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Unformatted text preview: l Does not require oxygen Breaks 1 glucose into 2 pyruvate Yields two molecules of ATP per molecule of glucose Yields two molecules of NADH per molecule of glucose 32 Overview of Glucose Overview of Glucose Breakdown If oxygen is absent fermentation occurs Pyruvate is converted into either lactate, or into ethanol and CO2 If oxygen is present cellular respiration occurs Pyruvate is converted into acetyl­coenzyme A which enters the Krebs Cycle 33 Fermentation Fermentation Anaerobic Pyruvate is converted into lactate or ethanol Does not produce more ATP Is necessary to regenerate the high­energy electron carrier molecule NAD+, which must be available for glycolysis to continue 34 Overview of Glucose Overview of Glucose Breakdown Cellular respiration Occurs in mitochondria (in eukaryotes) Requires oxygen Breaks down pyruvate into carbon dioxide and wate...
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