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S cerevisiae under DIC microscopy.jpg
Yeast of the species Saccharomyces cerevisiae
Cross-sectional 2D diagram of a yeast cell
Cross-sectional labelled diagram of a typical yeast cell
Scientific classification
Domain: Eukaryota
Kingdom: Fungi
Phyla and Subphyla

Ascomycota p. p.

Basidiomycota p. p.

Yeasts are eukaryotic, single-celled microorganisms classified as members of the fungus kingdom. The yeast lineage originated hundreds of millions of years ago, and 1,500 species are currently identified. They are estimated to constitute 1% of all described fungal species. Yeasts are unicellular organisms which evolved from multicellular ancestors, with some species having the ability to develop multicellular characteristics by forming strings of connected budding cells known as pseudohyphae or false hyphae. Yeast sizes vary greatly, depending on species and environment, typically measuring 3–4 µm in diameter, although some yeasts can grow to 40 µm in size. Most yeasts reproduce asexually by mitosis, and many do so by the asymmetric division process known as budding.

Yeasts, with their single-celled growth habit, can be contrasted with molds, which grow hyphae. Fungal species that can take both forms (depending on temperature or other conditions) are called dimorphic fungi ("dimorphic" means "having two forms").

By fermentation, the yeast species Saccharomyces cerevisiae converts carbohydrates to carbon dioxide and alcohols – for thousands of years the carbon dioxide has been used in baking and the alcohol in alcoholic beverages. It is also a centrally important model organism in modern cell biology research, and is one of the most thoroughly researched eukaryotic microorganisms. Researchers have used it to gather information about the biology of the eukaryotic cell and ultimately human biology. Other species of yeasts, such as Candida albicans, are opportunistic pathogens and can cause infections in humans. Yeasts have recently been used to generate electricity in microbial fuel cells, and produce ethanol for the biofuel industry.

  • Alexopoulos CJ, Mims CW, Blackwell M (1996). Introductory Mycology. New York, New York: Wiley. ISBN . 
  • Kirk PM, Cannon PF, Minter DW, Stalpers JA (2008). Dictionary of the Fungi (10th ed.). Wallingford, UK: CAB International. ISBN . 
  • Kurtzman CP; Fell JW; Boekhout T, eds. (2011). The Yeasts: A Taxonomic Study. 1 (5th ed.). Amsterdam, etc.: Elsevier. ISBN . 
  • Moore-Landecker E. (1996). Fundamentals of the Fungi. Englewood Cliffs, New Jersey: Prentice Hall. ISBN . 
  • Priest FG, Stewart GG (2006). Handbook of Brewing (2nd ed.). CRC Press. p. 691. ISBN . 


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