Multiple Choice

If myosin head groups were unable to hydrolyze ATP due to an alteration in the protein structure but could still bind and release ADP and inorganic phosphate (P_i) , which step in the actin-myosin cycle would NOT take place?

• A) dissociation of the myosin head group from the actin filament
• B) repositioning of the myosin head group on the actin filament
• C) attachment of the myosin head group to the actin filament
• D) the "power stroke" conformational change in the myosin head group
• E) the conformational change in the myosin head group in the presence of Ca²⁺

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