Question

part e (5 of 7)
how does the myosin head obtain the energy required for activation?
the energy comes from the hydrolysis of atp.
the energy comes from oxidative phosphorylation.
the energy comes from the hydrolysis of gtp.
the energy comes from the direct phosphorylation of adp by creatine phosphate.

Explanation:

Myosin is a motor - protein involved in muscle contraction. The energy for myosin head activation comes from the hydrolysis of ATP. ATP (adenosine triphosphate) is the cell's main energy - currency. When it is hydrolyzed into ADP (adenosine diphosphate) and inorganic phosphate, energy is released which is used by the myosin head for its activation and subsequent movement during muscle contraction. Oxidative phosphorylation is a process for generating ATP, not the direct energy source for myosin head activation. Hydrolysis of GTP is not the energy source for myosin head activation. The direct phosphorylation of ADP by creatine phosphate is a process to quickly regenerate ATP, not the direct energy source for myosin head activation.

Answer:

The energy comes from the hydrolysis of ATP.