E-PolyLearning

56. A medium containing crystal violet dye plus sodium deoxycholate will allow
a. gram (-)ve intestinal bacteria to grow
b. gram (+)ve intestinal bacteria to grow
c. aquatic bacteria to grow
d. none of these
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Answer: (a).gram (-)ve intestinal bacteria to grow

57. Which of the following bacteria can grow in alkaline pH?
a. Shigella
b. Lactobacilli
c. Salmonella
d. Vibrio cholerae
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Answer: (d).Vibrio cholerae

58. All bacteria that inhabit the human body are
a. heterotrophs
b. chemolithotrophs
c. autotrophs
d. phototroph
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Answer: (a).heterotrophs

59. When a substance is added to a liquid medium which inhibits the growth of unwanted bacteria and favors the growth of wanted bacteria, it is known as
a. differential medium
b. enriched medium
c. enrichment medium
d. selective medium
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Answer: (c).enrichment medium

60. Which of the following methods is most likely to be quantitative?
a. Dilution and plating
b. Gram staining
c. Wet mount
d. None of these
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Answer: (a).Dilution and plating