Energy Release and Conservation
In cellular metabolism, O2 is used

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

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Energy Release and Conservation
Which of the following best explains about the usefulness of the production of ethanol in yeast cells under anaerobic conditions?

The process regenerates NAD+, which is required for glycolysis
Yeast would be unable to activate the enzymes of the Krebs cycle without ethanol
Ethanol keeps the electron transport system functioning
The process generates oxygen, which is required for glycolysis

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