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Questions and Answers
What type of bacteria does XLD agar selectively isolate?
What type of bacteria does XLD agar selectively isolate?
XLD agar selectively isolates Gram-negative bacteria.
Describe the colony appearance of Salmonella species on XLD agar.
Describe the colony appearance of Salmonella species on XLD agar.
Salmonella species appear as red colonies, some with black centers on XLD agar.
What color colonies are representative of Shigella species on XLD agar?
What color colonies are representative of Shigella species on XLD agar?
Shigella species produce red colonies on XLD agar.
How do coliform bacteria appear when cultured on XLD agar?
How do coliform bacteria appear when cultured on XLD agar?
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What are the characteristics of Pseudomonas aeruginosa colonies on XLD agar?
What are the characteristics of Pseudomonas aeruginosa colonies on XLD agar?
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XLD agar is selective for ______ bacteria.
XLD agar is selective for ______ bacteria.
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Coliforms appear as ______ to orange colonies on XLD agar.
Coliforms appear as ______ to orange colonies on XLD agar.
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Salmonella species typically form ______ colonies, some with black centers.
Salmonella species typically form ______ colonies, some with black centers.
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Shigella species are identified by ______ colonies on XLD agar.
Shigella species are identified by ______ colonies on XLD agar.
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Pseudomonas aeruginosa colonies are described as pink, flat, and ______.
Pseudomonas aeruginosa colonies are described as pink, flat, and ______.
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Study Notes
XLD Agar: Selective Medium for Gram-Negative Bacteria
- XLD agar is a selective medium specifically designed to isolate Gram-negative bacteria.
- Follow the instructions on the agar bottle for proper procedure.
- Primarily used to isolate Salmonella and Shigella from clinical specimens and food.
- Salmonella: Exhibits red colonies, some with black centers.
- Shigella: Displays red colonies.
- Coliforms: Colonies range in color from yellow to orange.
- Pseudomonas aeruginosa: Develops pink, flat, rough colonies.
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Description
This quiz focuses on XLD agar, a selective medium used to isolate Gram-negative bacteria such as Salmonella, Shigella, and Pseudomonas aeruginosa. You'll learn about colony characteristics and the significance of XLD agar in clinical diagnostics and food safety.
