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UAMS Microbiology Exam 2 Practice Questions &
Answers (Verified Update)
This comprehensive study guide covers the core domains tested
on UAMS Microbiology Exam 2, aligned with the 2026–2027
curriculum. It includes over 200 original practice questions with
detailed rationales, organized by the core exam domains:
Bacterial Identification & Diagnostic Tests, Gram-Positive
Organisms, Gram-Negative Organisms, Antimicrobial Agents &
Susceptibility Testing, Immunology & Host Defense, and
Clinical Microbiology Case Studies.
Exam Overview & Blueprint:
Parameter Details
Exam Format Multiple-choice, true/false, and case-based questions
Core Topics Bacterial identification, diagnostic tests, antimicrobial susceptibility, immunology, clinical case studies
Key Organisms Neisseria, Haemophilus, Enterobacteriaceae, Staphylococcus, Streptococcus, Pseudomonas
Key Tests Oxidase, catalase, coagulase, carbohydrate utilization, TSI, Kirby-Bauer, MIC
2026 Focus Case-based clinical scenarios, antibiotic susceptibility interpretation, diagnostic test selection
Section 1: Bacterial Identification & Diagnostic Tests (Q1–Q50)
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Q1. Which test is used to detect the enzyme cytochrome c
oxidase in bacteria?
A) Catalase test
B) Oxidase test
C) Coagulase test
D) Urease test
Answer: B
Rationale: The oxidase test detects cytochrome c oxidase.
Tetramethyl-para-phenylenediamine dihydrochloride is the
reagent used. A positive result produces a blue color.
Q2. What reagent is used in the oxidase test?
A) Hydrogen peroxide
B) Tetramethyl-para-phenylenediamine dihydrochloride
C) Phenol red
D) Kovac's reagent
Answer: B
Rationale: Tetramethyl-para-phenylenediamine dihydrochloride
is the reagent used in the oxidase test. A positive result
produces a blue color, while a negative result shows no color
change.
Q3. What is the pH indicator used in carbohydrate utilization
tests?
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A) Phenol red
B) Bromothymol blue
C) Methyl red
D) Neutral red
Answer: A
Rationale: Phenol red is the pH indicator used in carbohydrate
utilization tests. A positive result (acid production) turns yellow,
while a negative result remains red.
Q4. In the carbohydrate utilization test, what does a yellow
result indicate?
A) No fermentation
B) Acid production from carbohydrate fermentation
C) Gas production
D) Alkaline reaction
Answer: B
Rationale: A yellow result indicates acid production from
carbohydrate fermentation (positive). A red result indicates no
fermentation (negative).
Q5. Which test is used to detect the enzyme catalase?
A) Oxidase test
B) Catalase test
C) Coagulase test
D) Indole test
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Answer: B
Rationale: The catalase test detects the enzyme catalase, which
breaks down hydrogen peroxide into water and oxygen. A
positive result produces bubbles.
Q6. What reagent is used in the catalase test?
A) Hydrogen peroxide
B) Tetramethyl-para-phenylenediamine
C) Phenol red
D) Kovac's reagent
Answer: A
Rationale: Hydrogen peroxide (H₂O₂) is used in the catalase
test. Catalase-positive organisms produce bubbles (oxygen gas).
Q7. Which organism is catalase-positive?
A) Streptococcus
B) Staphylococcus
C) Enterococcus
D) Lactobacillus
Answer: B
Rationale: Staphylococcus is catalase-positive. Streptococcus
and Enterococcus are catalase-negative.
Q8. What is the purpose of the coagulase test?
A) To differentiate Staphylococcus aureus from other
Staphylococcus species
UAMS Microbiology Exam 2 Practice Questions &
Answers (Verified Update)
This comprehensive study guide covers the core domains tested
on UAMS Microbiology Exam 2, aligned with the 2026–2027
curriculum. It includes over 200 original practice questions with
detailed rationales, organized by the core exam domains:
Bacterial Identification & Diagnostic Tests, Gram-Positive
Organisms, Gram-Negative Organisms, Antimicrobial Agents &
Susceptibility Testing, Immunology & Host Defense, and
Clinical Microbiology Case Studies.
Exam Overview & Blueprint:
Parameter Details
Exam Format Multiple-choice, true/false, and case-based questions
Core Topics Bacterial identification, diagnostic tests, antimicrobial susceptibility, immunology, clinical case studies
Key Organisms Neisseria, Haemophilus, Enterobacteriaceae, Staphylococcus, Streptococcus, Pseudomonas
Key Tests Oxidase, catalase, coagulase, carbohydrate utilization, TSI, Kirby-Bauer, MIC
2026 Focus Case-based clinical scenarios, antibiotic susceptibility interpretation, diagnostic test selection
Section 1: Bacterial Identification & Diagnostic Tests (Q1–Q50)
, Page |2
Q1. Which test is used to detect the enzyme cytochrome c
oxidase in bacteria?
A) Catalase test
B) Oxidase test
C) Coagulase test
D) Urease test
Answer: B
Rationale: The oxidase test detects cytochrome c oxidase.
Tetramethyl-para-phenylenediamine dihydrochloride is the
reagent used. A positive result produces a blue color.
Q2. What reagent is used in the oxidase test?
A) Hydrogen peroxide
B) Tetramethyl-para-phenylenediamine dihydrochloride
C) Phenol red
D) Kovac's reagent
Answer: B
Rationale: Tetramethyl-para-phenylenediamine dihydrochloride
is the reagent used in the oxidase test. A positive result
produces a blue color, while a negative result shows no color
change.
Q3. What is the pH indicator used in carbohydrate utilization
tests?
, Page |3
A) Phenol red
B) Bromothymol blue
C) Methyl red
D) Neutral red
Answer: A
Rationale: Phenol red is the pH indicator used in carbohydrate
utilization tests. A positive result (acid production) turns yellow,
while a negative result remains red.
Q4. In the carbohydrate utilization test, what does a yellow
result indicate?
A) No fermentation
B) Acid production from carbohydrate fermentation
C) Gas production
D) Alkaline reaction
Answer: B
Rationale: A yellow result indicates acid production from
carbohydrate fermentation (positive). A red result indicates no
fermentation (negative).
Q5. Which test is used to detect the enzyme catalase?
A) Oxidase test
B) Catalase test
C) Coagulase test
D) Indole test
, Page |4
Answer: B
Rationale: The catalase test detects the enzyme catalase, which
breaks down hydrogen peroxide into water and oxygen. A
positive result produces bubbles.
Q6. What reagent is used in the catalase test?
A) Hydrogen peroxide
B) Tetramethyl-para-phenylenediamine
C) Phenol red
D) Kovac's reagent
Answer: A
Rationale: Hydrogen peroxide (H₂O₂) is used in the catalase
test. Catalase-positive organisms produce bubbles (oxygen gas).
Q7. Which organism is catalase-positive?
A) Streptococcus
B) Staphylococcus
C) Enterococcus
D) Lactobacillus
Answer: B
Rationale: Staphylococcus is catalase-positive. Streptococcus
and Enterococcus are catalase-negative.
Q8. What is the purpose of the coagulase test?
A) To differentiate Staphylococcus aureus from other
Staphylococcus species
