GALEN COLLEGE OF NURSING
Course Code: BIO 2100
Instructor:
Date: 2026
FINAL EXAM – MICROBIOLOGY FOR HEALTH
PROFESSIONS
Multiple Choice (15 questions)
A 65-year-old patient develops a catheter-associated urinary tract infection
caused by Escherichia coli. Which bacterial virulence factor primarily
facilitates colonization of the urinary tract?
A. Exotoxin production
B. Flagella-mediated motility
C. Fimbriae/pili adhesion
D. Capsule formation
Answer: C
Rationale: Fimbriae or pili enable E. coli to adhere to uroepithelial cells,
critical for colonization and infection.
Which of the following staining techniques is best suited to identify
Mycobacterium tuberculosis in a sputum sample?
A. Gram stain
B. Acid-fast stain (Ziehl-Neelsen)
C. Endospore stain
D. Capsule stain
Answer: B
Rationale: Mycobacterium tuberculosis has a mycolic acid-rich cell wall
making it acid-fast positive; Ziehl-Neelsen stain targets this.
A nursing student needs to classify a patient's wound infection pathogen that
produces biofilms. Which genus is most commonly associated with biofilm
1
,formation in healthcare settings?
A. Staphylococcus
B. Streptococcus
C. Clostridium
D. Neisseria
Answer: A
Rationale: Staphylococcus aureus and coagulase-negative staphylococci
commonly form biofilms on medical devices, complicating infections.
Which antibiotic mechanism targets bacterial cell wall synthesis, making it
effective against Gram-positive bacteria, but less so against Gram-negative?
A. Inhibition of DNA gyrase
B. Binding to 30S ribosomal subunit
C. Beta-lactam antibiotics inhibiting peptidoglycan cross-linking
D. Disrupting bacterial plasma membrane
Answer: C
Rationale: Beta-lactams inhibit penicillin-binding proteins critical for
peptidoglycan cross-linking predominantly affecting Gram-positive due to
thicker cell wall.
In an ICU patient, Clostridioides difficile infection presents following broad-
spectrum antibiotic therapy. What microbial feature enables C. difficile to
survive harsh conditions and cause relapse?
A. Endospore formation
B. Capsule formation
C. Biofilm production
D. Exotoxin secretion
Answer: A
Rationale: C. difficile produces endospores which resist environmental
stresses and standard disinfectants, allowing persistence.
Which immune response cell type is primarily responsible for phagocytosis of
bacteria during an acute infection?
A. B lymphocytes
B. Neutrophils
C. T helper cells
D. Eosinophils
Answer: B
Rationale: Neutrophils are the primary phagocytic cells responding early to
bacterial infections.
A patient with HIV has recurrent fungal infections. Which staining technique
is optimal for detecting fungal pathogens in tissue samples?
2
, A. Gram stain
B. India ink stain
C. Silver methenamine stain (Gomori)
D. Acid-fast stain
Answer: C
Rationale: Silver stains highlight fungal cell walls, useful for detecting fungi
like Pneumocystis jirovecii.
Which of these bacteria is most commonly linked to ventilator-associated
pneumonia in the hospital setting?
A. Pseudomonas aeruginosa
B. Streptococcus pyogenes
C. Listeria monocytogenes
D. Lactobacillus species
Answer: A
Rationale: Pseudomonas aeruginosa is an opportunistic pathogen common
in ventilator-associated pneumonia due to its antibiotic resistance and biofilm
capability.
During an outbreak investigation, a bacterial strain produces extended-
spectrum beta-lactamases (ESBL). Which antibiotics would be ineffective?
A. Carbapenems
B. Penicillins
C. Aminoglycosides
D. Fluoroquinolones
Answer: B
Rationale: ESBL enzymes hydrolyze penicillins and some cephalosporins,
making these antibiotics ineffective.
In sepsis, pathogen-associated molecular patterns interact primarily with
which class of host receptors to trigger inflammation?
A. G-protein coupled receptors (GPCRs)
B. Toll-like receptors (TLRs)
C. Ion channels
D. Nuclear hormone receptors
Answer: B
Rationale: TLRs recognize microbial components like lipopolysaccharide,
initiating innate immune responses.
Fill in the blank: The process by which bacteria acquire genetic material from
the environment is called ____.
