Which of the Following Components is a 2-Electron Donor

Question

Which of the following components is a 2-electron donor?
A)FAD
B)Fe-S
C)NADH
D)cyt c

Accepted Answer

NADH is a 2-electron donor, as it carries two electrons and a proton (H+) during redox reactions. FAD, Fe-S, and cyt c are all one-electron donors.