NURS5334 ABX Questions and Answers Spring 2025 University of Texas Arlington

I will now generate 100 challenging multiple-choice questions based on the provided documents.
These questions will focus on critical thinking, application, and synthesis of knowledge related
to antimicrobials, including drug interactions, mechanisms of action, resistance, and clinical
scenarios.

I will format them as follows:

1. Question
o A) Option 1
o B) Option 2
o C) Option 3
o D) Option 4
Answer: (Correct option)
Explanation: (Detailed reasoning behind the correct choice)

This will ensure each question is informative and thought-provoking. I will now compile the
questions and present them in a structured format.

Here is a set of 100 multiple-choice questions designed to test critical thinking, application, and
synthesis of knowledge in antimicrobial therapy.




Antimicrobial Therapy: Advanced Multiple-Choice
Questions
Section 1: General Principles of Antimicrobial Therapy



1. A patient with a history of penicillin anaphylaxis requires treatment for a gram-
negative infection. Which antibiotic is the safest alternative?
o A) Cefazolin
o B) Aztreonam
o C) Meropenem
o D) Ampicillin-sulbactam
Answer: B) Aztreonam
Explanation: Aztreonam is a monobactam with minimal cross-reactivity to
penicillins, making it a safer alternative in penicillin-allergic patients.
2. A critically ill patient presents with neutropenic fever. What is the best initial
empiric therapy?
o A) Vancomycin
o B) Cefepime
o C) Clindamycin
o D) Amoxicillin
Answer: B) Cefepime
Explanation: Cefepime provides broad-spectrum coverage, including
Pseudomonas, and is a first-line choice for neutropenic fever.

, 3. Which of the following is NOT a factor in selecting an appropriate antimicrobial
agent?
o A) Route of administration
o B) Minimum inhibitory concentration (MIC)
o C) Patient’s age
o D) The presence of viral infection
Answer: D) The presence of viral infection
Explanation: Antibiotics are ineffective against viral infections, and their
presence does not determine antibiotic selection.



Section 2: Cell Wall Synthesis Inhibitors



4. Which of the following beta-lactam antibiotics is most resistant to beta-lactamases?
o A) Amoxicillin
o B) Cefepime
o C) Piperacillin
o D) Penicillin G
Answer: B) Cefepime
Explanation: Cefepime (a 4th-generation cephalosporin) is more resistant to
beta-lactamases compared to the other options.
5. What is the primary mechanism of resistance against methicillin in MRSA?
o A) Beta-lactamase production
o B) Efflux pumps
o C) Altered penicillin-binding proteins (PBPs)
o D) Reduced drug permeability
Answer: C) Altered PBPs
Explanation: MRSA produces an altered PBP (PBP2a) with low affinity for beta-
lactams, conferring resistance.



Section 3: Protein Synthesis Inhibitors



6. Which of the following antibiotics inhibits bacterial protein synthesis by binding to
the 50S ribosomal subunit?
o A) Gentamicin
o B) Doxycycline
o C) Azithromycin
o D) Ciprofloxacin
Answer: C) Azithromycin
Explanation: Macrolides like azithromycin inhibit bacterial protein synthesis by
binding to the 50S subunit.

, 7. Aminoglycosides should be avoided in patients with which condition due to
increased toxicity risk?
o A) Liver failure
o B) Renal failure
o C) Diabetes
o D) Asthma
Answer: B) Renal failure
Explanation: Aminoglycosides are nephrotoxic and require dose adjustments in
renal dysfunction.



Section 4: DNA/RNA Synthesis Inhibitors



8. Which of the following statements about fluoroquinolones is TRUE?
o A) They inhibit bacterial DNA gyrase and topoisomerase IV.
o B) They are recommended for treating pediatric patients.
o C) They have no activity against gram-negative organisms.
o D) They are primarily bacteriostatic.
Answer: A) They inhibit bacterial DNA gyrase and topoisomerase IV.
Explanation: Fluoroquinolones work by inhibiting bacterial DNA synthesis via
these enzymes.
9. Which fluoroquinolone is most effective against Pseudomonas aeruginosa?
o A) Moxifloxacin
o B) Levofloxacin
o C) Ciprofloxacin
o D) Nalidixic acid
Answer: C) Ciprofloxacin
Explanation: Ciprofloxacin has the strongest activity against Pseudomonas.



Section 5: Antifungal & Antiviral Agents



10. What is the mechanism of action of azole antifungals?

• A) Inhibition of squalene epoxidase
• B) Disruption of the fungal cell membrane
• C) Inhibition of ergosterol synthesis
• D) Inhibition of DNA polymerase
Answer: C) Inhibition of ergosterol synthesis
Explanation: Azoles inhibit lanosterol 14α-demethylase, an enzyme required for
ergosterol synthesis.

, 11. Which antiviral agent is a nucleoside analog used to treat herpes simplex virus
(HSV) infections?

• A) Acyclovir
• B) Oseltamivir
• C) Foscarnet
• D) Rimantadine
Answer: A) Acyclovir
Explanation: Acyclovir is a guanosine analog that inhibits viral DNA polymerase.



Section 6: Clinical Scenarios and Advanced Applications



12. A 35-year-old woman presents with a UTI caused by ESBL-producing E. coli.
Which antibiotic is most appropriate?

• A) Trimethoprim-sulfamethoxazole
• B) Nitrofurantoin
• C) Meropenem
• D) Azithromycin
Answer: C) Meropenem
Explanation: Carbapenems are the treatment of choice for extended-spectrum beta-
lactamase (ESBL)-producing bacteria.

13. A 55-year-old male with a history of atrial fibrillation is prescribed clarithromycin
for pneumonia. What potential drug interaction should be considered?

• A) Warfarin metabolism inhibition
• B) Increased risk of QT prolongation
• C) Decreased digoxin levels
• D) Induction of cytochrome P450 enzymes
Answer: B) Increased risk of QT prolongation
Explanation: Macrolides like clarithromycin can prolong the QT interval, increasing the
risk of arrhythmias.

14. Which antibiotic should be avoided in pregnancy due to the risk of fetal cartilage
toxicity?

• A) Penicillin
• B) Tetracycline
• C) Ciprofloxacin
• D) Azithromycin
Answer: C) Ciprofloxacin
Explanation: Fluoroquinolones can cause fetal cartilage damage and are contraindicated
in pregnancy.