Energy Release and Conservation
In cellular metabolism, O2 is used

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

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

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

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