Energy Release and Conservation
In cellular metabolism, O2 is used

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

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

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

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