BOC Microbiology Test Study -Questions with
100% Correct Answers | Verified
Which genera are positive for phenylalanine deaminase?
----Enterobacter, Escherichia, and Salmonella
----Morganella, Providencia, and Proteus
----Klebsiella and Enterobacter
----Proteus, Escherichia, and Shigella - ✔✔Morganella, Providencia and Proteus
Kligler iron agar (KIA) differs from triple-sugar iron agar (TSI) in the: - ✔✔The use of
sucrose in the medium
The malonate test is most useful in defferentiating which members of the
Enterobacteriaceae? - ✔✔Salmonella subgroups 2, and 3 (the former Arizona)
Which genera of the Enterobacteriaceae are known to cause diarrhea and are
considered enteric pathogens? - ✔✔Escherichia, Salmonella, Shigella, and Yersinia
An isolate of E.coli recovered from the stool of a patient with severe bloody diarrhea
should be tested for which sugar before sending it to a reference laboratory for
serotyping? - ✔✔Sorbitol (fermentation)
Care must be taken when identifying biochemical isolates of Shigella because serological
cross reactions occur with: - ✔✔E. coli
Which species of Shigella is most commonly associated with diarrheal disease in the
united states? - ✔✔S. sonnei
, Which of the following tests best differentiates Shigella species from E. coli? -
✔✔Lactose, indole, ONPG, and motility (Shigella is negative for all)
Which genera of Enterobacteriaceae ae usually nonmotile at 36C? - ✔✔Shigella,
Klebsiella, and Yersinia
Fever, abdominal cramping, watery stools, and fluid and elecrolyte loss preceded by
bloody stools 2-3 days before is characteristic of shigellosis, but may also result from
infection with: - ✔✔Campylobacter spp.
Cold enrichment of feces (incubation at 4C) in phosphate-buffered saline prior to
subculture onto enteric media enhances the recovery of: - ✔✔Yersinia enterocolitica
Which group of tests, along with colonial morphology on primary media, aids most in
the rapid identification of the Enterobacteriaceae? - ✔✔Indole, oxidase, MacConkey,
and Blood agar plates
A routine, complete stool culture procedure should include media for the isolation of E.
coli O157:H7 as well as: - ✔✔Salmonella, Shigella, Yersinia, Campylobacter and
Staphylococcus aureus.
Which group of tests best identifies the Morganella and Proteus genera? -
✔✔Motility, urease, and phenylalanine deaminase
Which group of test best differentiates Enterobacter aerogenes from Edwardsiella
tarda? - ✔✔Hydrogen sulfide(H2S) production, sucrose fermentation, indole, and VP.
100% Correct Answers | Verified
Which genera are positive for phenylalanine deaminase?
----Enterobacter, Escherichia, and Salmonella
----Morganella, Providencia, and Proteus
----Klebsiella and Enterobacter
----Proteus, Escherichia, and Shigella - ✔✔Morganella, Providencia and Proteus
Kligler iron agar (KIA) differs from triple-sugar iron agar (TSI) in the: - ✔✔The use of
sucrose in the medium
The malonate test is most useful in defferentiating which members of the
Enterobacteriaceae? - ✔✔Salmonella subgroups 2, and 3 (the former Arizona)
Which genera of the Enterobacteriaceae are known to cause diarrhea and are
considered enteric pathogens? - ✔✔Escherichia, Salmonella, Shigella, and Yersinia
An isolate of E.coli recovered from the stool of a patient with severe bloody diarrhea
should be tested for which sugar before sending it to a reference laboratory for
serotyping? - ✔✔Sorbitol (fermentation)
Care must be taken when identifying biochemical isolates of Shigella because serological
cross reactions occur with: - ✔✔E. coli
Which species of Shigella is most commonly associated with diarrheal disease in the
united states? - ✔✔S. sonnei
, Which of the following tests best differentiates Shigella species from E. coli? -
✔✔Lactose, indole, ONPG, and motility (Shigella is negative for all)
Which genera of Enterobacteriaceae ae usually nonmotile at 36C? - ✔✔Shigella,
Klebsiella, and Yersinia
Fever, abdominal cramping, watery stools, and fluid and elecrolyte loss preceded by
bloody stools 2-3 days before is characteristic of shigellosis, but may also result from
infection with: - ✔✔Campylobacter spp.
Cold enrichment of feces (incubation at 4C) in phosphate-buffered saline prior to
subculture onto enteric media enhances the recovery of: - ✔✔Yersinia enterocolitica
Which group of tests, along with colonial morphology on primary media, aids most in
the rapid identification of the Enterobacteriaceae? - ✔✔Indole, oxidase, MacConkey,
and Blood agar plates
A routine, complete stool culture procedure should include media for the isolation of E.
coli O157:H7 as well as: - ✔✔Salmonella, Shigella, Yersinia, Campylobacter and
Staphylococcus aureus.
Which group of tests best identifies the Morganella and Proteus genera? -
✔✔Motility, urease, and phenylalanine deaminase
Which group of test best differentiates Enterobacter aerogenes from Edwardsiella
tarda? - ✔✔Hydrogen sulfide(H2S) production, sucrose fermentation, indole, and VP.
