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

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Energy Release and Conservation
Organisms can synthesize ATP by oxidative phosphorylation when they

oxidize glucose to pyruvate
pass electrons to oxygen through an electron transport system containing cytochromes
ferment
pass electrons from the oxidation of chlorophyll through an electron transport system

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