Exercise 4-5 Micro Lab: MacConkey Agar

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1

MacConkey Agar

a selective and differential media containing lactose, bile salts, neutral red, and crystal violet

2

What do crystal violet and bile salts do?

inhibit growth of gram positive bacteria

3

neutral red dye is a pH indicator that is _____ at a pH above 6.8 and _____ at a pH of less than 6.8?

colorless
red

4

Lactose fermenters turn ____ on MacConkey agar, whereas lactose nonfermenters turn ______

red
their normal color or the color of the medium

5

formulations without crystal violet allow growth of _______ and some species of ______ which ferment lactose and appear ____ on the medium

Enterococcus
Staphylococcus
pink