yeast See yeasts.

yeasts n. A group of unicellular fungi within the class Hemiascomycetae of the phylum Ascomycota. They occur as single cells or as groups or chains of cells; yeasts reproduce asexually by budding and sexually by producing ascospores. Some yeasts show sexual reproduction. Yeasts of the genus Saccharomyces ferment sugars and are used in the baking and brewing industries. Yeast extracts are used as a food for their high vitamin B content. Yeasts are also used as tools in genetic research, as cloning vectors in genetic engineering, and as a source of protein. Some yeasts, including Candida albicans cause disease in humans.

young growth See advance growth.