Question

Select the correct answer.

What's the role of oxygen in cellular respiration?
A It accepts electrons and keeps the electron transport chain running.
B. It breaks down carbon-based sugar molecules to release energy and forms carbon dioxide.
C. It combines with hydrogen ions in sugar molecules to release energy and form water.
D. It supplies electrons to the electron transport chain to keep it running.

Answer 1

A It accepts electrons and keeps the electron transport chain running.

O2 simply functions as an electron receiver in the ETC/oxidative phosphorylation. It gobbles up the products of oxidized NADH or FADH 2.