Study "Antibiotics II", a flashcard deck on FORKSAI.
Which of the following describes the primary mechanism of action for Aminoglycosides?
A. Aminoglycosides bind to the 30S subunit of the bacterial ribosome, leading to irreversible inhibition of the initiation complex and misreading of mRNA, ultimately causing cell death.
Which of the following is a key characteristic of bacteriostatic agents?
C. They require cooperation from the patient's immune system for bacterial elimination. Bacteriostatic agents inhibit bacterial growth, allowing the host's immune system to clear the infection.
Which of the following antibiotics is known to cause ototoxicity and vestibulotoxicity, with gentamycin specifically linked to vertigo and ataxia?
B. Aminoglycosides. This class of antibiotics, including gentamycin and streptomycin, is well-documented for causing these inner ear-related side effects.
Tetracyclines exert their bacteriostatic effect by which of the following mechanisms?
D. They bind to the 30S ribosomal subunit, blocking aminoacyl-tRNA from binding to the ribosome acceptor site, thereby inhibiting bacterial protein synthesis.
Which of the following macrolides is known for its longer half-life and complete absorption, often used in dual therapy with ceftriaxone for N. gonorrhoeae?
B. Azithromycin. The source notes indicate azithromycin has a longer half-life and complete absorption compared to erythromycin, and is used in dual therapy for N. gonorrhoeae.
Which of the following adverse effects is specifically associated with Chloramphenicol and is related to impaired glucuronic acid conjugation in neonates?
C. Gray baby syndrome. This severe and potentially fatal condition is a known side effect of chloramphenicol, particularly in newborns due to their underdeveloped glucuronidation system.
Clindamycin, a lincosamide, is primarily metabolized in the liver by which cytochrome P450 enzymes?
A. CYP3A4 and CYP3A5. The source notes state that clindamycin is primarily metabolized by CYP3A4 (major) and CYP3A5.
Which of the following antibiotics is effective against MRSA and VRE, but has little activity against Enterobacteriaceae and Pseudomonas aeruginosa, and can cause serotonin syndrome due to nonselective monoamine oxidase inhibition?
D. Linezolid. Linezolid's spectrum and adverse effects, including serotonin syndrome, are consistent with the description provided in the source notes for Oxazolidinones.
Mupirocin's unique mechanism of action, which prevents bacterial protein synthesis by competing with isoleucine for binding to isoleucyl tRNA synthetase, results in which of the following benefits?
C. It does not exhibit cross-resistance with other antimicrobial drugs. Its distinct mechanism of action minimizes the development of cross-resistance.
Which of the following classes of antibiotics is generally bacteriostatic but can be bactericidal in some newer forms and is an alternative for patients with penicillin allergy?
B. Macrolides. The notes indicate macrolides are bacteriostatic, with some modern ones being bactericidal, and are an alternative for penicillin allergy.