What do alcohol fermentation, acetyl CoA formation, and the Krebs cycle have in common?

Each process releases carbon dioxide. Alcohol fermentation produces CO₂ as pyruvate is converted into acetaldehyde, acetyl CoA formation releases CO₂ when pyruvate is broken down, and the Krebs cycle releases CO₂ as carbon atoms are removed from its intermediates. So the shared feature is that all produce carbon dioxide.

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