|Yeast cells under a microscope.|
|A diagram of a typical yeast cell|
A particular species of yeast, Saccharomyces cerevisiae, has been used for thousands of years. It is commonly used for baking bread because the yeast produces carbon dioxide as a by-product of it's consumption of sugars. Yeast is also used for making alcoholic beverages such as beer and mead due to a process known as alcoholic fermentation. During this process both ethyl alcohol and carbon dioxide are produced. Ethanol is also used as fuel and to make other organic chemicals.
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