Yeast
Yeast is a group of unicellular fungi, with about 1,500 recognized species.
Yeast is a group of unicellular fungi, with about 1,500 recognized species. They are found worldwide and are important in food production, biotechnology, and some diseases.
What it is
Yeasts are single-celled fungi (eukaryotic microorganisms). Most belong to the phylum Ascomycota, with a smaller number in Basidiomycota. They reproduce mainly by budding, though some use fission.
Why it matters
Yeasts are essential in baking, brewing, and winemaking, especially Saccharomyces cerevisiae. They are also major model organisms in genetics and cell biology. Some yeasts cause infections in humans and animals, including Candida albicans.
Key details
Yeasts are widespread in nature—on plant surfaces, in soil, and in sugary habitats like fruits and flower nectar. They act as decomposers and nutrient recyclers. About 1,500 species are recognized.
In short
- Yeasts are single-celled fungi.
- Most are in Ascomycota.
- Used in bread, beer, and wine.
- Some species cause disease.
Yeast is relevant to Canadian readers through baking, brewing, winemaking, food science, and microbiology research, all of which are active sectors in Canada.
Quick questions
What is yeast?
What is Saccharomyces cerevisiae?
Can yeast cause disease?
Sources
- Britannica — https://www.britannica.com/science/yeast-fungusSupports: Yeast as unicellular fungi; approximate species count; major phyla; ecological distribution; uses; pathogenic species.
- The Canadian Encyclopedia — https://thecanadianencyclopedia.ca/en/article/yeastSupports: Yeast as unicellular fungi; classification; budding and fission; Canadian-reader context.
- Saccharomyces Genome Database — https://wiki.yeastgenome.org/index.php/What_are_yeast%3FSupports: Yeast as single-celled fungi; phylum-level diversity; eukaryotic nature.
- Wikipedia — https://en.wikipedia.org/wiki/YeastSupports: General overview of yeast diversity and reproduction; used cautiously alongside authoritative sources.
- Britannica — https://www.britannica.com/science/Saccharomyces-cerevisiaeSupports: Saccharomyces cerevisiae as baker's/brewer's yeast and its uses in food production and research.