Confirmed Test- Lab 42 Flashcards
1
Q
Why is EMB a selective medium
A
Because it selects for gram negative bacteria against gram positive
2
Q
Why is EMB a differential medium
A
Because it differentiates coliforms from non coliforms
3
Q
Describe the E. Coli group
A
The acid forms dark purple colonies with green metallic sheen
4
Q
Describe the Enterobacter aerogenes group
A
It forms a pink to purple colonies. No green metallic sheen
5
Q
Describe non coliforms
A
They form colorless colonies
6
Q
Why is a green sheen produces by E. Coli
A
Many acids of E. Coli work on the medium to produce a color effect to make the medium appear green
7
Q
What’re the names of the differential & selective mediums for coliforms
A
Eosin methylene blue (EMB)
