As we all know, beer basically has four ingredients: water, barely, hops and yeast.
Ok, other grains get thrown in from time to time, style to style. And fruit. And chocolate.... anyway, what I'm getting to is that each of the four has its own role to play.
The folks at Southyeast labs can tell you in greater detail, but meanwhile, here is a fairly in-depth account of yeast's importance:
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