Which of the following bacteria will grow well in media containing 7.5% sodium c

Question

Which of the following bacteria will grow well in media containing 7.5% sodium chloride? a. Staphylococcus aureus b. Staphylococcus epidermidis c. Staphylococcus saprophyticus d. all of the above e. none of the above An alpha hemolytic bacterium that is positive for the optochin sensitivity and the bile solubility tests: a. S. pneumoniae b. S agalactiae c. S. pyogenes d. all of the above If sodium hyppurate is hydrolyzed, the organism is very likely a. S agalactiae b. S. pyogenes c. S pneumoniae d. S aureus Bacterial decarboxylation of lysine results in the formation of the alkaline end product a. cadaverine b. putrescine c. maltose d. hydrogen sulfide In Xylose Lysine Desoxycholate agar, Salmonella and Shigella colonies are a. orange b. red c. greenish-blue d. yellow Mac Conkey agar, Hektoen enteric agar and Xylose Lysine Desoxycholate agar contain bile salts and/or sodium desoxycholate: a. to inhibit Gram negative bacteria b. to inhibit Candida albicans c. to inhibit coliforms d. to inhibit Gram positive bacteria Kliggler' s iron agar contains femous salts that will react with the hydrogen sulfide liberated by cysteine desulfurase to produce a. an insoluble green precipitate b. an insoluble red precipitate c. an insoluble black precipitate d. a. an insoluble purple precipitate Which of the following bacteria can secrete alpha-toxins? a. Staphylococcus aureus b. Staphylococcus epidermidis c. Staphylococcus saprophyticus d. all of the above SIM medium is a multiple test medium that can determine if an organism is motile or not. Which of the following bacteria is/are motile? a. Staphylococcus aureus b. E coli c. all of the above d. none of the above

Explanation / Answer

42. d) All of above

43. a) Streptococcus pneumoniae

44. a)  S. agalactiae

45. a) Cadaverine

46. b) Red colonies

47. d) Gram positive bacteria

48. c) Black insoluble ppt

49. a)  S. aureus

50. b) Escherichia coli

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