posted by Laura .
Suppose I put 1 billion bacteria in a 10 ml tube of saline, mix well, and label this tube A. Answer
the following questions:
1. Take 1 ml from tube A and put it in an empty tube B. What is the concentration and number
of bacteria in tube B?
concn of bacteria in tube A = 1,000,000,000 per 10 mL or 1E9/10 = 1E8 = 100,000,000/mL.
That's the concn (if you want it quoted in bacteria/mL) and the number of bacteria is the same since you put 1 mL in