Yeast is from the single celled group of creatures, resulting in the purification of the ``Saccharomyces cerevisiae`` strain.
Yeast cells are round or oval in shape, ranging in size from 2-3 μm to 20-50 μm. 1 gr of yeast contains about 10 billion cells.
Yeast cells dissolve the sugar in the dough and remove CO2 gas to provide dough rash.
Dry yeasts are presented in a vacuum package with the aim of providing storage conditions for a long time.