Oxygen in aerobic respiration.
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NAD+ is the first electron acceptor in cellular respiration (O2 is the final acceptor).
ATP-synthase
Oxygen acts as the final electron acceptor in the electron transport system, accepting electrons and combining with protons to form water.
oxygen
Helium is not an electron donor or acceptor as it has a full outer electron shell (2 electrons). It is classified as a noble gas and is chemically inert, meaning it does not readily form chemical bonds.