When yeast cells are O2 starved, fermentation serves as the source of energy. This results in the production of :
- A.ATP + CO2 + Ethanol
- B.ATP + O2 + Pyruvate
- C.ATP + CO2 + Lactic acid
- D.ATP + O2 + Acetaldehyde
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Without oxygen, yeast carries out alcoholic fermentation, breaking glucose into ethanol and carbon dioxide and gaining a little ATP. Glucose is first split into two molecules of pyruvate by glycolysis, which yields a net gain of two ATP.
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