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11 Dec 2019

which of the following is most directly required to initiate the coupling of myosin to actin?

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Related questions

Which of the following answers describes the most directconsequence of tropomyosin binding to F-actin in muscle cells?

The (-) end of F-actin is stabilized

Loss of actin-ADP subunits from the (+) end is prevented

Myosin binding to F-actin is blocked
ATP hydrolysis by myosin is blocked

The movement of myosin towards the (+) end is blocked
Which of the following statements concerning cross bridges is incorrect
A. Cross bridges are globular heads of myosin molecules
B. Cross bridges have actin vining sites that are normally covered by troponin and tropomyosin except during excitatation- contraction coupling
C. Cross bridges bind with actin and then bend to pull the thin filaments inward during contraction according to the sliding filament mechanism
D. Mg2+ is necessary to bind ATP to the crops bridge
E. A fresh molecule of the ATP must be bound to the cross bridge to break the bond between actin and myosin

If myosin uses ATP to cock it's headgroup and generate the power stroke, where does the energy come from to bind actin and myosin together?

This is driven through the law of mass action

This interaction is spontaneous under certain myosin and actin conformations; it requires no energy

There is implicit ATP hydrolysis upon myosin binding to actin

This interaction is mediated through a bridging phosphate molecule between the two proteins

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