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Unformatted text preview: observed interactions are examples of commensalisms whereas the antibiotic sensitivity (if the antibiotic was produced directly by another organism near the test organism instead of on disks) would be considered antagonism. Ultimately, these growth inhibitors or promoters can be valuable to select one organism out of many (selection). The MacConkey Agar plates, also, adequately demonstrated selection due to the presence of crystal violet and bile salts, which select against gram positive organisms. It also differentiates which organisms ferment lactose because it contains neutral red....
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This note was uploaded on 04/27/2009 for the course BIO 126L taught by Professor Saxena during the Spring '08 term at University of Texas at Austin.
- Spring '08