Cells use the process of fermentation when there is $\boxed{no}$ oxygen present. The purpose of fermentation is to generate NAD+ $\boxed{so}$ the process of glycolysis can continue.
Added by Roy B.
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Cells resort to fermentation when oxygen is unavailable to continue generating energy through glycolysis. Show more…
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4. What is the purpose of fermentation reactions? - to regenerate NAD+ so glycolysis can continue - to make alcohol or lactic acid that cells can metabolize for energy under anaerobic conditions - to make additional ATP when respiration can't make ATP fast enough - to slow down cellular oxygen consumption when oxygen is scarce - to make organic molecules that cells can store until oxygen becomes available
Jorge V.
Fermentation permits the continued extraction of energy from glucose in the absence of oxygen. If glucose catabolism is anaerobic, why is fermentation necessary for glycolysis to continue?
In a eukaryotic cell, when oxygen is absent, the electron transport chain can't run. The cell must rely on glycolysis for ATP generation. In this situation, pyruvate doesn't enter the mitochondrion. Instead, it enters a process called fermentation in order to regenerate. In some cells, this generates carbon dioxide and ethanol, and in others, it generates lactic acid without the carbon dioxide.
Adi S.
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