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Need help with the questions below

1) What are three reasons one might a situation in which bacterial colonies are found on the first section of a streak plate, but not on sections two and three?

2) How would one determine which colonies might be contaminants on a streak plate?

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When you say 'streak plate', I'm assuming that you are streaking out a single colony of bacteria, or a liquid broth of bacteria to produce a bunch of identical colonies on solid media. If that's the case, then your first section will have the most colonies, generally there are so many colonies that ...