Energy Release and Conservation
In cellular metabolism, O2 is used

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

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Energy Release and Conservation
Which of the following is the most complete definition of fermentation?

Production of energy by substrate-level phosphorylation
Complete catabolism of glucose to CO2 and HO2
Production of ethyl alcohol from glucose
Oxidation of glucose with organic molecules serving as electron acceptors

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