What is the primary mechanism of action of beta-lactam antibiotics?
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| 1 | What is the primary mechanism of action of beta-lactam antibiotics? |
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Drug classes, modes of action, and resistance patterns of antimicrobials used to treat infections.
Beta-lactam antibiotics inhibit bacterial cell wall synthesis by binding to penicillin-binding proteins (PBPs), leading to cell lysis. |
| Think 'PBP' and 'wall synthesis'. |
| 2 | Name two major classes of antibiotics that inhibit protein synthesis in bacteria. | Aminoglycosides and tetracyclines inhibit bacterial protein synthesis by binding to the 30S ribosomal subunit; macrolides and chloramphenicol bind to the 50S subunit. | Remember '30S' vs. '50S' in ribosomal binding. |
| 3 | Which class of antimicrobials targets the bacterial folic acid synthesis pathway? | Sulfonamides and trimethoprim inhibit bacterial folic acid synthesis at different steps, acting synergistically as 'TMP-SMX'. | Think 'folic acid' pathway inhibitors. |
| 4 | What is the mechanism of action of fluoroquinolones? | Fluoroquinolones inhibit bacterial DNA gyrase and topoisomerase IV, enzymes critical for DNA replication and supercoiling. | Remember 'G' for DNA Gyrase. |
| 5 | Which antimicrobial class is primarily used to treat mycobacterial infections like tuberculosis? | First-line agents include isoniazid, rifampin, ethambutol, and pyrazinamide, targeting mycobacterial cell wall synthesis and DNA processes. | Think 'TB' treatment combo. |
| 6 | How do polymyxins (e.g., colistin) exert their antimicrobial effect? | Polymyxins disrupt bacterial outer membrane integrity by interacting with phospholipids, leading to increased permeability and cell death. | Consider 'membrane disruption'. |
| 7 | What are the common resistance mechanisms bacteria develop against beta-lactam antibiotics? | Production of beta-lactamases (enzymes that hydrolyze the beta-lactam ring), alteration of PBPs, and efflux pump overexpression. | Think 'beta-lactamase' as the main resistance enzyme. |
| 8 | Which antimicrobial agents are classified as bacteriostatic rather than bactericidal? | Tetracyclines, sulfonamides, chloramphenicol, and macrolides are primarily bacteriostatic, inhibiting bacterial growth rather than killing bacteria outright. | Static = stop growth; Cidal = kill. |
| 9 | What is the main mechanism by which bacteria develop resistance to aminoglycosides? | Modification of the drug via aminoglycoside-modifying enzymes (acetylation, phosphorylation, adenylation) reduces binding to the bacterial ribosome. | Think 'enzymes' that deactivate the drug. |
| 10 | Which class of antibiotics is associated with risk of causing Clostridioides difficile infection? | Broad-spectrum antibiotics like clindamycin, cephalosporins, and fluoroquinolones are associated with increased risk of CDI. | Remember 'C. difficile' and 'broad-spectrum'. |
| 11 | What is the primary mechanism of resistance to macrolides? | Bacterial resistance occurs via methylation of the 23S rRNA in the 50S ribosomal subunit, preventing drug binding. | Think 'methylation' and 'ribosome'. |
| 12 | Name an antimicrobial that inhibits bacterial cell wall synthesis and is effective against MRSA. | Vancomycin inhibits peptidoglycan synthesis and is effective against MRSA strains. | V for Vancomycin and 'Wall'. |
| 13 | Which class of antifungal agents targets ergosterol synthesis? | Azoles (e.g., fluconazole, itraconazole) inhibit fungal cytochrome P450 enzymes involved in ergosterol synthesis. | Think 'ergosterol' — fungal cholesterol. |
| 14 | What is the main resistance mechanism against vancomycin in enterococci? | Alteration of the D-Ala-D-Ala target to D-Ala-D-Lac or D-Ala-D-Ser reduces vancomycin binding, leading to resistance. | Target modification. |
| 15 | Which antimicrobial class is used to treat atypical bacteria like Mycoplasma and Chlamydia? | Macrolides (e.g., azithromycin), tetracyclines, and fluoroquinolones are effective because these bacteria lack cell walls and are resistant to beta-lactams. | Atypical = 'no wall'; use 'macrolides' or 'tetracyclines'. |
| 16 | Why are beta-lactamase inhibitors combined with beta-lactam antibiotics? | Beta-lactamase inhibitors (e.g., clavulanic acid) inhibit bacterial beta-lactamases, preventing the degradation of beta-lactam antibiotics, thus restoring efficacy. | Think 'inhibitors' protecting the antibiotic. |
| 17 | What is the main adverse effect associated with aminoglycosides? | Nephrotoxicity and ototoxicity are the primary adverse effects of aminoglycosides. | N for Nephrotoxicity. |
| 18 | Which antimicrobial agents are associated with causing QT prolongation? | Macrolides (e.g., erythromycin), fluoroquinolones (e.g., moxifloxacin), and certain antifungals (e.g., voriconazole) can prolong QT interval. | Think 'Q' for QT prolongation. |
| 19 | What is the primary mechanism of resistance to sulfonamides? | Mutations in dihydropteroate synthase reduce drug binding, leading to resistance. | Target enzyme mutation. |
| 20 | Which antimicrobial class is often used for multidrug-resistant tuberculosis? | Second-line agents include fluoroquinolones (e.g., moxifloxacin) and injectable agents like amikacin. | Think 'second-line TB drugs'. |
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