Question

ATP hydrolysis and Myosin II steps (5)-

a) Cross-bridge formation, power stroke, ATP binding, ATP hydrolysis, myosin release
b) ATP binding, ATP hydrolysis, myosin release, cross-bridge formation, power stroke
c) Myosin release, cross-bridge formation, power stroke, ATP binding, ATP hydrolysis
d) Power stroke, ATP binding, ATP hydrolysis, myosin release, cross-bridge formation

Answer 1

The correct order of steps for ATP hydrolysis and Myosin II is Cross-bridge formation, power stroke, ATP binding, ATP hydrolysis, myosin release.

Step-by-step explanation:

The correct order of steps for ATP hydrolysis and Myosin II is option a) Cross-bridge formation, power stroke, ATP binding, ATP hydrolysis, myosin release.

The myosin head forms a cross-bridge with actin which initiates the power stroke. During the power stroke, the myosin head bends with release of ADP and inorganic phosphate. Another ATP binds to the myosin head, causing the cross-bridge to detach and returning myosin to the cocked configuration.