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Bacteriology I
Bacteriology II
Mixed Bag
Mycology
Parasitology
100
This type of streptolysin is produced by group A streptococcus and creates beta-hemolysis on sheep blood agar. a. Streptolysin H b. Streptolysin M c. Streptolysin O d. Streptolysin S
What is Streptolysin S.
100
Which of the following species of Bacillus is nonmotile? A. B. cereus B. B. subtilis C. B. anthracis D. B. thuringiensis
What is Bacillus anthracis
100
Infection of the gastric mucosa leading to gastritis or peptic ulcers is most commonly associated with A. Campylobacter jejuni B. Helicobacter pylori C. Salmonella Typhi D. Shigella sonnei
What is helicobacter pylori
100
This is the organism that causes tinea nigra. A. Hortaea werneckii B. Trichosporon sp. C. Piedraia hortae D. Fonsecaea compacta
What is Hortaea werneckii
100
Elephantitis is a complication associated with which of the following? A. Cysticercosis B. Guinea worm C. Hydatid cyst disease D. Filariae
What is Filariae.
200
Enterococcus faecium is characteristically: a. Inhibited by the presence of bile in culture media b. Able to grow in the presence of high concentrations of salt c. PYR negative d. Beta-hemolytic
What is able to grow in the presence of high concentrations of salt
200
The most common etiologic agent of infections assoicated with the surgical insertion of prosthetic devices such as artificial heart valves and cerebrospinal fluid shunts is: A. Corynebacterium urealyticum B. Staphylococcus capitis C. Staphylococcus epidermidis D. Streptococcus mutans
What is Staphylococcus epidermidis
200
An example of a halophilic micro-organism is: A. Morganella morganii B. Plesiomonas shigelloides C. Vibrio parahaemolyticus D. Yersinia pestis
What is Vibrio parahaemolyticus
200
The most useful finding for prompt, presumptive identification of C. albicans is its: A. failure to assimilate sucrose B. "Feathering" on EMB C. Production of chlamydospores D. Production of germ tubes
What is production of germ tubes
200
Cysts of Giardia lamblia: A. contain 4 nuclei B. are motile by flagella C. have an undulating membrane D. are rarely found in stool specimens
What is they contain 4 nuclei.
300
A gram stain of a sputum specimen from a patient with a suspected case of lobar pneumonia reveals many WBCs and many gram-positive cocci (primarily diplococci). Which statement would be appropriate, given these results? A. A PYR test should be performed on the culture isolate B. An ELEK test should be performed on the culture isolate C. An optochin test should be performed on the culture isolate D. A hippurate hydrolysis test should be performed on the culture isolate
What is an optochin test should be performed
300
A catalase-negative gram-positive coccus is isolated from a urine sample of a hospitalized patient. The bacterium produced a black pigment on bile-esculin agar and formed acid from glucose in the presence of 6.5% CaCl. What is the most likely identification of this bacteria? A. Abiotophia sp. B. Enterococcus faecalis C. Group B streptococci D. Group D streptococci
What is Enterococcus faecalis
300
A gram-negative bacillus was recovered from a urine of a child with a history of recurrent urinary tract infections. The organism was oxidase negative, lactose negative, urease positive, and motile. The most likely identification of the agent would be: A. Escherichia coli B. Klebsiella pneumonniae C. Proteus mirabilis C. Pseudomonas aeruginosa
What is Proteus mirabilis
300
This stain greatly enhances the visibility of fungi by binding to the cell walss, causin the fungi to fluoresce blue-white or apple green.
What is Calcofluor white.
300
A Giemsa-stained thick blood film showed many ring forms with no older stages, and a number of the rings had double chromatin dots. These findings are characteristic of this organism.
What is Plasmodium falciparum.
400
A number of vacationers who have traveled outside the U.S. have had their vacations interrupted by a case of traveler's diarrhea which is commonly associated with which etiologic agent? A. Aeromonas hydrophilia B. Escherichia coli C. Proteus mirabilis D. Vibrio parahemolyticus
What is enteropathogenic Eschericia coli
400
An anaerobically incubated blood agar plate shows colonies surrounded by an inner zone of complete red cell lysis and an outer zone of incomplete cell lysis (double zone of hemolysis). The most likely presumptive identification of this isolate would be:
What is Clostridium perfringens
400
This Mycobacterium is most noted for being associated with patients suffering from AIDS.
What is M. avium-intracellularae complex
400
Observation of dematiaceous hyphae is an early clue in the identification of common, airborne fungi. Which of the following genera contains species found as dematiaceous contaminants? A. Alternaria B. Aspergillus C. Fusarium D. Penicillium
What is Alternaria.
400
This amebic cyst has an average size of 6-8um and is usually spherical. When mature, it has 4 nuclei, but immature cysts with 1 or 2 nuclei are often seen. The nuclei have fine uniform granules of pheripheral chromatin and small, discrete, usually central karyosomes. Chromatoidal bars with bluntly rounded ends are sometimes present. A. Endolimax nana B. Entamoeba coli C. Entamoeba hartmanni D. Entamoeba histolytica
What is Entamoeba hartmanni.
500
Obligately anaerobic, gram-negative bacilli, recovered from an abdominal wound, were found to be resistant to penicillin. Growth of this organism was not inhibited by bile. What is the most likely identification of this isolate? A. Bacteroides fragilis group B. Clostridium septicum C. Eubacterium lentum D. Fusobacterium nucleatum
What is Bacteroides fragilis.
500
This Clostridium sp. is most commonly recovered from cases of gas gangrene.
What is Clostridium perfringens
500
Colonies said to have the appearance of a "fried egg" are characteristic of this organism.
What is Mycoplasma hominis
500
It is usually difficult or impossible to identify a fungal culture before it is mature. However, hyaline, septate hyphae, and a young conidiophore with a foot cell and a swollen vesicle are excellent clues to the identification of this organism.
What is Aspergillus.
500
This parasitic infection may result in vitamin B12 deficiency, and individuals with pernicious anemia are predisposed to more severe symptoms. A. Diphyllobothrium latum B. Echinococcus granulosus C. Hymenolepis diminuta D. Taenia saginata
What is D. latum.