1.
What reagent is used in the oxidase test?
a)
Tetramethyl-p-phenylenediamine dihydrochloride
b)
Methyl red
c)
Kovac's reagent
d)
Urea broth
Answer:
a
2.
A positive catalase test indicates the presence
of:
a)
Hydrogen peroxide
b)
Catalase enzyme
c)
Indole
d)
Nitrate
Answer:
b
3.
Which bacterium is likely to produce a positive
coagulase test result?
a)
Escherichia coli
b)
Staphylococcus aureus
c)
Streptococcus pyogenes
d)
Pseudomonas aeruginosa
Answer:
b
4.
A positive Voges-Proskauer (VP) test result is
indicated by:
a)
Pink/red color change
b)
Blue color change
c)
Yellow color change
d)
No color change
Answer:
a
5.
Which reagent is used in the urease test?
a)
Urea broth
b)
Zinc
c)
Methyl red indicator
d)
Simmons citrate agar
Answer:
a
6.
A bacterium that produces a blue color change in
Simmons citrate agar is:
a)
Citrate-positive
b)
Citrate-negative
c)
Lactose fermenter
d)
Urease-positive
Answer:
a
7.
Which of the following organisms is likely to
yield a positive nitrate reduction test result?
a)
Escherichia coli
b)
Staphylococcus aureus
c)
Pseudomonas aeruginosa
d)
Streptococcus pyogenes
Answer:
a
8.
A bacterium that ferments glucose and lactose
but not sucrose will yield which TSI test result?
a)
Red slant/yellow butt
b)
Yellow slant/red butt
c)
Red slant/red butt
d)
Yellow slant/yellow butt
Answer:
b
9.
Which reagent is used to detect the production
of acids in the Methyl Red (MR) test?
a)
Methyl red indicator
b)
VP reagents A and B
c)
Simmons citrate agar
d)
Nitrate reagents A and B
Answer:
a
10.
The oxidase test is useful for differentiating
between:
a)
Staphylococcus and Streptococcus
b)
Enterobacteriaceae and Pseudomonas
c)
Gram-positive and Gram-negative bacteria
d)
Bacillus and Clostridium
Answer:
b
11.
Which reagent is used in the nitrate reduction
test?
a)
Methyl red indicator
b)
Tetramethyl-p-phenylenediamine dihydrochloride
c)
VP reagents A and B
d)
Kovac's reagent
Answer:
b
12.
A positive indole test result indicates the
presence of:
a)
Hydrogen peroxide
b)
Indole
c)
Nitrate
d)
Catalase enzyme
Answer:
b
13.
The Voges-Proskauer (VP) test detects the
production of:
a)
Acids
b)
Butanediol
c)
Ammonia
d)
Hydrogen sulfide
Answer:
b
14.
Which bacterium is known for producing green
pigment on agar and is associated with infections in burn patients?
a)
Escherichia coli
b)
Pseudomonas aeruginosa
c)
Staphylococcus aureus
d)
Klebsiella pneumoniae
Answer:
b
15.
A positive urease test result is indicated by:
a)
A pink/red color change
b)
Gas production
c)
A yellow color change
d)
A green color change
Answer:
b
16.
Which of the following bacteria is most likely
to yield a positive citrate utilization test result?
a)
Escherichia coli
b)
Salmonella enterica
c)
Streptococcus pneumoniae
d)
Neisseria gonorrhoeae
Answer:
b
17.
The Methyl Red (MR) test detects the production
of:
a)
Acids
b)
Alkaline products
c)
Ammonia
d)
Indole
Answer:
a
18.
A bacterium that produces gas from glucose
fermentation and hydrogen sulfide from sulfur reduction will yield which TSI
test result?
a)
Red slant/yellow butt
b)
Yellow slant/red butt
c)
Yellow slant/yellow butt
d)
Red slant/red butt
Answer:
b
19.
Which of the following organisms is likely to
produce a positive citrate utilization test result?
a)
Escherichia coli
b)
Pseudomonas aeruginosa
c)
Streptococcus pyogenes
d)
Staphylococcus aureus
Answer:
b
20.
