Agar Types and Applications Quiz

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Questions and Answers

What is the primary purpose of R2A agar?

Isolation of Corynebacterium diphtheriae
Growth of general bacteria in laboratory settings
Culturing stool samples
Analysis of water samples (correct)

Which agar is specifically designed to inhibit Gram-positive bacterial growth?

Tryptic soy agar
Xylose-lysine-deoxycholate agar (correct)
Tinsdale agar
Nutrient agar

Which of the following media can support the growth of Corynebacterium species?

Chocolate agar
R2A agar
Tryptic soy agar (correct)
Xylose-lysine-deoxycholate agar

What specific bacterium is Tinsdale agar primarily used to isolate?

<p>Corynebacterium diphtheriae (C)</p> Signup and view all the answers

Which agar serves as a base medium for various other agar types?

<p>Tryptic soy agar (A)</p> Signup and view all the answers

Flashcards

R2A agar

A selective medium used in water analysis to isolate specific bacteria.

Tinsdale agar

A selective medium used to isolate Corynebacterium diphtheriae, the causative agent of diphtheria.

Tryptic soy agar (TSA)

A general purpose media used to support the growth of a wide range of bacteria, including Brucella, Corynebacterium, Listeria, Neisseria, and Vibrio species.

Xylose-lysine-deoxycholate agar (XLD)

A selective medium used to culture stool samples, particularly for isolating Gram-negative bacteria while inhibiting growth of Gram-positive bacteria.

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What type of bacteria does XLD agar inhibit?

Gram positive bacteria.

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Study Notes

Agar Types and Applications

R2A agar is used for analyzing water samples.
Tinsdale agar is used to isolate Corynebacterium diphtheriae.
Tryptic soy agar (TSA) is a general-purpose media, fundamental for other agars. It supports the growth of Brucella, Corynebacterium, Listeria, Neisseria, and Vibrio species.
Xylose-lysine-deoxycholate agar (XLD) is used to culture stool samples, promoting Gram-negative bacterial growth while inhibiting Gram-positive growth.