During cellular respiration, which process releases carbon dioxide?

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Multiple Choice

During cellular respiration, which process releases carbon dioxide?

Explanation:
Carbon dioxide is released during decarboxylation steps when carbon atoms are oxidized in cellular respiration. The Krebs cycle is the stage where this happens most prominently: as acetyl-CoA is processed through the cycle, isocitrate is converted to α‑ketoglutarate and then to succinyl‑CoA, with CO2 released in each of those steps. Each acetyl-CoA that enters the cycle yields two CO2, so overall CO2 production is a hallmark of the Krebs cycle. Glycolysis does not release CO2, the electron transport chain produces water and uses oxygen, and fermentation is not part of cellular respiration.

Carbon dioxide is released during decarboxylation steps when carbon atoms are oxidized in cellular respiration. The Krebs cycle is the stage where this happens most prominently: as acetyl-CoA is processed through the cycle, isocitrate is converted to α‑ketoglutarate and then to succinyl‑CoA, with CO2 released in each of those steps. Each acetyl-CoA that enters the cycle yields two CO2, so overall CO2 production is a hallmark of the Krebs cycle. Glycolysis does not release CO2, the electron transport chain produces water and uses oxygen, and fermentation is not part of cellular respiration.

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