Final answer:
A source of nitrogen and glucose is added to sustain the growth of Bacillus megaterium in a laboratory fermenter. The contents of the fermenter are continuously stirred to ensure proper nutrient mixing and optimal gas exchange.
Step-by-step explanation:
In order to sustain the growth of the bacterium Bacillus megaterium in a laboratory fermenter, a source of nitrogen and glucose is added. Nitrogen is an essential component for the synthesis of proteins and nucleic acids, which are necessary for cell growth and replication. Glucose, as a carbohydrate, serves as a source of energy for the bacterium through the process of glycolysis and subsequent fermentation.
It is important to stir the contents of the fermenter continuously to ensure proper mixing of nutrients and oxygen. Stirring promotes uniform distribution of nutrients throughout the culture, preventing local nutrient depletion and enabling optimal contact between the microbial cells and the nutrients. It also prevents the formation of concentration gradients and facilitates efficient gas exchange, ensuring an adequate supply of oxygen for aerobic respiration.