BIOL 1153 Study Guide - Quiz Guide: Colistin, Oxidase Test, Enterobacteriaceae
28 Apr 2020
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Quiz 3 covers lab 6 (exercises 4 1 through 4 6 and 5 21), lab 7 (exercises 5 1 through 5 6), and lab 8 (exercises 5 7, 5 9, 5 11, 5 12, 5 18, 5 19, 5 24) Lab 6: selective & differential media: understand what these are & how they differ. Selective media: contains chemical components that inhibit certain bacteria, favors the growth of others. Differential media: can visualize metabolic differences between bacterial types. Should know how bacteria will appear on differential media and what it means; e. g. , purplish colonies on macconkey agar = gram negative lactose fermenter. Selective for gram positives: know selective & differential nature of: mannitol salt agar, phenylethyl alcohol. Selective for gram negatives: the enterobacteriaceae: coliforms/non coliforms, coliform bacteria are organisms that are present in the environment and in the feces of all warm-blooded animals and humans. Will not cause illness unless present in drinking water.
