Final answer:
Glycogen is not a product of fermentation, which is a metabolic process that produces lactate, ethanol, CO₂, and regenerates NAD+ in anaerobic conditions, but glycogen is instead a storage form of glucose.
Step-by-step explanation:
The student has asked which of the following is not a product of fermentation: A) lactate B) CO₂ C) ethanol D) NAD+ E) glycogen. The answer is E) glycogen, as glycogen is not a product of fermentation but rather a storage form of glucose in animals and fungi.
Fermentation is a metabolic process carried out by certain microorganisms and cells in the absence of oxygen (anaerobic conditions). This process converts glucose into energy and creates various byproducts depending on the organism and conditions. In lactic acid fermentation, lactate is produced, which occurs in some bacteria and animal cells, such as muscles during rapid exercise. In alcoholic fermentation, ethanol and carbon dioxide (CO₂) are produced, which is typical in yeast cells and used in the production of beer, wine, and bread. During these fermentation processes, NADH is oxidized to form NAD+, which is necessary for glycolysis to continue.