Question

Which step of cross-bridge cycling is considered the power stroke?
a. when the myosin cross-bridge forms
b. when ATP binds to the myosin head and releases it from the thin filament
c. when the phosphate is released and the myosin cross-bridge moves to the right in the animation
d. when ATP is hydrolyzed and the myosin head moves to the left in the animation

Answer 1

Answer:

c. when the phosphate is released and the myosin cross-bridge moves to the right in the animation.

Explanation:

Power stroke refers to the step whereby ADP and phosphate are released from the myosin, allowing the mysoin head to bend.