A sample of milk is tested for its bacterial content in a plate count assay.A one-milliliter sample of the milk is diluted in a 1:10 dilution series.One milliliter of the third dilution tube is plated in a pour plate.After incubation,the plate has 54 colonies,indicating that the original milk sample contained
A)54 cells per milliliter. B)540 cells per milliliter. C)5,400 cells per milliliter. D)54,000 cells per milliliter. E)540,000 cells per milliliter.
Which of the following is an advantage of the standard plate count?
A)can readily count cells that form aggregates B)determines the number of viable cells C)can be performed on very dilute samples,such as lake water D)provides immediate results E)can be used to count heat-sensitive bacteria