Exercise 4-5 Micro Lab: MacConkey Agar
a selective and differential media containing lactose, bile salts, neutral red, and crystal violet
What do crystal violet and bile salts do?
inhibit growth of gram positive bacteria
neutral red dye is a pH indicator that is _____ at a pH above 6.8 and _____ at a pH of less than 6.8?
Lactose fermenters turn ____ on MacConkey agar, whereas lactose nonfermenters turn ______
their normal color or the color of the medium
formulations without crystal violet allow growth of _______ and some species of ______ which ferment lactose and appear ____ on the medium