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Fermentation is a process that typically occurs in yeast cells, muscle cells, and some bacteria in the absence of oxygen.
By David Carmack (Own work) [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons
What is the main function of fermentation?
Regenerate NAD$^+$ so that glycolysis can continue.
Produce a large amount of ATP to fuel chemical reactions.
Convert glucose to carbon dioxide and water.
Produce the electron carriers NADH and FADH$_2$.