Week 5 Theory Test

Question 1

Is escherichia coli gram positive or gram negative staining?

Answer 1

Gram negative rod

Question 2

Is pseudomonas aeruginosa gram positive or gram negative staining?

Answer 2

gram negative rod

Question 3

How do we distinguish e.coli and pseudomonas aeruginosa spp.

Answer 3

Pseudomonas is oxidase positive and isn’t a lactose fermenter on MacConkey Agar

Question 4

How does streptococcus pyogenes appear on a gram stain?

Answer 4

Gram positive cocci chains