MacConkey Agar Flashcards


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created 5 years ago by Brittany_Mock
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1

What is the application (purpose) of MacConkey agar?

Used to isolate and differentiate members of the enterobacteriaceae based on the ability to ferment lactose.

2

What does carbon supply in the MCC agar?

____ supplies pancreatic digest of gelatin and casein in MCC agar

3

What does Nitrogen supply in the MCC agar?

____ supplies peptic digest of animal tissue

4

What are the roles of crystal violet and bile salts in MacConkey agar?

Inhibit the growth of gram positive bacteria

5

What are the roles of neutral red and lactose in MacConkey agar?

Neutral red is a pH indicator à COLORLESS: 6.8 +; RED: below 6.8

Lactose – fermented to produce acid end products which lower the pH and turn colonies pink-red