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6) How many bacteria would be in 1 ml of the original sample if the 108 dilution has 200 colonies? 7) What criteria must your
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Answer #1

6, Bacteria/mL = No.of .colonies x dilution factor/ volume of culture plated

= 200 x 103/ 0.1

=200 x 104

= 2 x 106 bacteria/mL

7, The colony count in the plate must lie between 30-300 colonies inorder to be considered countable

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