GPT- Antibiotics Flashcards
Which antibiotic is a DNA gyrase inhibitor?
A) Trimethoprim
B) Quinolones
C) Sulfonamides
D) Bacitracin
B) Quinolones
Trimethoprim is an inhibitor of which enzyme?
A) DNA gyrase
B) DHF reductase
C) Reverse transcriptase
D) Bio synthetic pathways
B) DHF reductase
Which of the following antibiotics inhibits the enzyme PABA?
A) Zidovudine
B) Sulfonamides
C) Amphotericin B
D) Polymyxin B
B) Sulfonamides
Zidovudine is known to inhibit which enzyme?
A) Cell wall permeability
B) Reverse transcriptase
C) DHF reductase
D) DNA gyrase
B) Reverse transcriptase
Amphotericin B and Polymyxin B affect which cellular component?
A) DNA gyrase
B) DHF reductase
C) Cell wall permeability
D) Bio synthetic pathways
C) Cell wall permeability
Bacitracin is an inhibitor of which of the following?
A) Inhibitors of bio synthetic pathways
B) DNA gyrase inhibitors
C) DHF reductase inhibitor
D) Cell wall permeability
A) Inhibitors of bio synthetic pathways
What is the mechanism of resistance for β-lactams?
A) Active efflux from the cell
B) Hydrolysis, mutant PBP
C) Binding by immunity protein
D) RNA methylation, drug efflux
B) Hydrolysis, mutant PBP
Tetracycline resistance is primarily due to which process?
A) Overproduction of target
B) Active efflux from the cell
C) Inactivation by enzymes
D) Mutant DNA gyrase
B) Active efflux from the cell
How do bacteria commonly resist aminoglycosides?
A) Mutant DNA gyrase
B) Ribosomal methylation
C) Inactivation by enzymes
D) Reduced uptake into cell
C) Inactivation by enzymes
Resistance to sulfonamides is often due to what?
A) Reprogramming of D-ala-D-ala
B) Overproduction of target
C) Binding by immunity protein
D) Active efflux from the cell
B) Overproduction of target
Which mechanism leads to fluoroquinolones resistance?
A) Overproduction of target
B) Mutant DNA gyrase
C) Reduced uptake into cell
D) Hydrolysis, mutant PBP
B) Mutant DNA gyrase
Bleomycin resistance is achieved by what means?
A) Reduced uptake into cell
B) Binding by immunity protein
C) Ribosomal methylation
D) Active efflux from the cell
B) Binding by immunity protein
Chloramphenicol resistance occurs due to which process?
A) Reprogramming of D-ala-D-ala
B) RNA methylation, drug efflux
C) Reduced uptake into cell
D) Inactivation by enzymes
C) Reduced uptake into cell
Vancomycin resistance is characterized by which of the following?
A) Mutant DNA gyrase
B) Ribosomal methylation
C) Reprogramming of D-ala-D-ala
D) Binding by immunity protein
C) Reprogramming of D-ala-D-ala
Resistance to Quinupristin/Dalfopristin is achieved through:
A) Reduced uptake into cell
B) Ribosomal methylation
C) Inactivation by enzymes
D) Active efflux from the cell
B) Ribosomal methylation
What is the resistance mechanism for macrolides like Erythromycin?
A) Overproduction of target
B) RNA methylation, drug efflux
C) Binding by immunity protein
D) Reprogramming of D-ala-D-ala
B) RNA methylation, drug efflux
Sulfamethoxazole is primarily used for:
A. Burn
B. Nocardiosis
C. UTI
D. Ulcerative colitis
E. Ocular infection
F. Toxoplasmosis
C. UTI
Sulfasalazine is primarily used for:
A. Burn
B. Nocardiosis
C. UTI
D. Ulcerative colitis
E. Ocular infection
F. Toxoplasmosis
D. Ulcerative colitis
Silver sulfadiazine is primarily used for:
A. Burn
B. Nocardiosis
C. UTI
D. Ulcerative colitis
E. Ocular infection
F. Toxoplasmosis
A. Burn
Sulfacetamide is primarily used for:
A. Burn
B. Nocardiosis
C. UTI
D. Ulcerative colitis
E. Ocular infection
F. Toxoplasmosis
E. Ocular infection
Sulfisoxazole is primarily used for:
A. Burn
B. Nocardiosis
C. UTI
D. Ulcerative colitis
E. Ocular infection
F. Toxoplasmosis
B. Nocardiosis
Sulfadiazine + pyrimethamine is primarily used for:
A. Burn
B. Nocardiosis
C. UTI
D. Ulcerative colitis
E. Ocular infection
F. Toxoplasmosis
F. Toxoplasmosis
How does Amphotericin B work to treat fungal infections?
A) Inhibits DNA synthesis
B) Binds to ergosterol and creates pores in fungal cell membranes
C) Inhibits microtubule function
D) Blocks thymidylate synthetase
B) Binds to ergosterol and creates pores in fungal cell membranes
The mechanism of action for Flucytosine is:
A) Impairing the fungal cell membrane integrity
B) Inhibiting fungal cell wall synthesis
C) Inhibiting DNA and RNA synthesis by interfering with thymidylate synthetase
D) Disrupting microtubules within the fungal cells
C) Inhibiting DNA and RNA synthesis by interfering with thymidylate synthetase
Ketoconazole’s antifungal activity is primarily due to its ability to:
A) Inhibit DNA replication
B) Block cell wall beta-glucan synthesis
C) Inhibit ergosterol synthesis
D) Impair mitotic spindle formation
C) Inhibit ergosterol synthesis
Griseofulvin works against fungal infections by:
A) Competing with ergosterol
B) Inhibiting fungal microtubule function
C) Blocking the absorption of other antifungal agents
D) Disrupting fungal DNA synthesis
B) Inhibiting fungal microtubule function
Identify the category of the anti-fungal drugs:
a. Superficial Mycosis
b. Systemic Mycosis
c. Both
a. Superficial Mycosis
Identify the category of the anti-fungal drugs:
a. Superficial Mycosis
b. Systemic Mycosis
c. Both
b. Systemic Mycosis
Identify the category of the anti-fungal drugs:
a. Superficial Mycosis
b. Systemic Mycosis
c. Both
c. Both
What is the drug of choice for systemic mycotic infections?
A) Ketoconazole
B) Fluconazole
C) Amphotericin B
D) Griseofulvin
C) Amphotericin B
Which antifungal is the drug of choice for cryptococcal meningitis in AIDS patients?
A) Itraconazole
B) Amphotericin B
C) Fluconazole
D) Flucytosine
C) Fluconazole
The drug of choice for subcutaneous chromomycosis is:
A) Flucytosine
B) Griseofulvin
C) Itraconazole
D) Ketoconazole
C) Itraconazole
Which antifungal drug is associated with nephrotoxicity?
A) Flucytosine
B) Ketoconazole
C) Itraconazole
D) Amphotericin B
D) Amphotericin B
Nephrotoxicity
Hypotension
Arrhythmias
Neurologic effects
Fever
Hypochromic, normocytic anemia
Reversible bone marrow depression is a side effect of which drug?
A) Amphotericin B
B) Flucytosine
C) Ketoconazole
D) Itraconazole
B) Flucytosine
Reversible bone marrow depression
Increased hepatic enzymes
Nausea, vomiting, diarrhea