Microbiology BOC Exam Review
Questions 100% Solved Correctly.
An organism was inoculated to a TSI tube and gave the following reactions:
alkaline slant/acid butt, H2S gas produced
a. Kleb pneumo
b. Shigella dysenteriae
c. Salmonella typhurium
d. E. coli - Answer C
A TSI tube inoculated with an organism gave the following reactions:
alkaline slant/acid butt, no h2s, no gas
a.Yersinia enterolicolitica
b. Salmonella typhi
c. Salmonella enteritidis
d. Shigella dysenteriae - Answer D
The stock culture needed for quality control testing of oxidase production are:
a. E. coli/K. pneumo
b. S. typhimurium/E. coli
c. E. coli/ P. aeruginosa
d. P. mirabilis/E. coli - Answer C
Which characteristic best differentiates Acinetobacter species from Moraxella species?
a. production of indophenol oxidase
b. growth on MacConkey agar
,c. motility
d. susceptibility to penicillin - Answer A
The india ink stain is used as a presumptive test for the presence of which organism?
a. Aspergillus niger in blood
b. Cryptococcus neoformans in CSF
c. Histoplasma capsulatum in CSF
d. Candida albicans in blood or body fluids - Answer B
Which Aspergillus species, recovered from a sputum or bronchial mucus, is the most common cause of
pulmonary aspergillosis?
a. A. niger
b. A. flavus
c. A. gumigatus
d. all of these options - Answer C
A gram stain is performed on a sputum specimen reavealed gram negative dipplococci within PMNs.
Oxidase testing is postive and carbohyrate degradation tests are inhert. The organism is:
a. Neisseria lactamica
b. Moraxella catarrhalis
c. neisseria meningitidis
d. neisseria sicca - Answer B
Definitive identification of Neisseria gonorrhoeae is made with the:
a. gram stain
b. oxidase test
c. degradation of amino acids
d. hydrolysis of carbohydrates - Answer D
, An organism previously thought to be non pathogenic, Moraxella catarrhalis, is now known to be
associated with ooportunistic respitory infection and nosocomial transmission. Characteristic
identification criteria include:
a. oxidase negative
b. carbohydrates negative
c. beta-lactamase negative
d. gram-negative bacilli - Answer B
A gram stain of organisms on Loeffler agar showed pleomorphic gram-postive bacilli. The organism
should be subculctured to:
a. blood
b. chocolate
c. MacConkey
d. potassium tellurite - Answer D
Which organism commonly causes food poisoning by consumption of food containing excessive
populations of organisms or performed exotoxins?
a. Salmonella eneritidis
b. Shigella sonnei
c. Bacillus cereus
d. E. coli - Answer C
Establishing the pathogenicity of a microorganism isolated from a child's thraot and identified as
Corynebacterium diphtheria would depend upond:
a. the morphological appearance on the gram stain
b. the type of hemolysis on blood agar
c. a postive toxigenicity test
d. the appearance of growth on Tinsdalse tellurite agar - Answer C
Which feature distinguishes Erysipelothrix rhusiopathiae from other clinically significant non spore
forming, gram postive, faculatively anaerobic bacilli?
Questions 100% Solved Correctly.
An organism was inoculated to a TSI tube and gave the following reactions:
alkaline slant/acid butt, H2S gas produced
a. Kleb pneumo
b. Shigella dysenteriae
c. Salmonella typhurium
d. E. coli - Answer C
A TSI tube inoculated with an organism gave the following reactions:
alkaline slant/acid butt, no h2s, no gas
a.Yersinia enterolicolitica
b. Salmonella typhi
c. Salmonella enteritidis
d. Shigella dysenteriae - Answer D
The stock culture needed for quality control testing of oxidase production are:
a. E. coli/K. pneumo
b. S. typhimurium/E. coli
c. E. coli/ P. aeruginosa
d. P. mirabilis/E. coli - Answer C
Which characteristic best differentiates Acinetobacter species from Moraxella species?
a. production of indophenol oxidase
b. growth on MacConkey agar
,c. motility
d. susceptibility to penicillin - Answer A
The india ink stain is used as a presumptive test for the presence of which organism?
a. Aspergillus niger in blood
b. Cryptococcus neoformans in CSF
c. Histoplasma capsulatum in CSF
d. Candida albicans in blood or body fluids - Answer B
Which Aspergillus species, recovered from a sputum or bronchial mucus, is the most common cause of
pulmonary aspergillosis?
a. A. niger
b. A. flavus
c. A. gumigatus
d. all of these options - Answer C
A gram stain is performed on a sputum specimen reavealed gram negative dipplococci within PMNs.
Oxidase testing is postive and carbohyrate degradation tests are inhert. The organism is:
a. Neisseria lactamica
b. Moraxella catarrhalis
c. neisseria meningitidis
d. neisseria sicca - Answer B
Definitive identification of Neisseria gonorrhoeae is made with the:
a. gram stain
b. oxidase test
c. degradation of amino acids
d. hydrolysis of carbohydrates - Answer D
, An organism previously thought to be non pathogenic, Moraxella catarrhalis, is now known to be
associated with ooportunistic respitory infection and nosocomial transmission. Characteristic
identification criteria include:
a. oxidase negative
b. carbohydrates negative
c. beta-lactamase negative
d. gram-negative bacilli - Answer B
A gram stain of organisms on Loeffler agar showed pleomorphic gram-postive bacilli. The organism
should be subculctured to:
a. blood
b. chocolate
c. MacConkey
d. potassium tellurite - Answer D
Which organism commonly causes food poisoning by consumption of food containing excessive
populations of organisms or performed exotoxins?
a. Salmonella eneritidis
b. Shigella sonnei
c. Bacillus cereus
d. E. coli - Answer C
Establishing the pathogenicity of a microorganism isolated from a child's thraot and identified as
Corynebacterium diphtheria would depend upond:
a. the morphological appearance on the gram stain
b. the type of hemolysis on blood agar
c. a postive toxigenicity test
d. the appearance of growth on Tinsdalse tellurite agar - Answer C
Which feature distinguishes Erysipelothrix rhusiopathiae from other clinically significant non spore
forming, gram postive, faculatively anaerobic bacilli?
