This is the preferred route since much more ATP is made. The purpose of fermentation is to keep glycolysis going by recycling materials needed for glycolysis. Types of fermentations - based upon end product 1. Many microbes can ferment sugars to alcohol.
Yeasts are single-celled fungi.
The most important yeast is Saccharomyces . It tolerates more alcohol than other fungi. Products of alcohol fermentations Two commercially important products are alcohol and carbon dioxide. Alcohol is obviously the product of choice in the beer, wine and distilled spirits industries, whereas the carbon dioxide is used by the bread makers. B. Step 1.