Energy Release and Conservation
In cellular metabolism, O2 is used

as a terminal electron acceptor
to provide electrons for photophosphorylation
in glycolysis
in the Krebs cycle

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Energy Release and Conservation
Organisms can synthesize ATP by oxidative phosphorylation when they

oxidize glucose to pyruvate
ferment
pass electrons from the oxidation of chlorophyll through an electron transport system
pass electrons to oxygen through an electron transport system containing cytochromes

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