Thirty-six colonies grew on nutrient agar from 1.0 ml of undiluted sample in a standard plate count. How many cells were in the original sample?

Thirty-six colonies grew on nutrient agar from 1.0 ml of undiluted sample in a standard plate count. How many cells were in the original sample?



A. 4
B. 9
C. 18
D. 36
E. 72


Answer: D. 36


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