Lab 4 Quiz

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5 Terms

1
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Cross streaking

Used to isolate individual colonies. Repeated 3 times. Individual colonies observed in 4th.

2
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Selective media

Used to inhibit the growth in a specific microorganism population. Mannitol Salt Agar. Sodium chloride

3
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Differential media

Highlight a certain microorganism’s metabolic capacity. Phenol red. Mannitol. Lactose fermentation

4
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Biochemical tests

Used to identify isolated colonies. Justified in the principle that microorganism’s species share a metabolism patter that can be shown with a simple set of tests. TSI used for coliform microorganism classification.

5
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Optimal decision tree

Divides the results by the positive or negative outcome after a biochemical test.