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colleen colleen
wrote...
Valued Member
Posts: 17077
11 years ago
Explain why fermentation is a necessary alternative to respiration in many cells.
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Valued Member
11 years ago
Respiration is possible only when electron transport can occur, and electron transport occurs only in the presence of a final electron acceptor such as oxygen. When the final electron acceptor is absent, the flow of electrons stops, resulting in the loss of ATP production through chemiosmosis. Unfortunately, without an electron transport chain, the cell also has no way of regenerating NAD+ to keep processes such as glycolysis going. Fermentation is a way to regenerate NAD+ in the absence of electron transport, thereby allowing the cell to continue ATP production via glycolysis, albeit at a lower level (2 ATP per molecule of glucose from glycolysis instead of 38 ATP molecules from chemiosmosis).
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