Confirmed Test- Lab 42 Flashcards Preview

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Flashcards in Confirmed Test- Lab 42 Deck (7)
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1

Why is EMB a selective medium

Because it selects for gram negative bacteria against gram positive

2

Why is EMB a differential medium

Because it differentiates coliforms from non coliforms

3

Describe the E. Coli group

The acid forms dark purple colonies with green metallic sheen

4

Describe the Enterobacter aerogenes group

It forms a pink to purple colonies. No green metallic sheen

5

Describe non coliforms

They form colorless colonies

6

Why is a green sheen produces by E. Coli

Many acids of E. Coli work on the medium to produce a color effect to make the medium appear green

7

What're the names of the differential & selective mediums for coliforms

Eosin methylene blue (EMB)