Microbiology CSMLS Review Questions
A causative agent of the form of conjunctivitis known as pinkeye is
- Haemophilus aegyptius
- Moraxella lacunata
- Chlamydia trachomatis
- Klebsiella ozaenae - correct answer-Haemophilus aegyptius
A common member of the normal flora of the upper respiratory tract is
- Corynebacterium jeikeium
- Lactobacillus
- Staphylococcus epidermidis
- Viridans streptococcus - correct answer-Viridans streptococcus
(They are the most common NF in upper respiratory cultures and are opportunistic
pathogens)
A culture of an ulcer grew a gram-negative fac. bacillus. On TSI it produced A/A w/ gas. Test
reactions were: Citrate negative, indole positive, urease negative, ONPG positive.
- Enterobacter cloacae
- E.coli
- Citrobacter koseri
- Providencia stuartii - correct answer-E.coli
A gram positive coccus that is catalase positive, nonmotile, lysostaphin resistant, and
modified oxidase positive is best identified as
- Micrococcus
- Lactococcus
- Streptococcus
- Staphylococcus - correct answer-Micrococcus
(Staphylococci and Micrococci are both Catalase positive. Micrococci are oxidase positive,
whereas staphylococci are negative)
A gram stain of sputum from a patient with suspected pneumonia reveals many WBC and
many G+ cocci, which are primarily diplococci
Which statement would be an appropriate next step
- A PYR test
- An Elek test
- An optochin test
- Hippurate hydrolysis test - correct answer-An optochin test
(Optochin lysis pneumococci, producing a zone of inhibition around the disk)
A gram-negative, "kidney bean" cellular morphology is a distinguishing characteristic of
- Neisseria meningitidis
- Yersinia pestis
- Bartonella spp.
- Actinobacter spp. - correct answer-Neisseria meningitidis
, A negative citrate reaction is characteristic of
- Citrobacter freundii
- Enterobacter aerogenes
- Serratia marcescens
- Shigella boydii - correct answer-Shigella boydii
(Citrate utilization is a common test used for the differentiation of members of the family
Enterobacteriaceae. Both E.coli and Shigella boydii are incapable of using citrate)
A patient that had an aspirate done, grew an aerobic, filamentous, branching gram-positive
organism, which stained weakly acid-fast. The most likely etiologic agent would be?
- Actinomyces israelii
- Nocardia asteroides
- Mycobacterium tuberculosis
- Propionibacterium acnes - correct answer-Nocardia asteroides
(When streaked on DNase test medium, colonies of S. aureus and Serratia marcescens will
demonstrate a positive reaction)
A test for the hydrolysis of esculin in the presence of bile is especially useful in identifying
species of the genus
- Abiotrophia
- Corynebacterium
- Enterococcus
- Staphylococcus - correct answer-Enterococcus
(Enterococcus and other Group D strep can be identified based on their ability to hydrolyze
esculin)
A urine culture from a 23 year old female grew a catalase-positive, gram-positive (>100,000
cfu/ml) which would most likely seen
- Staphylococcus saprophyticus
- Enterococcus faecalis
- Streptococcus pyogenes
- Streptococcus viridans - correct answer-Staphylococcus saprophyticus
(Staph saprophyticus infections are common complications in females)
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