Enterobacteriaceae Exam Questions With Complete

Enterobacteriaceae Exam Questions With Complete ... bb bb bb bb bb




Biochemically, the Enterobacteriaceae are gram-negative rods that: bb bb bb bb bb bb




A. Ferment glucose, reduce nitrate to nitrite, and are oxidase negative
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B. Ferment glucose, produce indophenol oxidase, and form gas
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C. Ferment lactose and reduce nitrite to nitrogen gas
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D. Ferment lactose and produce indophenol oxidase - ANS>>A. Ferment glucose,
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reduce nitrate to nitrite, and
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are oxidase negative
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The ortho-nitrophenyl-β-galactopyranoside (ONPG) test is most useful when
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differentiating:
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A. Salmonella spp. from Pseudomonas spp.
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B. Shigella spp. from some strains of Escherichia coli
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C. Klebsiella spp. from Enterobacter spp.
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D. Proteus vulgaris from Salmonella spp. - ANS>>B. Shigella spp. from some strains
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of Escherichia coli
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The Voges-Proskauer (VP) test detects which end product of glucose fermentation?
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A. Acetoinbb



B. Nitritebb



C. Acetic acid
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D. Hydrogen sulfide - ANS>>A. Acetoin
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At which pH does the methyl red (MR) test become positive?
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A. 7.0 bb



B. 6.5 bb



C. 6.0 bb bb



D. 4.5 - ANS>>D. 4.5
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A positive Simmons citrate test is seen as a:
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A. Blue color in the medium after 24 hours of incubation at 35°C
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B. Red color in the medium after 18 hours of incubation at 35°C
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C. Yellow color in the medium after 24 hours of incubation at 35°C
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D. Green color in the medium after 18 hours of incubation at 35°C - ANS>>A. Blue
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color in the medium after 24 hours of incubation at 35°C
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, In the test for urease production, ammonia reacts to form which product?
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A. Ammonium citrate
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B. Ammonium carbonate
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C. Ammonium oxalate
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D. Ammonium nitrate - ANS>>B. Ammonium carbonate
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Which of the following reagents is added to detect the production of indole?
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A. p-Dimethylaminobenzaldehyde
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B. Bromcresol purple
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C. Methyl red
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D. Cytochrome oxidase - ANS>>A. p-Dimethylaminobenzaldehyde
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Decarboxylation of the amino acids lysine, ornithine, and arginine results in the
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formation of:
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A. Ammonia
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B. Urea
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C. CO2bb



D. Amines - ANS>>D. Amines
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Lysine iron agar (LIA) showing a purple slant and a blackened butt indicates:
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A. E. coli
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B. Citrobacter spp.
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C. Salmonella spp.
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D. Proteus spp. - ANS>>C. Salmonella spp.
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Putrescine is an alkaline amine product of which bacterial enzyme?
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A. Arginine decarboxylase
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B. Phenylalanine deaminase
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C. Ornithine decarboxylase
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D. Lysine decarboxylase - ANS>>C. Ornithine decarboxylase
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Which genera are positive for phenylalanine deaminase?
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A. Enterobacter, Escherichia, and Salmonella
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B. Morganella, Providencia, and Proteus
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C. Klebsiella and Enterobacter
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D. Proteus, Escherichia, and Shigella - ANS>>B. Morganella, Providencia, and
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Proteus
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Kligler iron agar (KIA) differs from triple-sugar iron agar (TSI) in the:
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