Fermentation
= Fermentation
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In its biochemical sense, <fermentation> is <metabolism> that obtains <ATP> from breakdown of organic <substrates> without a respiratory electron transport chain. The alcoholic route is one example; not every <fermentation> produces <ethanol>. See https://openstax.org/books/biology-2e/pages/7-5-metabolism-without-oxygen[Clark, Douglas and Choi, Biology 2e, 7.5: fermentation versus anaerobic respiration].