Energy Release and Conservation
In cellular metabolism, O2 is used

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

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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?

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

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