Problem:
Question 1: Which one of these organisms would you expect to appear pink after performing the acid-fast stain?
Select one or more:
a. Mycobacterium smegmatis
b. Mycobacterium tuberculosis
c. Escherichia coli
d. Bacillus megaterium
Question 2: If your countable plate has 50 colonies on it and the dilution factor of the plated sample is 10^-4, What is the cfu/ml of the original sample?
Select one:
a. 5 X 10^5 cfu/ml
b. 50 x 10^5 cfu/ml
c. 100 cfu/ml
d. 5.0 x 10^4 cfu/ml
e. 5000
Please provide correct answer.