LECTURE practice test Flashcards
True about the Elek test except:
I. a test strip of filter paper containing diphtheria antitoxin is placed in the center of the
agar plate
II. presence of precipitin lines considered positive of diphtheria toxin
III. Filter paper impregnated with diphtheria antitoxin placed perpendicular to bacterial
streaks
IV. test to detect the toxigenicity of Corynebacterium species
A. IV
B. I, III, IV
C. III
D. III, IV
A
Wool sorter’s disease is associated to
A. Pulmonary anthrax
B. Cutaneous anthrax
C. Gastrointestinal anthrax
D. Black eschar
A
A 2-year-old child was admitted to the hospital with acute meningitis. The Gram stain
revealed Gram-positive short rods, and the mother indicated that the child had received “all’
of the meningitis vaccinations. What is the most likely cause of the disease?
A. Neisseria meningitidis group A
B. Listeria monocytogenes
C. Neisseria meningitidis group C
D. Bacillus anthracis
E. Streptococcus pneumoniae
B
28-year-old menstruating woman appeared in the emergency room with the following signs and symptoms: fever, 104°F (40°C); VVBC, 16,000/uL; blood pressure, 90/65 mmHg a scarlatiniform rash on her trunk, palms, and soles: extreme fatigue, vomiting and diarrhea. The patient described in the case above most likely has
A. Staphylococcal food poisoning
B. Toxic shock syndrome
C. Scalded skin syndrome
D. Guillain-Barr syndrome
E. Chickenpox
B
which of the ff tests should be performed for initial differentiation of Listeria
monocytogenes from group B streptococci?
A. Gram stain, CAMP test, blackening at TSI
B. oxidase and bacitracin
C. Gram stain, motility at Room temp, catalase
D. Oxidase, CAMP test, glucose
C
Specimen for detection and diagnosis of diphtheria:
I. throat swab
II. nasopharyngeal swab
III. oropharyngeal swab
IV. bronchial aspirate
A. I, II, III, IV
B. I only
C. I, II, III
D. none of these
B
Which of the following characteristics best describe a gram-positive bacterium?
I. periplasmic: present
II. Periplasmic: absent
III. Outer membrane: present
IV. Outer membrane: absent
A. I, IV
B. II, IV
C. II, III
D. I, III
B
Drug of choice of the treatment of bacterial vaginosis
A. Erythromycin
B. Clindamycin
C. Penicillin
D. Metronidazole
D
Which of the following is catalase negative?
I. Bacillus subtilis Listeria monocytogenes
II. Corynebacterium ulcerans, Erysipelothrix rhusopathiae
III. Streptococcus agalactiae, Neisseria baciliformis
IV. Neisseria elongate, Lactobacillus acidophilus
A. II, III, IV
B. III
C. I, II
D. III, IV
D
Given the results what is the most likely microorganism identification?
Catalase = positive Oxidase= positive
DNAse = positive
Tributyrin hydrolysis = positive
Glucose = negative Sucrose = negative
Lactose = negative Maltose = negative
Fructose = negative
A. Neisseria sicca
B. Moraxella catarrhalis
C. Neisseria flavescens
D. Neisseria elongata
B
Which of the following is associated with infections in humans often linked to deli meats and improperly pasteurized dairy products?
A. Bacillus cereus
B. Leuconostoc
C. Streptococcus agalactiae
D. Listeria monocytogenes
D
An Old citizen club had their monthly picnic, half of them experienced onset of vomiting after 6 -8 hours of eating pre-heated food. The most likely bacterial cause of such symptom would be food poisoning caused by?
A. Bacillus anthracis
B. Staphylococcus aureus
C. Bacillus cereus
D. Listeria monocytogenes
C
Colonies of Listeria monocytogenes on Sheep Blood Agar plate closely resembles the
colonies of?
A. Streptococcus agalactiae
B. Streptococcus bovis
C. Sreptococcus pyogenes
D. Streptococcus equisimilis
A
Identify the organism with the following biochemical reactions: Gram positive cocci in pairs, Taxo P – resistant, Bile esculin test with blackening reaction, in 6.5% NaCl with presence of turbidity, catalase without bubbles formation, PYRase with red color at the disk and Bacitracin with no zone of inhibition.
A. Enterococcus
B. Group A Streptococci
C. Group D Non Enterococci
D. Group B Streptococci
A
In the CAMP test, a single streak of a beta-hemolytic Streptococcus is placed
perpendicular to a streak of beta-lysin producing Staphylococcus aureus. After the incubation, a zone of increased lysis in the shape of an arrowhead is noted, this indicates the presumptive identification of.
