University of Texas, Arlington NURS 5334/NURS5334:
Comprehensive Exam
180+ Questions and Correct Answers (Explained) | 100%
Correct 2025/26
Antimicrobials (40 Questions)
1. What is the primary mechanism of action of beta-lactam antibiotics like
penicillin?
A) Inhibits protein synthesis
B) Inhibits cell wall synthesis
C) Alters DNA replication
D) Blocks folic acid synthesis
Correct Answer: B
Rationale: Beta-lactams inhibit bacterial cell wall synthesis by irreversibly
binding to penicillin-binding proteins (PBPs), which are essential for the
cross-linking of peptidoglycan.
2. Which generation of cephalosporins is most effective
against Pseudomonas aeruginosa?
A) First
B) Second
C) Third
D) Fourth
Correct Answer: D
, Rationale: Fourth-generation cephalosporins like cefepime are the only ones
among the options that have reliable activity against Pseudomonas
aeruginosa. Ceftazidime (third-generation) also has activity, but cefepime is
a classic example.
3. Vancomycin is the drug of choice for:
A) MRSA infections
B) VRE infections
C) UTI
D) Syphilis
Correct Answer: A
Rationale: Vancomycin is a glycopeptide antibiotic that is the first-line
treatment for serious infections caused by methicillin-
resistant Staphylococcus aureus (MRSA).
4. What is the peak concern with aminoglycosides?
A) Stevens-Johnson syndrome
B) Hepatotoxicity
C) Ototoxicity and nephrotoxicity
D) Anemia
Correct Answer: C
Rationale: Aminoglycosides (e.g., gentamicin, tobramycin) are known for
their narrow therapeutic window and significant risks of dose-dependent,
irreversible ototoxicity (damage to the inner ear) and nephrotoxicity
(damage to the kidneys).
,5. What mineral interactions reduce the absorption of tetracyclines?
A) Sodium
B) Potassium
C) Calcium, iron, magnesium
D) Phosphate
Correct Answer: C
Rationale: Tetracyclines form non-absorbable chelates with divalent and
trivalent cations such as calcium (dairy products), iron (supplements), and
magnesium (antacids), significantly reducing their oral bioavailability.
6. A patient reports an anaphylactic reaction to penicillin. Which antibiotic
class should be avoided due to a potential cross-sensitivity?
A) Macrolides
B) Fluoroquinolones
C) Cephalosporins
D) Tetracyclines
Correct Answer: C
*Rationale: While the cross-reactivity is lower than once thought (~1-2%),
there is a potential for cross-allergy between penicillins and cephalosporins
due to the shared beta-lactam ring structure.*
7. What is the mechanism of action for macrolides like azithromycin?
A) Disrupts cell membrane function
B) Inhibits bacterial protein synthesis (50S ribosome)
C) Inhibits DNA gyrase
D) Inhibits cell wall synthesis
, Correct Answer: B
Rationale: Macrolides bind reversibly to the 50S ribosomal subunit, blocking
the translocation step of protein synthesis, which inhibits bacterial growth.
8. Which antibiotic is associated with the adverse effect of tendonitis and
tendon rupture, especially in patients over 60?
A) Doxycycline
B) Ciprofloxacin
C) Amoxicillin
D) Clindamycin
Correct Answer: B
Rationale: Fluoroquinolones like ciprofloxacin carry a black box warning for
an increased risk of tendonitis and tendon rupture, particularly affecting the
Achilles tendon.
9. A patient is taking warfarin. Which antibiotic class is most likely to
increase the risk of bleeding by potentiating its anticoagulant effect?
A) Penicillins
B) Tetracyclines
C) Macrolides
D) Cephalosporins
Correct Answer: C
Rationale: Macrolides (e.g., clarithromycin, erythromycin) are strong
inhibitors of the CYP450 enzyme system (specifically CYP3A4), which can
inhibit the metabolism of warfarin, leading to elevated INR and increased
bleeding risk.