The oxidase test is useful for differentiating
between:
a)
Staphylococcus and Streptococcus
b)
Enterobacteriaceae and Pseudomonas
c)
Gram-positive and Gram-negative bacteria
d)
Bacillus and Clostridium
Answer:
b
21. Differential
Diagnosis:
22.
A Gram-negative, oxidase-positive, non-lactose
fermenter that produces a fruity odor and green pigment on agar likely belongs
to which genus?
a)
Escherichia
b)
Klebsiella
c)
Pseudomonas
d)
Enterobacter
Answer:
c
23.
A catalase-positive, coagulase-negative coccus
that is novobiocin-resistant is likely:
a)
Staphylococcus aureus
b)
Staphylococcus epidermidis
c)
Streptococcus pyogenes
d)
Streptococcus pneumoniae
Answer:
b
24.
Which bacterium produces indole, is lysine and
ornithine decarboxylase positive, and has a "brick red" pigment on
MacConkey agar?
a)
Escherichia coli
b)
Klebsiella pneumoniae
c)
Proteus mirabilis
d)
Salmonella enterica
Answer:
c
25.
A bacterium that is citrate-negative, ferments
glucose, and produces gas from lactose fermentation likely belongs to which
genus?
a)
Klebsiella
b)
Proteus
c)
Salmonella
d)
Enterobacter
Answer:
a
26.
A Gram-negative bacterium that ferments lactose
with gas production, produces H2S, and is indole-negative is likely:
a)
Escherichia coli
b)
Proteus mirabilis
c)
Salmonella enterica
d)
Shigella flexneri
Answer:
c
27.
Which of the following bacteria is known for
producing a "blue-green" pigment on agar and can cause urinary tract
infections?
a)
Escherichia coli
b)
Pseudomonas aeruginosa
c)
Klebsiella pneumoniae
d)
Staphylococcus aureus
Answer:
b
28.
A Gram-positive coccus that grows in chains and
is beta-hemolytic on blood agar likely belongs to which species?
a)
Staphylococcus aureus
b)
Streptococcus pyogenes
c)
Staphylococcus epidermidis
d)
Streptococcus pneumoniae
Answer:
b
29.
A bacterium that produces H2S and causes a green
metallic sheen on EMB agar is likely:
a)
Escherichia coli
b)
Proteus mirabilis
c)
Salmonella enterica
d)
Shigella flexneri
Answer:
b
30.
A Gram-positive coccus that is
catalase-negative, optochin-sensitive, and causes pneumonia is likely:
a)
Streptococcus pyogenes
b)
Streptococcus agalactiae
c)
Staphylococcus aureus
d)
Streptococcus pneumoniae
Answer:
d
31.
Which of the following organisms is associated
with "rice-water" stools and can cause severe diarrhea and
dehydration?
a)
Escherichia coli
b)
Vibrio cholerae
c)
Shigella flexneri
d)
Campylobacter jejuni
Answer:
b
32.
A bacterium that is positive for the indole
test, negative for citrate utilization, and causes urinary tract infections is
likely:
a)
Escherichia coli
b)
Staphylococcus aureus
c)
Streptococcus pyogenes
d)
Pseudomonas aeruginosa
Answer:
a
33.
A catalase-positive, beta-hemolytic coccus that
is bacitracin-resistant and causes pneumonia is likely:
a)
Staphylococcus aureus
b)
Streptococcus pyogenes
c)
Staphylococcus epidermidis
d)
Streptococcus pneumoniae
Answer:
d
34.
Which of the following organisms is known for
producing a "chocolate" odor and causing respiratory tract infections
in cystic fibrosis patients?
a)
Staphylococcus aureus
b)
Pseudomonas aeruginosa
c)
Haemophilus influenzae
d)
Escherichia coli
Answer:
b
35.
A bacterium that is oxidase-positive, ferments
glucose, and produces a green pigment on agar is likely:
a)
Staphylococcus aureus
b)
Escherichia coli
c)
Pseudomonas aeruginosa
d)
Streptococcus pyogenes
Answer:
c
36.
A Gram-positive coccus that is
catalase-negative, coagulase-negative, and causes infections in prosthetic
devices is likely:
a)
Staphylococcus aureus
b)
Staphylococcus epidermidis
c)
Streptococcus pyogenes
d)
Streptococcus pneumoniae
Answer:
b
37.
