Colonies growing on modified cefsulodin-irgasan-novobiocin (CIN) agar appear to be either Aeromonas spp. or Yersinia enterocolitica. Which test should be performed to differentiate be-tween these two organisms?

a. String test
b. Sucrose fermentation
c. Glucose fermentation
d. Oxidase


D
Aeromonas spp. are indistinguishable from Y. enterocolitica on modified CIN (4 ?g cefsulodin per mL) agar; therefore, performing an oxidase test to differentiate these two genera is important.

Biology & Microbiology

You might also like to view...

Lichens are adversely affected by  

A.  humidity. B.  sunlight. C.  pollution. D.  sexual reproduction of the fungal partner. E.  asexual reproduction of the photosynthetic partner.

Biology & Microbiology

The primary thermostat of the body is located in the

a. heart. b. hypothalamus. c. medulla oblongata. d. cerebellum. e. thyroid gland.

Biology & Microbiology

Optical density

A. is directly related to the population of bacteria B. is used to measure bacterial toxicity C. None of these D. is directly related to the length of bacteria E. is measured by spread plate technique

Biology & Microbiology

What is the major difference between the cell walls of gram-positive and gram-negative bacteria?

A. the cell wall of gram-positive bacteria contains mycolic acids B. the peptidoglycan layer in gram-positive bacteria is substantially thicker C. gram-positive bacteria may have a polysaccharide capsule as a covering D. gram-positive bacteria contain a cytoplasmic membrane E. all of the above are correct

Biology & Microbiology