From what electron donor may the second electron that enters the microsomal cytochrome P450 cycle come?

Name: From what electron donor may the second electron that enters the microsomal cytochrome P450 cycle come?
Brand: Quizplus
Rating: 5.0 (43 reviews)

Question

Quizplus · Accepted Answer

Cytochrome b5 can serve as an electron donor in the microsomal cytochrome P450 cycle, providing the second electron necessary for the enzymatic activity of cytochrome P450 enzymes. This process is important for the metabolism of various substances, including drugs and toxins.

From What Electron Donor May the Second Electron That Enters