What is a product of fermentation that is NOT produced during glycolysis?

The correct response identifies a product of fermentation that differs from those generated during glycolysis, which is a critical process in cellular respiration. During glycolysis, glucose is broken down to yield pyruvic acid, ATP, and NADH.

In contrast, fermentation occurs after glycolysis when oxygen is not available for aerobic respiration. One key difference is that fermentation regenerates NAD+ from NADH, which is essential for glycolysis to continue without the presence of oxygen. However, fermentation itself does not produce ATP in the same manner as glycolysis does; it mainly serves to regenerate NAD+ and possibly produce other end products depending on the type of fermentation (such as ethanol or lactic acid).

Thus, while glycolysis does yield ATP, fermentation primarily focuses on regenerating NAD+, which is not a product arising from glycolysis itself but is crucial for sustaining the process in anaerobic conditions.