Pharmacology Antibiotics — Practice Exam
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1. Which antibiotic is generally considered a first-line treatment for
infections caused by susceptible Streptococcus species?
A. Gentamicin
B. Penicillin G
C. Vancomycin
D. Ciprofloxacin
Rationale: Penicillin G is highly effective against many susceptible
Streptococcus species because it inhibits bacterial cell-wall synthesis.
Resistance patterns and infection site should always be considered
when selecting therapy.
2. What is the primary mechanism of action of beta-lactam
antibiotics?
,A. Inhibition of bacterial DNA replication
B. Inhibition of bacterial protein synthesis
C. Inhibition of bacterial cell-wall synthesis
D. Disruption of bacterial folic acid metabolism
Rationale: Beta-lactams bind to penicillin-binding proteins and
interfere with peptidoglycan cross-linking, weakening the bacterial
cell wall and ultimately causing bacterial lysis.
3. Which antibiotic is classified as a macrolide?
A. Amoxicillin
B. Ceftriaxone
C. Azithromycin
D. Gentamicin
Rationale: Azithromycin is a macrolide that binds to the 50S ribosomal
subunit and inhibits bacterial protein synthesis. Other macrolides
include erythromycin and clarithromycin.
4. Which antibiotic is associated with a risk of nephrotoxicity and
ototoxicity?
A. Amoxicillin
B. Azithromycin
,C. Gentamicin
D. Clindamycin
Rationale: Gentamicin is an aminoglycoside that can cause kidney
injury and damage to the auditory or vestibular systems. Monitoring
renal function and, when appropriate, drug levels is important during
therapy.
5. Which antibiotic is commonly used to treat infections caused by
methicillin-resistant Staphylococcus aureus (MRSA)?
A. Penicillin V
B. Amoxicillin
C. Vancomycin
D. Cephalexin
Rationale: Vancomycin is an important treatment option for serious
infections caused by susceptible MRSA strains. It inhibits bacterial cell-
wall synthesis and is administered intravenously for many systemic
infections.
6. Which adverse effect is particularly associated with clindamycin?
A. Tendon rupture
B. Hearing loss
, C. Clostridioides difficile-associated diarrhea
D. Severe hypoglycemia
Rationale: Clindamycin has a significant association with C. difficile
infection because it can substantially disrupt normal intestinal flora.
Patients should report significant or persistent diarrhea during or
after treatment.
7. Which antibiotic class works primarily by inhibiting bacterial
protein synthesis at the 30S ribosomal subunit?
A. Macrolides
B. Penicillins
C. Aminoglycosides
D. Sulfonamides
Rationale: Aminoglycosides such as gentamicin and amikacin bind to
the 30S ribosomal subunit, interfering with bacterial protein synthesis.
They are bactericidal and can cause nephrotoxicity and ototoxicity.
8. Which antibiotic inhibits bacterial protein synthesis by binding to
the 50S ribosomal subunit?
A. Gentamicin
B. Ciprofloxacin
Questions and Correct Answers (Verified
Answers) Plus Rationale 2027 Q&A| Instant
Download Pdf
1. Which antibiotic is generally considered a first-line treatment for
infections caused by susceptible Streptococcus species?
A. Gentamicin
B. Penicillin G
C. Vancomycin
D. Ciprofloxacin
Rationale: Penicillin G is highly effective against many susceptible
Streptococcus species because it inhibits bacterial cell-wall synthesis.
Resistance patterns and infection site should always be considered
when selecting therapy.
2. What is the primary mechanism of action of beta-lactam
antibiotics?
,A. Inhibition of bacterial DNA replication
B. Inhibition of bacterial protein synthesis
C. Inhibition of bacterial cell-wall synthesis
D. Disruption of bacterial folic acid metabolism
Rationale: Beta-lactams bind to penicillin-binding proteins and
interfere with peptidoglycan cross-linking, weakening the bacterial
cell wall and ultimately causing bacterial lysis.
3. Which antibiotic is classified as a macrolide?
A. Amoxicillin
B. Ceftriaxone
C. Azithromycin
D. Gentamicin
Rationale: Azithromycin is a macrolide that binds to the 50S ribosomal
subunit and inhibits bacterial protein synthesis. Other macrolides
include erythromycin and clarithromycin.
4. Which antibiotic is associated with a risk of nephrotoxicity and
ototoxicity?
A. Amoxicillin
B. Azithromycin
,C. Gentamicin
D. Clindamycin
Rationale: Gentamicin is an aminoglycoside that can cause kidney
injury and damage to the auditory or vestibular systems. Monitoring
renal function and, when appropriate, drug levels is important during
therapy.
5. Which antibiotic is commonly used to treat infections caused by
methicillin-resistant Staphylococcus aureus (MRSA)?
A. Penicillin V
B. Amoxicillin
C. Vancomycin
D. Cephalexin
Rationale: Vancomycin is an important treatment option for serious
infections caused by susceptible MRSA strains. It inhibits bacterial cell-
wall synthesis and is administered intravenously for many systemic
infections.
6. Which adverse effect is particularly associated with clindamycin?
A. Tendon rupture
B. Hearing loss
, C. Clostridioides difficile-associated diarrhea
D. Severe hypoglycemia
Rationale: Clindamycin has a significant association with C. difficile
infection because it can substantially disrupt normal intestinal flora.
Patients should report significant or persistent diarrhea during or
after treatment.
7. Which antibiotic class works primarily by inhibiting bacterial
protein synthesis at the 30S ribosomal subunit?
A. Macrolides
B. Penicillins
C. Aminoglycosides
D. Sulfonamides
Rationale: Aminoglycosides such as gentamicin and amikacin bind to
the 30S ribosomal subunit, interfering with bacterial protein synthesis.
They are bactericidal and can cause nephrotoxicity and ototoxicity.
8. Which antibiotic inhibits bacterial protein synthesis by binding to
the 50S ribosomal subunit?
A. Gentamicin
B. Ciprofloxacin
