Energy Release and Conservation
In cellular metabolism, O2 is used

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

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

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

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