You are growing Bacillus subtilis,an aerobic bacterium that can also carry out fermentation,when required,in a bioreactor and notice that the growth rate has slowed and the pH has decreased.You suspect the bacteria are

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The decrease in pH suggests that the bacteria are producing acidic waste products through fermentation, which can occur when oxygen levels are limited or depleted. This is a common strategy for cells to continue generating ATP even in the absence of oxygen.

You Are Growing Bacillus Subtilis,an Aerobic Bacterium That Can Also