4. Dilution and Analysis

Try these first

1. 1.

   Define CFU.

   Hint

   What does CFU stand for?

2. 2.

   What does turbidity mean?

   Hint

   What term describes how clear or cloudy water is?

3. 3.

   What does CFU stand for?

   • Colony Formation Unit
   • Colony Forming Unit
   • Cell Formation Unit

   Hint

   Think about what measurement is used for viable bacteria.

4. 4.

   True or False: Turbidity guarantees the presence of viable pathogens.

   • True
   • False

   Hint

   Consider what needs to be done to assess whether microorganisms are viable.

5. 5.

   A water tank sample is taken, showing 300 visible colonies after incubation. If the dilution factor was 100 times, calculate the original concentration of bacteria in the water sample.

   Hint

   Make sure to use the dilution factor correctly.

6. 6.

   Explain the implications of high turbidity and non-viable bacteria on water quality assessment.

   Hint

   Think about your previous learning on viable vs. non-viable organisms.