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Microbiology Certification Exam Practice Questions and Answers (100% Pass)
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©PREP4EXAMS @2024 [REAL EXAM DUMPS] Wednesday, July 17, 2024 1:27 AMMicrobiology Certification Exam Practice
Questions and Answers (100% Pass)
Diagnosis of typhoid fever during the first two days of illness can be confirmed best by: -
✔️✔️Blood culture
n anaerobic gram-negative bacillus isolated from a blood culture following bowel surgery
grew smooth, white, nonhemolytic colonies. A Gram stain showed a pale, BIPOLAR
STAINING ROD WITH ROUNDED ENDS. BILE stimulated GROWTH of the organism
and CATALASE was produced. The isolate was NOT INHIBITED by COLISTON,
KANAMYCIN, or VANCOMYCIN; indole was not produced. The most likely identification
of this isolate is: - ✔️✔️Bactemities fragilis
Which characteristic best differentiates Acinetobacter species from Moraxella species? -
✔️✔️indolephenol oxidase
SPS is used as an anticoagulant for blood cultures because it: - ✔️✔️inactivates neutrophils
and complement components
Recent evidence has shown that specimens to be inoculated for the recovery of acid-fast
bacilli should be centrifuged at approximately: - ✔️✔️3500g
A culture from an infected dog bite on a small boy's finger yielded a small, gram-negative
COCCObacillus that was smooth, raised, and BETA HEMOLYTIC on blood agar. The isolate
was found to grow readily on MacConkey agar forming colorless colonies. The organism
was motile with PERITRICHOUS flagella, CATALASE positive, OXIDASE positive,
reduced nitrate, utilized citrate, and was UREASE positive within 4 hours. NO
CARBOHYDRATES were fermented. The most likely identification of this isolate is: -
✔️✔️Bordetella bronchiseptica
Differential skin testing for mycobacteriosis has diagnostic value in young children because:
- ✔️✔️not yet sensitized to many mycobacteria
Which one of the following organisms could be used as the positive quality control test for
lecithinase on egg yolk agar? - ✔️✔️C. perfringens
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, ©PREP4EXAMS @2024 [REAL EXAM DUMPS] Wednesday, July 17, 2024 1:27 AM
A Campylobacter species has been isolated from a blood culture. The organism is susceptible
to nalidixic acid and resistant to cephalothin. Which of the following tests would aid in the
differentation between Campylobacter jejuni and Campylobacter coli? - ✔️✔️hippyrate
Pseudomembranouscolitis caused by Clostridium difficile toxin is BEST confirmed by which
of the laboratory findings? - ✔️✔️presence of toxin in stool
An aspirate of a deep wound was plated on blood agar plates aerobically and anaerobically.
At 24 hours there was growth on the anaerobic plate only. The next step in the evaluation of
this culture is to: - ✔️✔️Begin ID
The porphyrin test was devised to detect strains of Haemophilus capable of: - ✔️✔️synthesis
of porphobilinogen
During the past month, Staphylococcus epidermidis has been isolated from blood cultures at
two to three times the rate from the previous year. The most logical explanation for the
increase in these isolates is that: - ✔️✔️break in proper skin prep
"Nutritionally deficient" streptococci are: - ✔️✔️strep viridans
A specimen of hair that fluoresced under a Wood's lamp was obtained from a child with low-
grade scaling lesions of the scalp. Cultures revealed a fungus with mycelium and VERY
FEW MACROCONIDIA or MICROCONIDIA. This fungus is most likely: -
✔️✔️microsporum audunii
The stock cultures needed for quality control testing of motility are: - ✔️✔️K. pneumoniae/ E.
coli
Infection rate is highest for laboratory professionals exposed to blood and body fluids
containing: - ✔️✔️Hep B
The preferred carbon source for mycobactena is: - ✔️✔️Glycerol
After proficiency in performing disk diffusion susceptibility tests is demonstrated, the
frequency of quality control can be reduced from daily to: - ✔️✔️every week
The stock cultures needed for quality control testing of oxidase production are: - ✔️✔️E. coli/
P. aeurginosa
Most of the automated microbiology equipment currently available has been designed to
replace: - ✔️✔️repetitive manual methods preformed daily on a large number of specimens
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, ©PREP4EXAMS @2024 [REAL EXAM DUMPS] Wednesday, July 17, 2024 1:27 AM
The ONPG test allows organisms to be classified as a lactose fermenter by testing for which
of the following? - ✔️✔️beta-galactosidase
Optimum growth of Campylobacter jejuni is obtained on suitable media incubated at 42oC in
an atmosphere containing: - ✔️✔️6% O2, 10-15% CO2, rest N2
In the optochin (ethyihydrocupreine hydrochloride) susceptibility test, if there is a zone of
inhibition of 19 to 30 mm surrounding the disk following overnight incubation at 37°C, the
colony most likely consists of: - ✔️✔️pneumococci
A 27-year-old scuba diver has an abrasion on his left thigh. A culture of this wound grew an
acid-fast organism at 30°C. This isolate most likely is Mycobacterium: - ✔️✔️marinum
An organism was isolated on kanamycin-vancomycin agar from a peritoneal abscess. The
genus of this organism most likely is - ✔️✔️Bacteriodies
The reverse CAMP test, lecithinase production, double zone hemolysis, and Gram stain
morphology are all useful criteria in the identification of: - ✔️✔️C. perfringens
Which of the following organisms must be incubated in a microaerophilic environment for
optimal recovery of the organism? - ✔️✔️CAMPYLOBACTER fetus
Nonmetallic surfaces contaminated with blood should be disinfected with: - ✔️✔️5% bleach
Photochromogens produce pigment when: - ✔️✔️exposed to light for 1 hour
Staib's medium (Niger seed agar) is useful in the identification of which of the following? -
✔️✔️C. neoformans
Susceptibility testing performed on quality control organisms using a new media lot number
yielded zone sizes that were too large for all antibiotics tested. The testing was repeated using
media from a previously used lot number, and all zone sizes were acceptable. Which of the
following best explains the unacceptable zone sizes? - ✔️✔️media too thin
Production of beta-lactamase is inducible in which of the following? - ✔️✔️S. aureus
The organism most commonly associated with neonatal purulent meningitis is: - ✔️✔️GBBHS
With few exceptions, all members of the family Enterobacteriaceae show which of the
following characteristics? - ✔️✔️Reduce nitrate
The most reliable serologic test for the diagnosis of Q fever is the: - ✔️✔️complement fixation
test
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