Is yeast a bacteria?
Yeast is commonly used in baking, beer brewing and wine making. It has used been for this purpose for thousands of years, and evidence of bakeries and breweries has been found in ancient Egyptian ruins. Saccharomyces cerevisiae is the species of yeast that is most commonly used for these purposes. When conditions are less than ideal, yeast reproduces sexually by fusing together with other yeast cells. Source: en.wikipedia.org