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9.3 Fermentation Life without oxygen? • Cellular respiration only happens when oxygen is present • What happens if oxygen isn’t available? I. Fermentation • Glycolysis quickly produces ATP without oxygen • If too much ATP is made, no more NAD+ are available – Eventually, no more ATP can be made • Electron chain only runs if oxygen is present I. Fermentation • There is a pathway that can make ATP without oxygen • Fermentation: the process of glycolysis and the anaerobic pathway combined • Without oxygen, fermentation releases energy from food molecules by producing ATP I. Fermentation • NADH becomes NAD+ by giving electrons to pyruvic acid • NAD+ can then be used for glycolysis again • Fermentation occurs in the:????? A. Alcoholic Fermentation • Yeasts and other microorganisms use alcoholic fermentation • Used to make bread and alcoholic beverages • Formula: Pyruvic acid + NADH Alcohol + CO2 + NAD+ B. Lactic Acid Fermentation • Most organisms & you, carry out lactic acid fermentation • Used in your muscles • Give products like sour cream and yogurt their sour taste • Formula: Pyruvic acid + NADH Lactic acid+ NAD+ What does it look like?