What is the role of yeast in the fermentation process?
Yeast has been known and loved by humans since ancient times and has been an important ingredient in baking, winemaking, and brewing. During fermentation, yeast cells convert grain-derived sugars into ethanol and CO2. At the same time, hundreds of secondary metabolites are produced that affect the aroma and taste of beer. Differences in these metabolites among different yeast strains are what allow yeast to affect beer flavor so.
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