POPCORN Flashcards
Which of the following viruses is implicated along with Epstein–Barr virus as a cause of infectious mononucleosis?
A. Cytomegalovirus (CMV)
B. Coxsackie A virus
C. Coxsackie B virus
D. Hepatitis B virus
A
POPCORN
Kaposi sarcoma is associated with infection by:
A. Adenovirus
B. Cytomegalovirus
C. Hepatitis E virus
D. Human herpes virus 8
D
POPCORN
An immunocompromised patient was admitted to the hospital with a diagnosis of HEMORRHAGIC CYSTITIS. Which combination of virus and specimen would be most appropriate to diagnose a viral cause of this disorder?
A. BK virus—urine
B. Human papilloma virus—skin
C. Hepatitis B virus—serum
D. Epstein–Barr virus—serum
A
POPCORN
The causative agent of plague is most often transmitted to humans by:
A. Fleas
B. Mosquitos
C. Dog bites
D. Inhalation
A
POPCORN
A commercial fisherman with red sores on his hands was seen by his physician. Biopsy and culture of one of the lesions grew an organism with the characteristics listedD below:
Nonhemolytic on SBA
Gram-positive bacilli, no spores observed
Catalase negative
Hydrogen sulfide production positive
Growth in gelatin resembled a test-tube brush
What is the most likely identification?
A. Rhodococcus equi
B. Listeria monocytogenes
C. Lactobacillus acidophilus
D. Erysipelothrix rhusiopathiae
D
POPCORN
A newborn female becomes febrile and will not feed for aboutan hour after birth. A gram-positive rod is recovered from blood cultures from the newborn. The isolate has the characteristics listed below:
Weakly β-hemolytic on SBA
Gram-positive bacilli, no spores observed
Catalase positive
Hydrogen sulfide negative
Motile at room temperature
What is the most likely identity of the isolate?
A. Erysipelothrix rhusiopathiae
B. Listeria monocytogenes
C. Corynebacterium ureilyticum
D. Gardnerella vaginalis
B
POPCORN
Extended-spectrum beta-lactamases (ESBLs)
ESBL-producing isolates should be considered resistant to which of the following agents?
A. Cephalosporins, penicillins, and aztreonam
B. Cephalosporins, penicillins, and aminoglycosides
C. Cephalosporins, penicillins, and β-lactamase inhibitors
D. Penicillins and aminoglycosides
A
POPCORN
Which of the listed antimicrobials act on cell wall biosynthesis?
A. β-Lactams and glycopeptides
B. Tetracycline and streptomycin
C. Macrolides and phenicols
D. Fluoroquinolone and sulfamethoxazole
A
POPCORN
Tryptophan broth is inoculated and incubated 24 hours. After incubation, Kovac’s reagent is added. A red color develops at the surface of the broth. What product of metabolism was formed?
A. Mixed acids
B. Malonate
C. Phenylpyruvate
D. Indole
D
POPCORN
1. Which of the following tests detects the production of mixed acids as a result of subsequent metabolism of pyruvate?
A. Methyl red test
B. Voges-Proskauer test
C. Citrate test
D. Indole test
2. The metabolism of glucose to pyruvate by members of the family Enterobacteriaceae is via the Embden-Meyerhof “Parnas” (EMP) pathway. The subsequent metabolism of pyruvate shows this reaction: Glucose → Pyruvate → Acetylmethylcarbinol (acetoin) → 2,3-Butanediol. This reaction is the basis for the:
A. Oxidase reaction
B. Methyl red test
C. Indole test
D. Voges-Proskauer test
A
D
POPCORN
Calcofluor white is a colorless dye that binds with which of the following structures?
A. Cell wall containing mycolic acid
B. Chitin
C. Peptidoglycan layer
D. Metachromatic granules
B
