Antimicrobials VI: Protein Synthesis Inhibitors in Microbiology
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Questions and Answers

Which bacterial proteins are targeted by tetracyclines for inhibition?

  • 40S subunit of the ribosome
  • 50S subunit of the ribosome
  • 30S subunit of the ribosome (correct)
  • 60S subunit of the ribosome

What is the main mechanism of action of tetracyclines in inhibiting protein synthesis?

  • Stimulates protein synthesis
  • Prevents transcription of mRNA
  • Blocks addition of amino acids to the growing peptide chain (correct)
  • Inhibits tRNA synthesis

What is a common mechanism of resistance to tetracyclines?

  • Enzymatic inactivation of the antibiotic
  • Interference with bacterial binding sites
  • Increased permeability to the drug (correct)
  • Enhanced protein synthesis

Which adverse effect is associated with tetracyclines in young children?

<p>Bone staining and stunted skeletal development (A)</p> Signup and view all the answers

What effect can tetracyclines have on sun exposure in patients taking them?

<p>Accelerated sunburn leading to blisters (C)</p> Signup and view all the answers

Which parameter is utilized by the new BL/BLI, omadacycline, and eravacycline drugs for their pharmacodynamic action?

<p>$AUC/MIC$ (D)</p> Signup and view all the answers

What is the activity of Plazomicin against beta-lactamase producing isolates?

<p>It is effective against them (D)</p> Signup and view all the answers

Which bacterium is categorized as a serious threat by the CDC due to its resistance levels?

<p>Streptococcus pneumoniae (B)</p> Signup and view all the answers

What is the resistance pattern observed in Streptococcus pneumoniae according to the text?

<p>46.6% resistant to at least one drug (D)</p> Signup and view all the answers

What is the main concern regarding the effectiveness of multivalent vaccines mentioned in the text?

<p>They are ineffective against resistant serotypes (D)</p> Signup and view all the answers

Which infections are categorized as non-invasive for Streptococcus pneumoniae?

<p>Otitis media and sinusitis (C)</p> Signup and view all the answers

Which type of organisms are not indicated for treatment with macrolides?

<p>Enterobacterales (D)</p> Signup and view all the answers

What is the mechanism of action of macrolides like erythromycin and clarithromycin?

<p>Inhibition of protein synthesis by binding to 50S ribosomal RNA (A)</p> Signup and view all the answers

Which adverse effect is commonly associated with erythromycin?

<p>Cholestatic hepatitis (B)</p> Signup and view all the answers

What is the mode of action of lincosamides like clindamycin?

<p>Inhibit protein synthesis by affecting the 50S ribosomal subunit (D)</p> Signup and view all the answers

Which type of bacteria are resistant to clindamycin according to the text?

<p>Enterococci (C)</p> Signup and view all the answers

Which antibiotic is known for causing dose-related anemia, aplastic anemia, and gray baby syndrome?

<p>Chloramphenicol (D)</p> Signup and view all the answers

What is the mechanism of action of oxazolidinones?

<p>Prevents initiation with the 50S ribosomal subunit (B)</p> Signup and view all the answers

Which adverse effect is associated with linezolid?

<p>Joint and muscle pain (B)</p> Signup and view all the answers

What is a common toxicity of aminoglycosides?

<p>Peripheral neuropathy (C)</p> Signup and view all the answers

Which mechanism of resistance is NOT associated with aminoglycosides?

<p>Reduced drug accumulation via efflux pumps (D)</p> Signup and view all the answers

What is a characteristic of aminoglycoside antibiotics that distinguishes them from other protein synthesis inhibitors?

<p>They damage the cytoplasmic membrane (B)</p> Signup and view all the answers

Which aminoglycoside can be used against organisms resistant to Gentamicin and Tobramycin?

<p>Amikacin (A)</p> Signup and view all the answers

What is a significant adverse effect of streptomycin?

<p>Ototoxicity and nephrotoxicity (B)</p> Signup and view all the answers

Which antibiotic is active against all clinically relevant gram-positive cocci, including VRE and MRSA?

<p>Linezolid (C)</p> Signup and view all the answers

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