Question

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m to make
105,0.1 ml of a bacterial culture is diluted into 9.9
ml of buffer; 0.1 ml of this dilution is again
diluted in 9.9 ml of fresh buffer. Plating 0.1
ml from the second dilution tube yields an
average of 72 colonies on the plate. What is
the cell density of the culture?
A. 7.2 x 106 cells per ml
B. 7.2 x 105 cells per ml
C. 7.2 x 108 cells per ml
D. 7.2 x 107 cells per ml
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Answer 1

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Answer 2

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