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Macconkey Agar Lab Report

266 Words2 Pages

“Post-Lab Questions”
What ingredient(s) makes MacConkey agar selective for Gram-negative bacteria? The ingredients that make MacConkey’s Agar selective is a pH indicator (neutral red), and a disaccharide ( Lactose)
“2. What types of bacteria are inhibited on MacConkey agar?”
Gram-Positive bacteria that are inhibited with MacConkey agar due to crystal violet and bile salt presence .
“3. What ingredient(s) makes MacConkey agar differential?”
MacConkey agar are inhibited by a pH indicator (neutral red), and a disaccharide ( Lactose)
“4. Why is an indicator dye used in MacConkey agar?”
An indicator dye is used in the MacConkey Agar to indicate lactose fermentation by the bacteria which turn the medium a pinkish color
“5. What are some potentially

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