fermentation
Two different pathways accomplish the regeneration of NAD + with rather famous products: lactic acid C 3 H 6 O 3 and ethyl alcohol C 2 H 6 O Figure above . Making ATP in the absence of oxygen by glycolysis alone is known as fermentation . Therefore, these two pathways are called lactic acid fermentation and alcoholic fermentation . If you lack interest in organisms, such as yeast and bacteria, which have stuck with the anaerobic tradition, the products of these chemical reactions may still intrigue you. Fermentation makes bread, yogurt, beer, wine, and some new biofuels. In addition, some of your bodys cells are facultative anaerobes, retaining one of these ancient pathways for short-term, emergency use.