Answer: Transformation
Rationale: Transformation is uptake of free DNA from the environment
3
Course Code: BIO 2100
Instructor:
Date: 2026
FINAL EXAM – MICROBIOLOGY FOR HEALTH
PROFESSIONS
Multiple Choice (15 questions)
A 65-year-old patient develops a catheter-associated urinary tract infection
caused by Escherichia coli. Which bacterial virulence factor primarily
facilitates colonization of the urinary tract?
A. Exotoxin production
B. Flagella-mediated motility
C. Fimbriae/pili adhesion
D. Capsule formation
Answer: C
Rationale: Fimbriae or pili enable E. coli to adhere to uroepithelial cells,
critical for colonization and infection.
Which of the following staining techniques is best suited to identify
Mycobacterium tuberculosis in a sputum sample?
A. Gram stain
B. Acid-fast stain (Ziehl-Neelsen)
C. Endospore stain
D. Capsule stain
Answer: B
Rationale: Mycobacterium tuberculosis has a mycolic acid-rich cell wall
making it acid-fast positive; Ziehl-Neelsen stain targets this.
A nursing student needs to classify a patient's wound infection pathogen that
produces biofilms. Which genus is most commonly associated with biofilm
1
,formation in healthcare settings?
A. Staphylococcus
B. Streptococcus
C. Clostridium
D. Neisseria
Answer: A
Rationale: Staphylococcus aureus and coagulase-negative staphylococci
commonly form biofilms on medical devices, complicating infections.
Which antibiotic mechanism targets bacterial cell wall synthesis, making it
effective against Gram-positive bacteria, but less so against Gram-negative?
A. Inhibition of DNA gyrase
B. Binding to 30S ribosomal subunit
C. Beta-lactam antibiotics inhibiting peptidoglycan cross-linking
D. Disrupting bacterial plasma membrane
Answer: C
Rationale: Beta-lactams inhibit penicillin-binding proteins critical for
peptidoglycan cross-linking predominantly affecting Gram-positive due to
thicker cell wall.
In an ICU patient, Clostridioides difficile infection presents following broad-
spectrum antibiotic therapy. What microbial feature enables C. difficile to
survive harsh conditions and cause relapse?
A. Endospore formation
B. Capsule formation
C. Biofilm production
D. Exotoxin secretion
Answer: A
Rationale: C. difficile produces endospores which resist environmental
stresses and standard disinfectants, allowing persistence.
Which immune response cell type is primarily responsible for phagocytosis of
bacteria during an acute infection?
A. B lymphocytes
B. Neutrophils
C. T helper cells
D. Eosinophils
Answer: B
Rationale: Neutrophils are the primary phagocytic cells responding early to
bacterial infections.
A patient with HIV has recurrent fungal infections. Which staining technique
is optimal for detecting fungal pathogens in tissue samples?
2
, A. Gram stain
B. India ink stain
C. Silver methenamine stain (Gomori)
D. Acid-fast stain
Answer: C
Rationale: Silver stains highlight fungal cell walls, useful for detecting fungi
like Pneumocystis jirovecii.
Which of these bacteria is most commonly linked to ventilator-associated
pneumonia in the hospital setting?
A. Pseudomonas aeruginosa
B. Streptococcus pyogenes
C. Listeria monocytogenes
D. Lactobacillus species
Answer: A
Rationale: Pseudomonas aeruginosa is an opportunistic pathogen common
in ventilator-associated pneumonia due to its antibiotic resistance and biofilm
capability.
During an outbreak investigation, a bacterial strain produces extended-
spectrum beta-lactamases (ESBL). Which antibiotics would be ineffective?
A. Carbapenems
B. Penicillins
C. Aminoglycosides
D. Fluoroquinolones
Answer: B
Rationale: ESBL enzymes hydrolyze penicillins and some cephalosporins,
making these antibiotics ineffective.
In sepsis, pathogen-associated molecular patterns interact primarily with
which class of host receptors to trigger inflammation?
A. G-protein coupled receptors (GPCRs)
B. Toll-like receptors (TLRs)
C. Ion channels
D. Nuclear hormone receptors
Answer: B
Rationale: TLRs recognize microbial components like lipopolysaccharide,
initiating innate immune responses.
Fill in the blank: The process by which bacteria acquire genetic material from
the environment is called ____.
Answer: Transformation
Rationale: Transformation is uptake of free DNA from the environment
3
