Generation Times Practice Problems

Assume that you inoculated 50 ml milk with ten Lactobacillus acidophilus inoculum to prepare curd. Determine the number of cells in the resulting curd after an incubation of 9 hours, if the genaration time of Lactobacillus acidophilus is 90 minutes.

During which phase does the population of microbial cells double at a constant rate?

What is the characteristic feature of microbial growth during the log phase?

Suppose you inoculate 50 cells of an unknown single type of bacteria onto phenyl ethyl alcohol (PEA) agar. Following 24 hours of incubation, no colonies are observed on the plate. Which of the following statements is therefore accurate?

What would you expect to see in a graph showing bacterial growth (number of viable bacteria vs time) if we introduce a bacteriostatic compound in a bacterial culture?