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. What could you add?

Question

Quizplus · Accepted Answer

Adding oxygen would help because Bacillus subtilis is an aerobic bacterium, and the slowed growth rate and decreased pH suggest that the culture may have shifted to fermentation due to insufficient oxygen. Increasing oxygen availability would promote aerobic respiration, improving growth and stabilizing pH.

You Are Growing Bacillus Subtilis, an Aerobic Bacterium That Can