The process that produces CO2 by yeast from sugar under anaerobic conditions is

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Multiple Choice

The process that produces CO2 by yeast from sugar under anaerobic conditions is

Explanation:
When yeast operates without oxygen, it relies on fermentation to get energy from sugar. This pathway lets glycolysis continue by regenerating NAD+, which is needed for glycolysis to keep producing ATP. In alcoholic fermentation, pyruvate from glycolysis is first decarboxylated to release carbon dioxide and form acetaldehyde. The acetaldehyde is then reduced by NADH to ethanol, and in the process NAD+ is restored. The CO2 that bubbles off comes specifically from that decarboxylation step. So the production of CO2 under anaerobic conditions in yeast is a hallmark of fermentation, not aerobic respiration or photosynthesis. Anaerobic respiration would require a different final electron acceptor and is not the pathway yeast uses in this context.

When yeast operates without oxygen, it relies on fermentation to get energy from sugar. This pathway lets glycolysis continue by regenerating NAD+, which is needed for glycolysis to keep producing ATP. In alcoholic fermentation, pyruvate from glycolysis is first decarboxylated to release carbon dioxide and form acetaldehyde. The acetaldehyde is then reduced by NADH to ethanol, and in the process NAD+ is restored. The CO2 that bubbles off comes specifically from that decarboxylation step. So the production of CO2 under anaerobic conditions in yeast is a hallmark of fermentation, not aerobic respiration or photosynthesis. Anaerobic respiration would require a different final electron acceptor and is not the pathway yeast uses in this context.

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