Microbiology Exam Review 3 Ch. 6, 9-13
MICROBIOLOGY EXAM REVIEW 3 CH. 6, 9-13 NEWEST
2025/2026 ACTUAL EXAM COMPLETE 150 QUESTIONS AND
CORRECT DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY
GRADED A+||BRAND NEW VERSION!!
An organism isolated from a sputum sample that has a "hockey puck" consistency
would have which of the following biochemical profiles?
Glucose-positive, maltose-negative, and lactose-negative
Glucose-negative, maltose-negative, and lactose-negative
Glucose-positive, maltose-positive, and lactose-positive
Glucose-positive, maltose-positive, and lactose-negative - Correct Answer-
Glucose-negative, maltose-negative, and lactose-negative
A gram-negative diplococcus isolated from a nasopharyngeal culture yielded the
following results:
2+ small, grayish non-hemolytic colonies on blood agar, 3+ small, tan colonies on
chocolate; oxidase positive; glucose and maltose positive; beta-lactamase
(cefinase) positive.
What antibiotic should definitely NOT be prescribed for this infection?
Penicillin
Ceftriaxone
Spectinomycin
Tetracycline - Correct Answer-Penicillin
1|Page
, Microbiology Exam Review 3 Ch. 6, 9-13
A gram-negative diplococcus grew on 5% sheep blood agar and chocolate agar,
had no growth on MacConkey agar, and had no growth on modified Thayer-Martin
(MTM) agar. The organism was identified as N. sicca. Which one of the following
statements explains the discrepancy of the results obtained on the MTM agar?
-The organism was most likely incorrectly transported.
-The medium was most likely expired.
-No discrepancy is present. N. sicca does not grow on MTM agar.
-The organism was most likely incubated at 35° C instead of 25° C. - Correct
Answer-No discrepancy is present. N. sicca does not grow on MTM agar.
The differentiation of the similar Moraxella catarrhalis and Neisseria spp can be
best accomplished by:
the oxidase test
glucose utilization testing
examination of Gram stain of the colony
vancomycin susceptibility testing - Correct Answer-glucose utilization testing
Modified Thayer Martin (MTM), Martin-Lewis (ML), and New York City (NYC)
media were all developed for the selective isolation of which organism?
Neisseria gonorrhoeae
Neisseria mucosa
Neisseria meningitidis
Moraxella catarrhalis - Correct Answer-Neisseria gonorrhoeae
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, Microbiology Exam Review 3 Ch. 6, 9-13
Cotton swabs are preferred for the collection and transport of specimens to be
cultured for Neisseria gonorrhoeae. - Correct Answer-False
Moraxella catarrhalis may be described as:
often carrying an antiphagocytic capsule.
a major cause of venereal disease.
oxidase-positive.
a glucose utilizer. - Correct Answer-oxidase-positive.
The gram-negative coccus that can be described as oxidase-positive, glucose-
negative, maltose-negative, sucrose-negative, lactose-negative, and DNase-
positive is:
Moraxella catarrhalis.
Neisseria cinerea.
Neisseria gonorrhoeae.
Neisseria meningitidis. - Correct Answer-Moraxella catarrhalis.
Moraxella catarrhalis can be described as a:
gram-positive diplococcus
gram-negative diplococcus
gram-negative bacillus
gram-negative coccobacillus - Correct Answer-gram-negative diplococcus
3|Page
, Microbiology Exam Review 3 Ch. 6, 9-13
Moraxella catarrhalis may be differentiated from gonococci and meningococci on
the basis of its:
growth on nutrient agar at 22° C.
reduction of nitrate to nitrate.
growth on blood agar at 35° C.
production of DNase. - Correct Answer-production of DNase.
Which statement correctly describes the mode of action of the antibiotic listed for
modified Thayer-Martin medium?
Nystatin inhibits fungi and molds
Trimothoprim inhibits gram-positive bacteria
Colistin inhibits gram-positive bacteria
Vancomycin inhibits gram-negative bacteria - Correct Answer-Nystatin inhibits
fungi and molds
An infant has been diagnosed with bacterial meningitis. Further testing of the
spinal fluid would likely indicate:
-Increased white blood cells with a predominance of neutrophils, increased
glucose, and decreased protein.
-Increased white blood cells with a predominance of neutrophils, decreased
glucose, and increased protein.
-Increased white blood cells with a predominance of lymphocytes, decreased
glucose, and increased protein.
-Decreased white blood cells, increased protein, and decreased glucose. - Correct
Answer-Increased white blood cells with a predominance of neutrophils,
decreased glucose, and increased protein.
