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{{Taxobox
| name = ''Yeast''
| image = S cerevisiae under DIC microscopy.jpg
| image_width = 250px
| image_caption = Yeast cells under a [[microscope]].
| image2 = Simple diagram of yeast cell (en).svg
| image2_width = 250px
| image2_caption = A diagram of a typical yeast cell
| domain = [[Eukaryote|Eukaryota]]
| regnum = [[Fungus|Fungi]]
| subdivision_ranks = Typical divisions
| subdivision = <div>
'''[[Ascomycota]]''' <small>(sac fungi)</small>
* [[Saccharomycotina]] <small>(true yeasts)</small>
* [[Taphrinomycotina]]
** [[Schizosaccharomycetes]] <small>(fission yeasts)</small>
</div>
}}

'''Yeast''' are [[microorganism]]s. They are single-[[cell]]ed  [[fungi]]. There are about 1,500 different [[species]] of yeast. Most reproduce [[asexual reproduction|asexually]], by [[budding]]. Some use [[binary fission]] to reproduce asexually.

A particular [[species]] of yeast, '''''Saccharomyces cerevisiae''''', has been used for thousands of years. It is used for baking [[bread]] because the yeast makes [[carbon dioxide]] as a by-product of it eating sugar, which helps the bread rise ([[Leavening agent|leaven]]). Yeast is also used for making [[beer]] and other [[alcoholic drink]]s by a process known as [[fermentation]]. This process produces both [[Ethanol|ethyl alcohol]] and carbon dioxide. Ethanol is also used as [[fuel]], and to make other [[organic chemical]]s. 

Yeast can be used to make [[electricity]].  Yeast is also a [[model organism]] for studying [[cell biology]]. Some yeasts can cause [[infection]]s in [[human]]s (they are  [[pathogen]]s).

<gallery>
Image:Compressed fresh yeast - 1.jpg|A block of fresh yeast
Image:Dry yeast.jpg|Dry yeast (usually, yeast is sold like this)
</gallery>

==Related pages==
* [[Mycorrhiza]]
* [[Mould]]
* [[Slime mould]]
* [[Lichen]]
* ''[[Candida]]''
* [[Fungus]]

==References==
{{reflist}}

==Other websites==
{{commonscat-inline}}

{{Mycoses}}
{{Fungus}}
{{biology-stub}}

[[Category:Fungi]]

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