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
Which of the following is the most complete definition of fermentation?

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

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