Fermentation occurs in the absence of oxygen.

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Multiple Choice

Fermentation occurs in the absence of oxygen.

Explanation:
Fermentation is an anaerobic pathway that regenerates NAD+ to keep glycolysis running when oxygen isn’t available. During glycolysis, NAD+ is reduced to NADH, and fermentation converts NADH back to NAD+ by transferring electrons to an organic molecule such as pyruvate (lactic acid fermentation) or acetaldehyde (alcohol fermentation). This all happens in the cytosol and does not require mitochondria or oxygen, so it proceeds under anaerobic conditions. Because of that, the statement that fermentation occurs in the absence of oxygen is true.

Fermentation is an anaerobic pathway that regenerates NAD+ to keep glycolysis running when oxygen isn’t available. During glycolysis, NAD+ is reduced to NADH, and fermentation converts NADH back to NAD+ by transferring electrons to an organic molecule such as pyruvate (lactic acid fermentation) or acetaldehyde (alcohol fermentation). This all happens in the cytosol and does not require mitochondria or oxygen, so it proceeds under anaerobic conditions. Because of that, the statement that fermentation occurs in the absence of oxygen is true.

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