When you brew, dead yeast will fall to the bottom of your fermentation vessel. LIVE YEAST swims around... When you are drinking live beer (labeled bottle conditioned) you will see sediment at the bottom of the bottle, which is dead yeast... All force carbonated beer sold in high volume is pasteurized, which kills all yeast.
So pretty much, all beer you drink has dead yeast in it. Brewers yeast is definitely active.
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