NURS 5334 Advanced Pharmacology – 200
Antimicrobials Questions and Correct
Answers Latest Guide 2025-2026 / UTA
NURS 5334 Practice test
1. What is the mechanism of action of beta-lactam antibiotics?
• ANSWER--- They inhibit bacterial cell wall synthesis by binding to
penicillin-binding proteins (PBPs). Beta-lactams interfere with the cross-
linking of peptidoglycan chains, weakening the cell wall and causing cell
lysis.
2. Which class of antimicrobials is known to cause nephrotoxicity and
ototoxicity as significant adverse effects?
• ANSWER--- Aminoglycosides. Aminoglycosides accumulate in renal
tubules and inner ear structures, leading to toxic effects, especially with
prolonged or high-dose therapy.
3. What is the primary bacterial target of macrolides such as erythromycin?
• ANSWER--- 50S ribosomal subunit, inhibiting bacterial protein
synthesis. Macrolides bind reversibly to the 50S subunit, preventing
translocation of the peptide chain, thus inhibiting protein elongation.
4. Why is it important to avoid using bacteriostatic and bactericidal
antibiotics simultaneously?
• ANSWER--- Because bacteriostatic antibiotics inhibit bacterial growth,
which can reduce the efficacy of bactericidal drugs that require actively
dividing bacteria. Bactericidal agents often depend on active cell division
to exert their lethal effects, so combining with bacteriostatic drugs may
antagonize their action.
5. What is the main mechanism by which bacteria develop resistance to
penicillins?
, • ANSWER--- Production of beta-lactamase enzymes that hydrolyze the
beta-lactam ring. Beta-lactamases break the beta-lactam ring structure
essential for antibacterial activity, rendering penicillins ineffective.
6. Which antibiotic is the drug of choice for treating methicillin-resistant
Staphylococcus aureus (MRSA)?
• ANSWER--- Vancomycin. Vancomycin inhibits cell wall synthesis by
binding to D-Ala-D-Ala terminal of peptidoglycan precursors, effective
against MRSA strains resistant to beta-lactams.
7. What class of antibiotics does ciprofloxacin belong to?
• ANSWER--- Fluoroquinolones. Fluoroquinolones inhibit bacterial DNA
gyrase and topoisomerase IV, enzymes critical for DNA replication and
repair.
8. What adverse effect is commonly associated with the use of
fluoroquinolones?
• ANSWER--- Tendinitis and tendon rupture. Fluoroquinolones can cause
damage to collagen fibers in tendons, increasing risk especially in older
adults or those on corticosteroids.
9. Which antibiotic requires therapeutic drug monitoring to avoid toxicity?
• ANSWER--- Vancomycin. Due to its narrow therapeutic index and
nephrotoxicity risk, serum levels of vancomycin are monitored to optimize
dosing and minimize harm.
10. What is the mechanism of action of sulfonamides?
• ANSWER--- They inhibit bacterial folic acid synthesis by competitively
inhibiting dihydropteroate synthase. Bacteria need folic acid for nucleic
acid synthesis; sulfonamides block this pathway, leading to bacterial growth
inhibition.
11. What adverse effect is commonly associated with sulfonamide use?
• ANSWER--- Stevens-Johnson syndrome (SJS). SJS is a severe
hypersensitivity reaction presenting with skin and mucous membrane
blistering, a rare but serious side effect.
, 12. Which antibiotic is contraindicated in children under 8 years due to effects
on teeth and bone development?
• ANSWER--- Tetracyclines. Tetracyclines chelate calcium and become
incorporated into developing teeth and bones, causing discoloration and
growth inhibition.
13. How do beta-lactamase inhibitors like clavulanic acid work?
• ANSWER--- They bind to and inhibit beta-lactamase enzymes,
protecting beta-lactam antibiotics from degradation. This allows beta-
lactam antibiotics to remain active against beta-lactamase-producing
bacteria.
14. What is the mechanism of action of daptomycin?
• ANSWER--- It inserts into the bacterial cell membrane, causing rapid
depolarization and cell death. Daptomycin is calcium-dependent and
active against Gram-positive bacteria including MRSA and VRE.
15. Which antibiotic causes red man syndrome (flushing, rash, pruritus) when
infused too rapidly?
• ANSWER--- Vancomycin. Rapid infusion releases histamine; prevention
includes prolonging infusion time to at least 60 minutes and pretreatment
with antihistamines.
16. What is the primary toxicity of linezolid when used for more than 28 days?
• ANSWER--- Myelosuppression (thrombocytopenia, anemia,
leukopenia). Reversible upon discontinuation; weekly complete blood count
monitoring is recommended.
17. Which antimicrobial class is associated with gray baby syndrome in
newborns?
• ANSWER--- Chloramphenicol. Newborns lack adequate glucuronyl
transferase, leading to drug accumulation and cardiovascular collapse.
18. What is the mechanism of action of metronidazole?
• ANSWER--- It forms toxic free radicals that damage bacterial
DNA. Metronidazole is reduced by bacterial nitroreductases, producing
cytotoxic intermediates active against anaerobes and some protozoa.
