Single Cell Organism

Yeast

Yeast is a unicellular organism that is a fungus. Yeast can be found in beer. It only contains one cell and its function is to convert grains ultimately creating beer. Yeast is the most important ingredient to brew beer. The yeast brews the beer using fermentation. Yeast is a living organism, metabolizing, reproducing, and feeding off the ingredients in the beer. It converts sugar to alcohol and carbon dioxide in the fermentation stage. Yeast can also determines the flavor of the beer.