Question

What's the role of oxygen in cellular respiration?

ОА.
It accepts electrons and keeps the electron transport chain running.
OB.
It breaks down carbon-based sugar molecules to release energy and forms carbon dioxide.
O c.
It combines with hydrogen ions in sugar molecules to release energy and form water.
It supplies electrons to the electron transport chain to keep it running.
OD

Answer 1

The correct answer is A. The oxygen molecule accepts electrons from a compound called cytochrome a3. Cytochromes contain a central Iron atom that can either be in the oxidised state(ferric state) Fe3+ or reduced state(ferris state) Fe2+. The cytochrome is oxidized by giving the electron to O2(O2 is reduced).O2 becomes 2O- that quickly react with H+ to form H2O.