Antibiotics Spectrum Quiz
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Questions and Answers

What is the effect of a 4-methyl group on beta lactamases and gram negative bacteria activity?

  • Decreases stability to beta lactamases and activity against gram positive bacteria
  • Decreases stability to beta lactamases and activity against gram negative bacteria
  • Increases stability to beta lactamases and activity against gram positive bacteria
  • Increases stability to beta lactamases and activity against gram negative bacteria (correct)
  • What is the impact of a 4,4-Gem-dimethyl substitution on antibacterial potency after oral administration?

  • Greatly enhances antibacterial potency
  • Significantly increases antibacterial potency
  • Slightly decreases antibacterial potency (correct)
  • Does not affect antibacterial potency
  • Which penicillin binding protein does Aztreonam preferentially bind to?

  • PBP-2
  • PBP-3 (correct)
  • PBP-4
  • PBP-1
  • What is the excretory route of Aztreonam disodium for about 70% of the administered dose?

    <p>Urinary excretion</p> Signup and view all the answers

    Which type of infections is Aztreonam primarily used to treat?

    <p>Upper and lower respiratory tract infections</p> Signup and view all the answers

    What is the absorption rate of an orally administered dose of Aztreonam?

    <p>Less than 1%</p> Signup and view all the answers

    What is the main reason meropenem is not used in meningitis?

    <p>It causes seizures</p> Signup and view all the answers

    Which bacteria are carbapenems NOT active against?

    <p>Methicillin-resistant staphylococci</p> Signup and view all the answers

    What structural feature of carbapenems contributes to their stability against beta-lactamase enzymes?

    <p>Inverse stereochemistry at C6</p> Signup and view all the answers

    Which carbapenem exhibits a longer half-life due to increased binding to plasma proteins?

    <p><em>Ertapenem</em></p> Signup and view all the answers

    Which carbapenem is commonly used in combination with cilastatin and now available in a triple-drug product with relebactam?

    <p><em>Ertapenem</em></p> Signup and view all the answers

    Which of the following statements about carbapenems is false?

    <p><em>Doripenem</em> has increased binding to plasma proteins</p> Signup and view all the answers

    Which of the following cephalosporins is NOT active against S.aureus for skin and soft tissue infections?

    <p>Cefoperazone</p> Signup and view all the answers

    Which antibiotic is effective against Pseudomonas aeruginosa but lacks significant gram-positive activity?

    <p>Ceftibuten</p> Signup and view all the answers

    Which cephalosporin is the first orally active, 3rd generation cephalosporin that is not an ester prodrug approved for therapy in the US?

    <p>Cefexime</p> Signup and view all the answers

    Which cephalosporin has a broad spectrum, resistant to many beta lactamases, and used for respiratory tract infections, otitis media, uncomplicated UTI, and gonorrhea caused by beta lactamase-producing strains?

    <p>Ceftriaxone</p> Signup and view all the answers

    Which cephalosporin has broad spectrum activity against both Gram-positive and Gram-negative bacteria and is considered equivalent to ceftriaxone in safety and efficacy?

    <p>Cefotaxime</p> Signup and view all the answers

    Which antibiotic, when combined with avibactam, extends its spectrum to include Enterobacteriaceae producing AmpC, ESBL, or KPC?

    <p>Ceftazidime</p> Signup and view all the answers

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