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Chapter 9.3 Fermentation Generating energy when oxygen is not available: Glycolysis produces ATP quickly and without oxygen (is anaerobic). Occurs in the cytoplasm When oxygen is not present glycolysis is followed by a pathway that produces ATP without oxygen. Glycolysis + this anaerobic pathway = Fermentation or Anaerobic Respiration Two forms of fermentation: alcoholic and lactic acid Alcoholic fermentation: yeasts, microorganisms ethyl alcohol (ethanol) and carbon dioxide produced pyruvic acid + NADH alcohol + CO2 + NAD+ produces alcoholic beverages, causes bread dough to rise Lactic Acid fermentation: Pyruvic acid converts to lactic acid No carbon dioxide given off Bacteria go through lactic acid fermentation so they are used in the production of yogurt, cheese, sour cream, pickles, sauerkraut Humans go through lactic acid fermentation, too. o Muscle cells are best adapted to undergoing this process.