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26.5: Post-lab Questions

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    1. Why is E. coli used as the test organism in water testing?
    2. Why isn’t it necessary to include a pH indicator in the lactose broth tubes?
    3. What is the MPN chart based on?
    4. We omitted the completed test. However, based on your results, what would you have expected to see in the completed test and gram stain?
    5. Why would water samples for the Membrane Filter Technique need to be fairly clear and not turbid?
    6. What tests that you did today were qualitative? Which were quantitative?
    7. Can media be sterilized by filtration? Explain your answer.

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