A 10-5 dilution is performed on a culture of bacteria in order to perform viable plate counts. From the dilution, *0.1 mL* of solution is plated on solid media, and 278 colony forming units grow on the plate.    How many bacteria are in a single mL of the original culture? Express your answer to two decimal places using scientific notation

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A 10-5 dilution is performed on a culture of bacteria in order to perform viable plate counts. From the dilution, *0.1 mL* of solution is plated on solid media, and 278 colony forming units grow on the plate. 

 

How many bacteria are in a single mL of the original culture? Express your answer to two decimal places using scientific notation. In scientific notation 540 would be written as 5.40*10^2. 

  • Since only 0.1 mL is put on the plate, this counts as an extra dilution!!!
  • Any time less than 1 mL is transferred, a dilution is being performed.
  • Any time more than 1 mL is transferred, a concentration is being performed.
  • Include the trailing zero so there are two decimal places
  • Canvas expects a single digit before the decimal point.
    • 5.40*10^2 is how Canvas expects 540 to be formatted in scientific notation
    • 54.00*10^1 would be marked wrong.
    • 0.54*10^3 would be marked wrong.

A 10-5 dilution is performed on a culture of bacteria in order to perform viable plate counts. From the dilution, *0.1 mL* of solution is plated on solid media, and 278 colony forming units grow on the plate. 

 

How many bacteria are in a single mL of the original culture? Express your answer to two decimal places using scientific notation. In scientific notation 540 would be written as 5.40*10^2. 

  • Since only 0.1 mL is put on the plate, this counts as an extra dilution!!!
  • Any time less than 1 mL is transferred, a dilution is being performed.
  • Any time more than 1 mL is transferred, a concentration is being performed.
  • Include the trailing zero so there are two decimal places
  • Canvas expects a single digit before the decimal point.
    • 5.40*10^2 is how Canvas expects 540 to be formatted in scientific notation
    • 54.00*10^1 would be marked wrong.
    • 0.54*10^3 would be marked wrong.
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