Comprehensive Exam
180+ Questions and Correct Answers (Explained) | 100%
Correct 2025/26
Antimicrobials (40 Questions)
1. What is the primary mechanism of action of beta-lactam antibiotics like
penicillin?
A) Inhibits protein synthesis
B) Inhibits cell wall synthesis
C) Alters DNA replication
D) Blocks folic acid synthesis
Correct Answer: B
Rationale: Beta-lactams inhibit bacterial cell wall synthesis by irreversibly
binding to penicillin-binding proteins (PBPs), which are essential for the
cross-linking of peptidoglycan.
2. Which generation of cephalosporins is most effective
against Pseudomonas aeruginosa?
A) First
B) Second
C) Third
D) Fourth
Correct Answer: D
, Rationale: Fourth-generation cephalosporins like cefepime are the only ones
among the options that have reliable activity against Pseudomonas
aeruginosa. Ceftazidime (third-generation) also has activity, but cefepime is
a classic example.
3. Vancomycin is the drug of choice for:
A) MRSA infections
B) VRE infections
C) UTI
D) Syphilis
Correct Answer: A
Rationale: Vancomycin is a glycopeptide antibiotic that is the first-line
treatment for serious infections caused by methicillin-
resistant Staphylococcus aureus (MRSA).
4. What is the peak concern with aminoglycosides?
A) Stevens-Johnson syndrome
B) Hepatotoxicity
C) Ototoxicity and nephrotoxicity
D) Anemia
Correct Answer: C
Rationale: Aminoglycosides (e.g., gentamicin, tobramycin) are known for
their narrow therapeutic window and significant risks of dose-dependent,
irreversible ototoxicity (damage to the inner ear) and nephrotoxicity
(damage to the kidneys).
,5. What mineral interactions reduce the absorption of tetracyclines?
A) Sodium
B) Potassium
C) Calcium, iron, magnesium
D) Phosphate
Correct Answer: C
Rationale: Tetracyclines form non-absorbable chelates with divalent and
trivalent cations such as calcium (dairy products), iron (supplements), and
magnesium (antacids), significantly reducing their oral bioavailability.
6. A patient reports an anaphylactic reaction to penicillin. Which antibiotic
class should be avoided due to a potential cross-sensitivity?
A) Macrolides
B) Fluoroquinolones
C) Cephalosporins
D) Tetracyclines
Correct Answer: C
*Rationale: While the cross-reactivity is lower than once thought (~1-2%),
there is a potential for cross-allergy between penicillins and cephalosporins
due to the shared beta-lactam ring structure.*
7. What is the mechanism of action for macrolides like azithromycin?
A) Disrupts cell membrane function
B) Inhibits bacterial protein synthesis (50S ribosome)
C) Inhibits DNA gyrase
D) Inhibits cell wall synthesis
, Correct Answer: B
Rationale: Macrolides bind reversibly to the 50S ribosomal subunit, blocking
the translocation step of protein synthesis, which inhibits bacterial growth.
8. Which antibiotic is associated with the adverse effect of tendonitis and
tendon rupture, especially in patients over 60?
A) Doxycycline
B) Ciprofloxacin
C) Amoxicillin
D) Clindamycin
Correct Answer: B
Rationale: Fluoroquinolones like ciprofloxacin carry a black box warning for
an increased risk of tendonitis and tendon rupture, particularly affecting the
Achilles tendon.
9. A patient is taking warfarin. Which antibiotic class is most likely to
increase the risk of bleeding by potentiating its anticoagulant effect?
A) Penicillins
B) Tetracyclines
C) Macrolides
D) Cephalosporins
Correct Answer: C
Rationale: Macrolides (e.g., clarithromycin, erythromycin) are strong
inhibitors of the CYP450 enzyme system (specifically CYP3A4), which can
inhibit the metabolism of warfarin, leading to elevated INR and increased
bleeding risk.
