Electron flow in the mitochondria follows this pathway:
A) Complex I → complex II → complex III → complex IV.
B) Complex IV → complex III → complex II → complex I.
C) Complex I → complex III → complex IV.
D) Complex II → complex III → complex IV.
E) Both complex I → III → IV and complex II → III → IV.

Question

Quizplus · Accepted Answer

Electron flow in the mitochondria can start from either Complex I or Complex II, but both pathways converge at Complex III, then proceed to Complex IV. This is because electrons from NADH enter the electron transport chain at Complex I, while electrons from FADH2 enter at Complex II. Both pathways then converge and continue through Complexes III and IV.

Electron Flow in the Mitochondria Follows This Pathway