Question

3) Which of the following statements about the myosin cross bridge cycle is false?

I. The binding of ATP to myosin reduces myosin's affinity for actin.

II. In the basal state (as in rigor mortis), there is no ATP and so the myosin cannot bind to actin to generate the next stroke.

III. The cocking of myosin head requires the hydrolysis of the bound ATP.

A) I

B) II

C) III

D) I, II

E) II, III

Answer 1

B) II

During rigor mortis, in the absence of ATP, the myosin remains bound to actin and the muscle remains in the contracted state.