A. Group D enterococcus
B. Group B Beta-hemolytic streptococci
C. Group D Non-enterococcus
D. Group A Beta-hemolytic streptococci
B
Encapsulated microorganism:
I. Neisseria meningitidis
II. Listeria monocytogenes
III. Streptococcus pneumoniae
IV. Bacillus anthracis
A. I, II, III
B. II, III
C. I, II, IV
D. I, III, IV
D
Found in renal biopsy after the beta-hemolytic infection of:
A. Streptococcus pyogenes
B. Streptococcus agalactiae
C. Streptococcus pneumoniae
D. Staphylococcus aureus
A
Which of the anaerobic utilization of pyruvic acid was used by Gram positive cocci in
chains organism?
I. Mixed acid
II. Heterolactic
III. Homolactic
IV. Butyric Acid
A. II
B. I, IV
C. II, III
D. III
D
identify the organism with the following characteristics: Gram positive cocci, SXT-resistant, mucoid colony, Taxo A – 0mm , Taxo P - .17mm; Bile solubility: soluble; DNAse: no clearing
of colony; PYRase: colorless; CAMP: no arrow head formation; Hippurate hydrolysis: clear;
6.5 % Salt tolerance: cleared and Bile esculin: absence of blackening.
A. Streptococcus pneumoniae
B. Staphylococcus aureus
C. Streptococcus agalactiae
D. Streptococcus pyogenes
A
1st Statement: Erysipelothrix rhusiopathiae on blood agar plate with translucent, nonhemolytic and gray colonies
2nd Statement: Gardnerella vaginalis on blood agar plate with beta-hemolytic and pinpoint
colonies
A. 1st Statement is correct and 2nd Statement is incorrect
B. Neither of the Statements are correct
C. 2nd Statement is correct and 1st Statement is incorrect
D. Both Statements are correct.
B
Has intra and extracellular gram negative diplococci and test are as follows: small, flat, gray colonies on chocolate agar, oxidase positive, Cystine trypticase
agar (CTA) maltose positive: CTA lactose negative. The most likely identity that isolate is:
A. Neisseria gonorrhoeae
B. Neisseria meningitidis
C. Moraxella catarrhalis
D. Acinetobacter species
B
Clinical resistance to penicillin dosages appears to correlate with beta-lactamase
production in:
A. Streptococcus agalactiae
B. Neisseria gonorrhoeae
C. Streptococcus pyogenes
D. Neisseria meningitidis
B
Corynebacterium species recovered from a throat culture is considered a pathogen when it
produces:
A. pseudomembrane of the oropharynx
B. Tinsdale halo
C. an endotoxin
D. A & B
E. B & C
D
an organism that cannot use oxygen as the final electron acceptor and is inhibited by its
presence is a(an):
A. obligate anaerobe
B. microaerophilic
C. Facultative anaerobe
D. Obligate aerobe
A
The Vogues- Proskauer test detects the production of:
A. p-dimethylaminobenzaldehyde
B. Decarboxylase activity
C. Acetylmethylcarbinol
D. phenylalanine
C
Which of the following microorganism is most likely to be isolated in cultures from the
anterior nares of the healthcare workers?
A. Streptococcus pneumoniae
B. Staphylococcus saprophyticus
C. Staphylococcus aureus
D. Bacillus cereus
C
Which of the following statements are CORRECT, except?
I. All prokaryotes are unicellular and multicellular.
II. All eukaryotes are unicellular and multicellular.
III. Peptidoglycan is present at all prokaryotes
IV. Polysaccharides are present at eukaryotes
A. I only
B. II, III, IV
C. I, III
D. II, IV
C
Which of the following gram-negative diplococci causes endocarditis?
I. Neisseria sicca
II. Neisseria weaver
III. Neisseria bacilliformis
IV. Neisseria lactamica
A. I, IV
B. II, IV
C. II, III
D. I, III
D
RNA hybridization for probes specific for DNA sequences of Neisseria gonorrhoeae and
Chlamydia trachromatis.
A. AMPLICOR CT/NG
B. AccuProbe
C. Digene HC2
D. PACE 2
C
Identify which of the gram-positive bacilli have the microscopic and biochemical results.
Catalase: negative Hemolysis: gamma Glucose
fermentation: positive
SIM: Negative Urease: pink TSI: without
blackening
A. Gardnerella vaginalis
B. Rhodococcus species
C. Arcanobacterium haemolyticum
D. Rothia dentocariosa
A
A common member of the normal flora of the Upper Respiratory Tract is:
A. Staphylococcus epidermidis
B. Lactobacillus acidophilus
C. Viridans streptococcus
D. Corynebacterium jeikeium
C
Virulence factor causes severe type of skin localized infection.
I. Exotoxin A
II. Enterotoxin F
III. Epidermolytic toxin A
IV. Exopolysaccharide
A. I, III
B. III
C. I, III, IV
D. II, IV
A
Agar primarily used for the isolating Gram-positive cocci?
A. Mannitol Salt Agar Plate
B. Cystine Tellurite Blood Agar Plate
C. Thayer martin media
D. Columbia Colistin Nalidixic acid
A
