Question

In the electron transport chain during terminal oxidation, the cytochrome, which donates electrons to $O_2$ is

Answer 1

Electron transport chain (ETC)

Electron transport chain (ETC) is in the inner mitochondrial membrane and it has four complexes that accept and carry electrons released from NADH + H${}^{+}$ and FADH${}_2$.

The correct sequence of electron acceptors in the electron transport chain is cytochrome (b, c, a, a${}_3$). Hence, cytochrome a${}_3$ donates electrons to $O_2$ in the electron transport chain during terminal oxidation.

Final Answer

(c) Cyto-a${}_3$