Microbiology Agar Stuff

Question 1

What colour is chocolate agar

Answer 1

Brown

Question 2

What colour is nutrient agar

What bacteria is indicated if there is green pigment on nutrient agar?

Answer 2

Transparent

Pseudomonas aeruginosa

Question 3

What colour is MacConkey agar

What is the component of MacConkey agar, name 2

What type of bacteria does MacConkey Agar inhibit

What colour will appear on MacConkey Agar for
Lactose fermenters (e.g. Escherichia Coli)
Lactose non-fermenters (e.g. Salmonella)

Answer 3

What colour is MacConkey agar
Red

What is the component of MacConkey agar, name 2
Lactose, Bile salts

What type of bacteria does MacConkey Agar inhibit
Gram Positive Bacteria

What colour will appear on MacConkey Agar for Lactose fermenters: Pink
Lactose non-fermenters: Pale

Question 4

What colour is XLD Agar

What bacteria is indicated when there is red colonies with black centres on XLD Agar
And what are the black centres

What bacteria is indicated when there is red colonies without black centres on XLD Agar

What bacteria is indicated when there is yellow colonies on XLD Agar (name 2)

Answer 4

What colour is XLD Agar- RED

What bacteria is indicated when there is red colonies with black centres on XLD Agar- SALMONELLA
And what are the black centres- H2S

What bacteria is indicated when there is red colonies without black centres on XLD Agar- SHIGELLA

What bacteria is indicated when there is yellow colonies on XLD Agar (name 2)

• Escherichia Coli
• Klebsiella

Question 5

What bacteria is allowed to grow on Thayer-Martin Agar

Answer 5

Neisseria Gonorrhoea

Question 6

What bacteria is allowed to grow on LJ Medium

Answer 6

Mycobacteria