Antimicrobials III: The β-Lactams Quiz
47 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

Which of the following classes of antibiotics contain a thiazolidine ring?

  • Penicillins (correct)
  • Carbapenems
  • Monobactams
  • Cephalosporins
  • Which antibiotic is a part of the extended-spectrum Penicillins?

  • Ampicillin (correct)
  • Oxacillin
  • Methicillin
  • Naficillin
  • What is the mode of action of β-lactam antibiotics?

  • Inhibit protein synthesis
  • Inhibit cell membrane synthesis
  • Inhibit nucleic acid synthesis
  • Inhibit cell wall synthesis (correct)
  • Which antibiotic is commonly used in combination with sulbactam?

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

    Among the listed antibiotics, which one is NOT a β-lactam antibiotic?

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

    Which component in peptidoglycan do β-lactam antibiotics target?

    <p>N-acetylmuramic acid</p> Signup and view all the answers

    What is the main function of PBP1 in bacterial cells?

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

    Which type of penicillin is known for its activity against methicillin-sensitive Staphylococcus aureus (MSSA)?

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

    Which generation of penicillins has basic gram-negative coverage?

    <p>3rd Generation</p> Signup and view all the answers

    What is the main characteristic of extended-spectrum penicillins like Ampicillin and Amoxicillin?

    <p>Inactivation by β-lactamases</p> Signup and view all the answers

    Which type of bacteria are anti-staphylococcal penicillins NOT active against?

    <p>Anaerobic bacteria</p> Signup and view all the answers

    What is the common mechanism of resistance observed in N.gonorrhoeae against Penicillins?

    <p>Hydrolysis by β-lactamases</p> Signup and view all the answers

    Which penicillin has an improved activity against Gram-negative organisms, including Pseudomonas?

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

    What is the main mechanism by which extended-spectrum penicillins like ticarcillin and piperacillin are inactivated?

    <p>Hydrolysis by β-lactamases</p> Signup and view all the answers

    Which drug competes for tubular secretion with penicillins, leading to decreased renal excretion?

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

    What is the approximate percentage of the population that reports an allergy to penicillins?

    <p>~10%</p> Signup and view all the answers

    Which type of antibiotics are cephalosporins and cephamycins in relation to penicillins?

    <p>Synthetic analogs</p> Signup and view all the answers

    In terms of pharmacodynamics, which parameter refers to the time the drug concentration remains above the minimum inhibitory concentration (MIC)?

    <p>$T &gt;$ MIC</p> Signup and view all the answers

    Which drug uses a siderophore mechanism for unique entry compared to other β-lactams?

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

    What is the primary advantage of Cefiderocol's entry mechanism compared to other β-lactams?

    <p>Active transport through iron transport system</p> Signup and view all the answers

    Which bacteria show the highest MIC range for Cefiderocol among the listed pathogens?

    <p>MDR P. aeruginosa</p> Signup and view all the answers

    Which pharmacodynamic parameter indicates the rate at which a drug kills bacteria and varies between different antibiotic classes?

    <p>Net bactericidal effect</p> Signup and view all the answers

    What is the primary function of penicillin binding proteins (PBPs) in bacterial cells?

    <p>Inhibiting cell wall synthesis</p> Signup and view all the answers

    Which generation of cephalosporins includes Cefepime among its members?

    <p>4th Generation</p> Signup and view all the answers

    What is the primary differentiating factor between Monobactams and other -lactam antibiotics?

    <p>Absence of a thiazolidine ring</p> Signup and view all the answers

    Which antibiotic is known for its pronounced activity against Pseudomonas aeruginosa?

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

    What is the primary characteristic of carbapenems compared to other -lactam antibiotics?

    <p>Resistance to -lactamase enzymes</p> Signup and view all the answers

    Which structure plays a crucial role in the mode of action of -lactam antibiotics?

    <p>$\beta$-lactam bond</p> Signup and view all the answers

    Among the listed combinations, which one pairs a cephalosporin with avibactam?

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

    Which fundamental component of peptidoglycan is targeted by -lactam antibiotics?

    <p>$\delta$-N-acetylmuramic acid</p> Signup and view all the answers

    What is the primary mechanism by which extended-spectrum penicillins are enhanced to penetrate the outer membrane of Gram-negative bacteria?

    <p>Inactivation by beta-lactamases</p> Signup and view all the answers

    What is the primary reason for using cephalosporins and cephamycins as alternatives to penicillins?

    <p>Presence of two side chains instead of one</p> Signup and view all the answers

    Which antibiotic class shows some cross-allergy ranging from 5-15% with penicillins?

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

    What is a characteristic feature of carbapenems in terms of pharmacodynamics?

    <p>Time above the minimum inhibitory concentration (T&gt;MIC) of 20%</p> Signup and view all the answers

    Which aspect makes Cefiderocol unique compared to other beta-lactams regarding its entry mechanism?

    <p>Active transport through iron transport system</p> Signup and view all the answers

    Which pharmacodynamic parameter indicates the rate at which a drug kills bacteria and varies significantly between different antibiotic classes?

    <p>(T&gt;MIC) = 60-70%</p> Signup and view all the answers

    What is the primary function of siderophores in bacterial cells when targeted by drugs like Cefiderocol?

    <p>Bind iron with high affinity to solubilize Fe3+ in the environment</p> Signup and view all the answers

    Which penicillin is known for its specific activity against Streptococci and oral anaerobes?

    <p>Penicillin V</p> Signup and view all the answers

    Which generation of penicillins has the highest activity against Pseudomonas aeruginosa?

    <p>4th Generation Expanded-spectrum penicillins</p> Signup and view all the answers

    Which antibiotic is NOT classified as a -lactam antibiotic?

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

    What is the main feature of Anti-staphylococcal penicillins like Methicillin and Nafcillin?

    <p>Effective against MRSA</p> Signup and view all the answers

    Which type of penicillins are subject to hydrolysis by -lactamases in Staphylococcus aureus and Bacteroides fragilis?

    <p>1st Generation Penicillins</p> Signup and view all the answers

    What is the unique feature of Aminopenicillins like Amoxicillin and Ampicillin?

    <p>High activity against gram-negative bacteria</p> Signup and view all the answers

    Which antibiotic is considered an Ureidopenicillin and is particularly effective against Pseudomonas?

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

    In terms of anti-bacterial coverage, which type of bacteria show little sensitivity to extended-spectrum penicillins like Piperacillin?

    <p>Anaerobic bacteria</p> Signup and view all the answers

    Which antibiotic is known for its resistance to -lactamases, rendering it effective against Staphylococcus aureus and streptococci?

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

    Which generation of penicillins has expanded gram-negative coverage but is inactivated by common -lactamases?

    <p>3rd Generation Extended-spectrum penicillins</p> Signup and view all the answers

    More Like This

    Cephalosporins and β-lactam Antibiotics
    10 questions
    Penicillin Flashcards
    18 questions
    Use Quizgecko on...
    Browser
    Browser