bacteria photos
Colonies on bile-esculin agar,
24 hours, 37°C.
49. Bile-esculin agar is used for:
  • the isolation and presumptive identification of group D streptococci
  • the isolation and presumptive identification of staphylococci
  • presumptive identification of nutritionally fastidious Enterobacteriaceae
50. Enterococcus faecalis is:
  • bile-sensitive, esculin positive (blackening of media)
  • bile-tolerant, esculin positive (blackening of media)
  • fastidious, doesn't grow on bile-esculin agar
51. Enterococci grow in:
  • clusters of cocci
  • chains of cocci (often ovoid cells)
  • tetrads
52. Enterococcus faecalis is:
  • catalase negative, oxidase negative
  • catalase positive, oxidase negative
  • catalase positive, the oxidase test gives variable results
Growth on blood agar,
24 hours, 37°C.

53. This growth pattern is typical for:
  • Proteus mirabilis and Proteus vulgaris
  • Providencia spp. and Morganella morganii
  • for most species in genus Proteus, Providencia and Morganella (tribe Proteeae)
54. This type of spreadind is:
  • is characteristic for many other clinically important bacteria
  • is enabled by peritrichous flagella
  • has no practical importance in clinical microbiology
55. Most Proteeae exhibit a certain characteristic:
  • smell
  • polar arrangemen of flagella (1-5 polar flagella)
  • polar stainig of cells (in Gram stain)
56. Proteeae:
  • rarely cause urinary tract infections
  • cause acidification of the urine due to urea hydrolysis
  • reside in the intestines of healthy humans and animals