Yeast

Yeasts – generic name given to a group of single-celled microorganisms (microscopic fungi) capable of producing zymase, the enzyme responsible for converting sugars into alcohol during fermentation of a sweet liquid. The most important yeasts in wine making are those of the genus Saccharomyces.

There is no morpho-physiological or functional difference between wild and selected yeasts of the same Saccharomycetae species.