Cell Respiration - 5Following glycolysis, the presence of absence of oxygen, and/or the organism'sability to use oxygen in respiration, determines whether pyruvate will be oxidized toyield more energy in aerobic respiration or reduced to a stable molecule in thefermentations. We will discuss first what happens after Glycolysis when nooxygen is available – The Fermentations. Then we will discuss the processesinvolved in Aerobic Cellular RespirationThe Fermentations – Cell Respiration in the Absence of OxygenThe overwhelming majority of living organisms must do aerobic cellular respirationto stay alive. Fermentations and other anaerobic pathways provide insufficientATP to sustain life for most organisms. Yet, when no oxygen is available foraerobic cell respiration, eukaryotic organisms, and some prokaryotes, will completeglucose metabolism with the fermentation reactions. Fermentations are analternative pathway for pyruvate after glycolysis occurs.
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