The Duty Ratio for a Motor Protein Is Defined as the Fraction

Multiple Choice

The duty ratio for a motor protein is defined as the fraction of time in each cycle of activity of the motor in which the head is bound with high affinity to its cytoskeletal track. Which of the following is reasonable given this definition?

A) Myosin V has a higher duty ratio than myosin II, because Pᵢ release is the rate-limiting step in its cycle.
B) Myosin II has a higher duty ratio than myosin V, because Pᵢ release is the rate-limiting step in its cycle.
C) Myosin V has a higher duty ratio than myosin II, because ADP release is the rate-limiting step in its cycle.
D) Myosin II has a higher duty ratio than myosin V, because ADP release is the rate-limiting step in its cycle.