Evolution

Aerobic fermentation is metabolic process by which cells metabolize sugars via fermentation in the presence of oxygen, this occurs through a repression of the respiratory metabolism (also referred to as the crabtree effect in yeast). This phenomenon is fairly rare and is primarily observed in yeasts. Aerobic fermentation evolved independently in at least three yeast lineages (Saccharomyces, Dekkera, Schizosaccharomyces). It has also been observed in plant pollen, trypanosomatids, mutated E. coli, and tumor cells. Crabtree-positive yeasts will respire when grown with very low concentrations of glucose or when grown on most other carbohydrate sources. The Crabtree effect is a regulatory system whereby respiration is repressed by fermentation, except in low sugar conditions. Excerpt from: https://en.wikipedia.org/wiki/Evolution_of_aerobic_fermentation Hint: You can preview this book by clicking on "Preview" which is located under the cover of this book.