Problem:

Question 1: Why is it important that extracellular fluid is isotonic to cells?

Question 2: Imagine that you have been given several strains of a microbe from various countries around the world and that all the strains are thought to cause the same gastrointestinal disease and to be genetically identical. How can you determine which domain these microbes belong to? Upon carrying out a DNA fingerprint analysis of the strains, you find that four different strain types are present. What would the DNA fingerprint have shown to lead you to this conclusion? Describe two methods you can use to test whether the different strains are actually members of the same species?

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