Microorganisms that catabolize sugars into ethanol and hydrogen gas would most likely be categorized as heterolactic fermenters.
Fermentation is any of many anaerobic biochemical reactions in which an enzymes produced by a microorganism catalyses the conversion of one substance into another.
Fermentation especially involves the conversion (using yeast) of sugars to alcohol or acetic acid with the evolution of carbon dioxide.
However, fermentation can either be homolactic or heterolactic. The conversion of one glucose molecule into two lactic acid molecules is homolactic fermentation while the conversion of one glucose molecule into lactic acid, carbon dioxide, and ethanol is known as heterolactic fermentation.
Therefore, it can be said that microorganisms that catabolize sugars into ethanol and hydrogen gas would most likely be categorized as heterolactic fermenters.
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