Yeast is a one-celled organism that provides the leavening (rise) to breads. It is usually sold dry, in small granules, and must be activated with water and heat. Yeast is also used to ferment wine and beer: it consumes sugar, and produces alcohol as a byproduct.

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Is it possible to reproduce yeast at home

Is it possible to reproduce yeast at home (cider yeast to be precise)? I'd like to buy first pack at the yeast-shop and then reproduce them not to buy them any more.