There's no single answer. Tempeh mold needs oxygen. A lot of CO2 gas from the fermentation is infused within the wine must at this point. The main difference between lactic acid and alcoholic fermentation is that lactic acid fermentation produces lactic acid molecules from pyruvate whereas alcoholic fermentation produces ethyl alcohol and carbon dioxide. To do this breeding yeast devours dissolved oxygen in your fermenting wine. During glycolysis, NAD+ is reduced to NADH and 2 net ATPs are produced. A) Fermentation involves the citric acid cycle. However, even when oxygen is abundant, yeast cells prefer fermentation to aerobic respiration, provided a sufficient supply of sugar is available. Oxygen is rapidly absorbed from the wort during the lag phase. Fermentation occurs in the absence of oxygen (anaerobic conditions), and in the presence of beneļ¬cial microorganisms (yeasts, molds, and bacteria) that obtain their energy through fermentation. How cells extract energy from glucose without oxygen. Yeast requires high levels of oxygen in order to do their wonderful job of taking sugar in the must (grape juice and concentrate) and making alcohol. C) Fermentation can produce lactic acid. The yeast need this oxygen to multiply successfully. It is important to introduce enough oxygen into wort at the beginning of fermentation. E) Fermentation can produce alcohol. Thus, aerobic fermentation does not actually refer to a fermentation process; this process refers to the process of cellular respiration. Lactic acid fermentation is anaerobic, and you don't want oxygen getting in there. Which of the following statements about fermentation is NOT true? Fermentation occurs in the digestive system of humans and other animals. The yeast need this oxygen to grow and to produce important cell wall constituents. This makes it very hard for excessive oxygen to saturate into the wine and cause oxidation. Fermentation Facts . The term Aerobic fermentation is a misnomer since fermentation is anaerobic, i.e., it does not require Oxygen. Metabolism without Oxygen: Fermentation In aerobic respiration, the final electron acceptor for the electron transport chain is an oxygen molecule, O 2.If aerobic respiration occurs, then approximately 30 molecules of ATP will be produced during the electron transport chain and chemiosmosis using the energy of the high-energy electrons carried by NADH or FADH 2 to the electron transport chain. Fermentation starts with glycolysis, which does not require oxygen, but it does not involve the latter two stages of aerobic cellular respiration (the Krebs cycle and electron transport). Therefore, both lactic acid and alcoholic fermentation do not require oxygen. CO2 is also coming off the fermentation as a gas. B) Fermentation does not require oxygen. This is especially important during the early hours and days of fermentation. 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