Imagine you plate .1ml of full strength milk on an NA plate and 250 colonies gre

Question

Imagine you plate .1ml of full strength milk on an NA plate and 250 colonies grew, how many CFU/ml are in the milk?

PLEASE TYPE YOUR ANSWER

Imagine you plate .1ml of full strength milk on an NA plate and 250 colonies grew, how many CFU/ml are in the milk?

NOW .2ml of a 1:100 dilution of milk on a EMB plate and 215 colonies grew. How many CFU/ml are in the original (full concentration) milk?

LASTLY, Imagine you plate .1 ml of a 1:10,000 dilution of milk on a plate 56 dark purple colonies and 144 clear colored colonies grew. How many CFU/ml of coliform bacteria are in the milk?

Explanation / Answer

Answer:

1) Imagine you plate .1ml of full strength milk on an NA plate and 250 colonies grew, how many CFU/ml are in the milk?

2) NOW .2ml of a 1:100 dilution of milk on a EMB plate and 215 colonies grew. How many CFU/ml are in the original (full concentration) milk?

3) LASTLY, Imagine you plate .1 ml of a 1:10,000 dilution of milk on a plate 56 dark purple colonies and 144 clear colored colonies grew. How many CFU/ml of coliform bacteria are in the milk?

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