Antimicrobials Questions and Correct
Answers Latest Guide 2025-2026 / UTA
NURS 5334 Practice test
1. What is the mechanism of action of beta-lactam antibiotics?
• ANSWER--- They inhibit bacterial cell wall synthesis by binding to
penicillin-binding proteins (PBPs). Beta-lactams interfere with the cross-
linking of peptidoglycan chains, weakening the cell wall and causing cell
lysis.
2. Which class of antimicrobials is known to cause nephrotoxicity and
ototoxicity as significant adverse effects?
• ANSWER--- Aminoglycosides. Aminoglycosides accumulate in renal
tubules and inner ear structures, leading to toxic effects, especially with
prolonged or high-dose therapy.
3. What is the primary bacterial target of macrolides such as erythromycin?
• ANSWER--- 50S ribosomal subunit, inhibiting bacterial protein
synthesis. Macrolides bind reversibly to the 50S subunit, preventing
translocation of the peptide chain, thus inhibiting protein elongation.
4. Why is it important to avoid using bacteriostatic and bactericidal
antibiotics simultaneously?
• ANSWER--- Because bacteriostatic antibiotics inhibit bacterial growth,
which can reduce the efficacy of bactericidal drugs that require actively
dividing bacteria. Bactericidal agents often depend on active cell division
to exert their lethal effects, so combining with bacteriostatic drugs may
antagonize their action.
5. What is the main mechanism by which bacteria develop resistance to
penicillins?
, • ANSWER--- Production of beta-lactamase enzymes that hydrolyze the
beta-lactam ring. Beta-lactamases break the beta-lactam ring structure
essential for antibacterial activity, rendering penicillins ineffective.
6. Which antibiotic is the drug of choice for treating methicillin-resistant
Staphylococcus aureus (MRSA)?
• ANSWER--- Vancomycin. Vancomycin inhibits cell wall synthesis by
binding to D-Ala-D-Ala terminal of peptidoglycan precursors, effective
against MRSA strains resistant to beta-lactams.
7. What class of antibiotics does ciprofloxacin belong to?
• ANSWER--- Fluoroquinolones. Fluoroquinolones inhibit bacterial DNA
gyrase and topoisomerase IV, enzymes critical for DNA replication and
repair.
8. What adverse effect is commonly associated with the use of
fluoroquinolones?
• ANSWER--- Tendinitis and tendon rupture. Fluoroquinolones can cause
damage to collagen fibers in tendons, increasing risk especially in older
adults or those on corticosteroids.
9. Which antibiotic requires therapeutic drug monitoring to avoid toxicity?
• ANSWER--- Vancomycin. Due to its narrow therapeutic index and
nephrotoxicity risk, serum levels of vancomycin are monitored to optimize
dosing and minimize harm.
10. What is the mechanism of action of sulfonamides?
• ANSWER--- They inhibit bacterial folic acid synthesis by competitively
inhibiting dihydropteroate synthase. Bacteria need folic acid for nucleic
acid synthesis; sulfonamides block this pathway, leading to bacterial growth
inhibition.
11. What adverse effect is commonly associated with sulfonamide use?
• ANSWER--- Stevens-Johnson syndrome (SJS). SJS is a severe
hypersensitivity reaction presenting with skin and mucous membrane
blistering, a rare but serious side effect.
, 12. Which antibiotic is contraindicated in children under 8 years due to effects
on teeth and bone development?
• ANSWER--- Tetracyclines. Tetracyclines chelate calcium and become
incorporated into developing teeth and bones, causing discoloration and
growth inhibition.
13. How do beta-lactamase inhibitors like clavulanic acid work?
• ANSWER--- They bind to and inhibit beta-lactamase enzymes,
protecting beta-lactam antibiotics from degradation. This allows beta-
lactam antibiotics to remain active against beta-lactamase-producing
bacteria.
14. What is the mechanism of action of daptomycin?
• ANSWER--- It inserts into the bacterial cell membrane, causing rapid
depolarization and cell death. Daptomycin is calcium-dependent and
active against Gram-positive bacteria including MRSA and VRE.
15. Which antibiotic causes red man syndrome (flushing, rash, pruritus) when
infused too rapidly?
• ANSWER--- Vancomycin. Rapid infusion releases histamine; prevention
includes prolonging infusion time to at least 60 minutes and pretreatment
with antihistamines.
16. What is the primary toxicity of linezolid when used for more than 28 days?
• ANSWER--- Myelosuppression (thrombocytopenia, anemia,
leukopenia). Reversible upon discontinuation; weekly complete blood count
monitoring is recommended.
17. Which antimicrobial class is associated with gray baby syndrome in
newborns?
• ANSWER--- Chloramphenicol. Newborns lack adequate glucuronyl
transferase, leading to drug accumulation and cardiovascular collapse.
18. What is the mechanism of action of metronidazole?
• ANSWER--- It forms toxic free radicals that damage bacterial
DNA. Metronidazole is reduced by bacterial nitroreductases, producing
cytotoxic intermediates active against anaerobes and some protozoa.
