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Fermentation after glycolis

What is the purpose of ferementation after glycolysis? and..
Why use starved starved yeast rather than sugar fed yeasts for fermentation?

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The purpose of fermentation is to produce, at least some ATP, in conditions where there isn't enough oxygen for aerobic respiration. When glucose is oxidized to pyruvate (glycolysis), and then all the way to carbon dioxide in the Krebs cycle, an enormous amount of free energy is given off. Most of this free energy is captured by reduced cofactors, NADH and FADH2. In the presence of oxygen, these cofactors are re-oxidized back to ...