4|Page
MICROBIOLOGY EXAM REVIEW 3 CH. 6, 9-13 NEWEST
2025/2026 ACTUAL EXAM COMPLETE 150 QUESTIONS AND
CORRECT DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY
GRADED A+||BRAND NEW VERSION!!
An organism isolated from a sputum sample that has a "hockey puck" consistency
would have which of the following biochemical profiles?
Glucose-positive, maltose-negative, and lactose-negative
Glucose-negative, maltose-negative, and lactose-negative
Glucose-positive, maltose-positive, and lactose-positive
Glucose-positive, maltose-positive, and lactose-negative - Correct Answer-
Glucose-negative, maltose-negative, and lactose-negative
A gram-negative diplococcus isolated from a nasopharyngeal culture yielded the
following results:
2+ small, grayish non-hemolytic colonies on blood agar, 3+ small, tan colonies on
chocolate; oxidase positive; glucose and maltose positive; beta-lactamase
(cefinase) positive.
What antibiotic should definitely NOT be prescribed for this infection?
Penicillin
Ceftriaxone
Spectinomycin
Tetracycline - Correct Answer-Penicillin
1|Page
, Microbiology Exam Review 3 Ch. 6, 9-13
A gram-negative diplococcus grew on 5% sheep blood agar and chocolate agar,
had no growth on MacConkey agar, and had no growth on modified Thayer-Martin
(MTM) agar. The organism was identified as N. sicca. Which one of the following
statements explains the discrepancy of the results obtained on the MTM agar?
-The organism was most likely incorrectly transported.
-The medium was most likely expired.
-No discrepancy is present. N. sicca does not grow on MTM agar.
-The organism was most likely incubated at 35° C instead of 25° C. - Correct
Answer-No discrepancy is present. N. sicca does not grow on MTM agar.
The differentiation of the similar Moraxella catarrhalis and Neisseria spp can be
best accomplished by:
the oxidase test
glucose utilization testing
examination of Gram stain of the colony
vancomycin susceptibility testing - Correct Answer-glucose utilization testing
Modified Thayer Martin (MTM), Martin-Lewis (ML), and New York City (NYC)
media were all developed for the selective isolation of which organism?
Neisseria gonorrhoeae
Neisseria mucosa
Neisseria meningitidis
Moraxella catarrhalis - Correct Answer-Neisseria gonorrhoeae
2|Page
, Microbiology Exam Review 3 Ch. 6, 9-13
Cotton swabs are preferred for the collection and transport of specimens to be
cultured for Neisseria gonorrhoeae. - Correct Answer-False
Moraxella catarrhalis may be described as:
often carrying an antiphagocytic capsule.
a major cause of venereal disease.
oxidase-positive.
a glucose utilizer. - Correct Answer-oxidase-positive.
The gram-negative coccus that can be described as oxidase-positive, glucose-
negative, maltose-negative, sucrose-negative, lactose-negative, and DNase-
positive is:
Moraxella catarrhalis.
Neisseria cinerea.
Neisseria gonorrhoeae.
Neisseria meningitidis. - Correct Answer-Moraxella catarrhalis.
Moraxella catarrhalis can be described as a:
gram-positive diplococcus
gram-negative diplococcus
gram-negative bacillus
gram-negative coccobacillus - Correct Answer-gram-negative diplococcus
3|Page
, Microbiology Exam Review 3 Ch. 6, 9-13
Moraxella catarrhalis may be differentiated from gonococci and meningococci on
the basis of its:
growth on nutrient agar at 22° C.
reduction of nitrate to nitrate.
growth on blood agar at 35° C.
production of DNase. - Correct Answer-production of DNase.
Which statement correctly describes the mode of action of the antibiotic listed for
modified Thayer-Martin medium?
Nystatin inhibits fungi and molds
Trimothoprim inhibits gram-positive bacteria
Colistin inhibits gram-positive bacteria
Vancomycin inhibits gram-negative bacteria - Correct Answer-Nystatin inhibits
fungi and molds
An infant has been diagnosed with bacterial meningitis. Further testing of the
spinal fluid would likely indicate:
-Increased white blood cells with a predominance of neutrophils, increased
glucose, and decreased protein.
-Increased white blood cells with a predominance of neutrophils, decreased
glucose, and increased protein.
-Increased white blood cells with a predominance of lymphocytes, decreased
glucose, and increased protein.
-Decreased white blood cells, increased protein, and decreased glucose. - Correct
Answer-Increased white blood cells with a predominance of neutrophils,
decreased glucose, and increased protein.
4|Page
