You are growing Bacillus subtilis in a bioreactor and notice that the growth rate has slowed and the pH has decreased. What could you add?
A) peptides
B) lactose
C) oxygen
D) glucose
E) lactic acid

Question

Quizplus · Accepted Answer

The decrease in pH suggests that the culture may be producing acidic byproducts, possibly due to anaerobic conditions. Adding oxygen can help shift metabolism back to aerobic respiration, reducing acid production and potentially increasing the growth rate.

You Are Growing Bacillus Subtilis in a Bioreactor and Notice