Which of the following choices most accurately represents the sequence of steps occurring in the contraction cycle? The events numbered 1 through 6 may be used more than once.
1) Mysoin binds ATP
2) Mysoin hydrolyzes ATP and goes into cocked position
3) Myosin releases ADP and inorganic phosphate
4) Myosin binds actin filament
5) Power stroke
6) Myosin releases actin filament

Question

Quizplus · Accepted Answer

The correct sequence for the muscle contraction cycle is: Myosin binds ATP (1), causing it to release actin (6). ATP is then hydrolyzed, moving myosin to a cocked position (2). Myosin binds to actin (4), releases ADP and inorganic phosphate (3), leading to the power stroke (5), and the cycle can begin again with myosin binding another ATP (1), followed by the release of actin (6). This sequence accurately reflects the steps of the cross-bridge cycle in muscle contraction.

Which of the Following Choices Most Accurately Represents the Sequence