A bacterium that produces a pink/red color
change in Simmons citrate agar is likely:
a)
Citrate-positive
b)
Citrate-negative
c)
Lactose fermenter
d)
Urease-positive
Answer:
a
38.
Which of the following organisms is associated
with a red "bull's-eye" rash, joint pain, and is transmitted by
ticks?
a)
Borrelia burgdorferi
b)
Treponema pallidum
c)
Neisseria gonorrhoeae
d)
Haemophilus influenzae
Answer:
a
39.
A bacterium that is urease-positive, produces a
fruity odor, and is associated with urinary tract infections is:
a)
Escherichia coli
b)
Proteus mirabilis
c)
Pseudomonas aeruginosa
d)
Staphylococcus aureus
Answer:
b
40.
A Gram-negative, oxidase-positive, curved
bacterium that causes bloody diarrhea and is associated with contaminated water
is:
a)
Escherichia coli
b)
Salmonella enterica
c)
Shigella flexneri
d)
Vibrio cholerae
Answer:
d
41.
A bacterium that is beta-hemolytic,
bacitracin-sensitive, and causes "flesh-eating" infections is likely:
a)
Staphylococcus aureus
b)
Streptococcus pyogenes
c)
Staphylococcus epidermidis
d)
Streptococcus pneumoniae
Answer:
b
42.
A bacterium that causes food poisoning due to
pre-formed toxin and is associated with reheated rice is:
a)
Staphylococcus aureus
b)
Bacillus cereus
c)
Clostridium perfringens
d)
Escherichia coli
Answer:
b
43.
Which of the following organisms is associated
with "honey-crusted" lesions and is common in children?
a)
Staphylococcus aureus
b)
Streptococcus pyogenes
c)
Corynebacterium diphtheriae
d)
Mycobacterium tuberculosis
Answer:
c
44.
A bacterium that is oxidase-negative, causes
urinary tract infections, and forms pink colonies on MacConkey agar is likely:
a)
Escherichia coli
b)
Pseudomonas aeruginosa
c)
Klebsiella pneumoniae
d)
Staphylococcus aureus
Answer:
a
45.
A Gram-negative bacterium that is
oxidase-positive, motile, and causes "swarming" on agar is likely:
a)
Escherichia coli
b)
Klebsiella pneumoniae
c)
Proteus mirabilis
d)
Shigella flexneri
Answer:
c
46.
A bacterium that is beta-hemolytic,
bacitracin-sensitive, and causes pharyngitis in children is likely:
a)
Staphylococcus aureus
b)
Streptococcus pyogenes
c)
Staphylococcus epidermidis
d)
Streptococcus pneumoniae
Answer:
b
47.
Which of the following organisms is associated
with "rusty" sputum and is a common cause of community-acquired
pneumonia?
a)
Mycobacterium tuberculosis
b)
Streptococcus pneumoniae
c)
Haemophilus influenzae
d)
Legionella pneumophila
Answer:
b
48.
A Gram-positive, spore-forming bacterium that is
motile and causes diarrhea is likely:
a)
Bacillus cereus
b)
Clostridium difficile
c)
Clostridium perfringens
d)
Clostridium tetani
Answer:
a
49.
A bacterium that is catalase-negative,
alpha-hemolytic, optochin-sensitive, and bile soluble likely belongs to which
species?
a)
Streptococcus pyogenes
b)
Streptococcus agalactiae
c)
Staphylococcus aureus
d)
Streptococcus pneumoniae
Answer:
d
50.
Which of the following organisms is associated
with "pseudomembranous" colitis and overgrowth due to antibiotic use?
a)
Clostridium difficile
b)
Clostridium perfringens
c)
Corynebacterium diphtheriae
d)
Mycobacterium tuberculosis
Answer:
a
51.
A Gram-negative, oxidase-positive, rod-shaped
bacterium that causes a sexually transmitted infection and is associated with
"strawberry cervix" is:
a)
Neisseria gonorrhoeae
b)
Chlamydia trachomatis
c)
Treponema pallidum
d)
Haemophilus ducreyi
Answer:
a