Delost Introduction to Diagnostic Microbiology Review
Questions With Complete Solutions
10. A patient's serum yields a positive RPR and a
negative
TPPA. These results most likely indicate:
a. Reactive for syphilis
b. False-negative FTA-absorbed from low sensitivity
of
the test
c. Biological false-positive RPR from cross-reacting
antibodies
d. Patient in remission for syphilis Correct Answers
10. Acinetobacter can be differentiated from
Neisseria by:
a. A positive oxidase reaction for Neisseria
b. Gram stain
c. Carbohydrate utilization patterns
d. Pigment production Correct Answers
10. An organism that cannot use oxygen as the
final
electron acceptor and is inhibited by its presence is
a(an):
a. Obligate aerobe
b. Obligate anaerobe
c. Facultative anaerobe
d. Microaerophile Correct Answers
,10. If a branching gram-positive bacillus with a
pleomorphic morphology is observed, which of the
following can be ruled out?
a. Listeria
b. Lactobacillus
c. Nocardia
d. Streptomyces Correct Answers
10. In the Gram stain technique, Gram's iodine
functions as
the:
a. Primary stain
b. Mordant
c. Decolorizer
d. Counterstain Correct Answers b. Mordant
10. Neisseria meningitidis can be carried , which
serves as a reservoir for infection.
a. in the nasopharynx
b. in the blood
c. in the oral cavity
d. on the skin Correct Answers a. in the
nasopharynx
10. Streptolysin O is:
a. Oxygen stable
b. Antigenic
c. Observed as surface hemolysis
d. All the above Correct Answers b. Antigenic
,10. The interaction between single-stranded
nucleic acid
molecules to form a double-stranded molecule is
known as:
a. Blotting
b. Hybridization
c. Denaturation
d. A DNA probe Correct Answers b. Hybridization
10. The iodine stain for identification of C.
trachomatis
stains:
a. The glycogen in the inclusion brown
b. The periplasmic space purple
c. The cell membrane brown
d. The DNA in the inclusion purple Correct Answers
10. The optimal wound specimen for culture of
anaerobic
organisms should be:
a. A swab of lesion obtained before administration
of
antibiotics
b. A swab of lesion obtained after administration of
antibiotics
c. A syringe filled with pus obtained before
administration of antibiotics
d. A syringe filled with pus obtained after
, administration of antibiotics Correct Answers c. A
syringe filled with pus obtained before
administration of antibiotics
10. The population most frequently infected by
H. influenzae is:
a. Newborns
b. Nonimmunized infants and children less than
3 years of age
c. Nonimmunized preschool-age children, ages 3 to
5 years
d. School-age children, ages 6 to 10 years
e. Immunosuppressed adults Correct Answers
10. Which of the following organisms are spread
through
arthropod vectors?
a. N. meningitidis and S. pyogenes
b. Salmonella and Shigella
c. Herpes simplex virus and T. pallidum
d. Plasmodium and Borrelia Correct Answers d.
Plasmodium and Borrelia
10. Which statement is incorrect for
Staphylococcus
epidermidis?
a. Is coagulase negative
b. Fails to grow on mannitol salt agar
c. Is DNase negative
Questions With Complete Solutions
10. A patient's serum yields a positive RPR and a
negative
TPPA. These results most likely indicate:
a. Reactive for syphilis
b. False-negative FTA-absorbed from low sensitivity
of
the test
c. Biological false-positive RPR from cross-reacting
antibodies
d. Patient in remission for syphilis Correct Answers
10. Acinetobacter can be differentiated from
Neisseria by:
a. A positive oxidase reaction for Neisseria
b. Gram stain
c. Carbohydrate utilization patterns
d. Pigment production Correct Answers
10. An organism that cannot use oxygen as the
final
electron acceptor and is inhibited by its presence is
a(an):
a. Obligate aerobe
b. Obligate anaerobe
c. Facultative anaerobe
d. Microaerophile Correct Answers
,10. If a branching gram-positive bacillus with a
pleomorphic morphology is observed, which of the
following can be ruled out?
a. Listeria
b. Lactobacillus
c. Nocardia
d. Streptomyces Correct Answers
10. In the Gram stain technique, Gram's iodine
functions as
the:
a. Primary stain
b. Mordant
c. Decolorizer
d. Counterstain Correct Answers b. Mordant
10. Neisseria meningitidis can be carried , which
serves as a reservoir for infection.
a. in the nasopharynx
b. in the blood
c. in the oral cavity
d. on the skin Correct Answers a. in the
nasopharynx
10. Streptolysin O is:
a. Oxygen stable
b. Antigenic
c. Observed as surface hemolysis
d. All the above Correct Answers b. Antigenic
,10. The interaction between single-stranded
nucleic acid
molecules to form a double-stranded molecule is
known as:
a. Blotting
b. Hybridization
c. Denaturation
d. A DNA probe Correct Answers b. Hybridization
10. The iodine stain for identification of C.
trachomatis
stains:
a. The glycogen in the inclusion brown
b. The periplasmic space purple
c. The cell membrane brown
d. The DNA in the inclusion purple Correct Answers
10. The optimal wound specimen for culture of
anaerobic
organisms should be:
a. A swab of lesion obtained before administration
of
antibiotics
b. A swab of lesion obtained after administration of
antibiotics
c. A syringe filled with pus obtained before
administration of antibiotics
d. A syringe filled with pus obtained after
, administration of antibiotics Correct Answers c. A
syringe filled with pus obtained before
administration of antibiotics
10. The population most frequently infected by
H. influenzae is:
a. Newborns
b. Nonimmunized infants and children less than
3 years of age
c. Nonimmunized preschool-age children, ages 3 to
5 years
d. School-age children, ages 6 to 10 years
e. Immunosuppressed adults Correct Answers
10. Which of the following organisms are spread
through
arthropod vectors?
a. N. meningitidis and S. pyogenes
b. Salmonella and Shigella
c. Herpes simplex virus and T. pallidum
d. Plasmodium and Borrelia Correct Answers d.
Plasmodium and Borrelia
10. Which statement is incorrect for
Staphylococcus
epidermidis?
a. Is coagulase negative
b. Fails to grow on mannitol salt agar
c. Is DNase negative
