USMLE EXAM PREP TEST BANK VERIFIED
QUESTIONS AND CORRECT ANSWERS
●● clindamycin, chloramphenicol
Answer: 50 ribosome, inhibits PEPTIDYL TRANSFERASE
(incorporation of new a.a.'s into growing strand)
●● linezolid
Answer: 50S protein synthesis inhibitor
●● tetracycline
Answer: 30S ribosome, blocks tRNA-aa from binding to ACCEPTOR
SITE on mRNA
●● aminoglycosides
Answer: 30S ribosome, blocks INITIATION of translation and induces
PREMATURE TERMINATION or mistranslation
●● vancomycin
Answer: binds D-ala-D-ala portion of cell wall precursors, prevents
POLYMERIZATION OF PEPTIDOGLYCANS
●● cephalosporins
, Answer: beta-lactam, with with some resistance to penicillinase
●● ampicillin, amoxicillin
Answer: beta-lactam, broader spectrum but still susceptible to
penicillinase
●● ticarcillin, piperacillin
Answer: beta-lactam, broad-spectrum
●● rifampin
Answer: blocks mRNA transcription by inhibiting mRNA
POLYMERASE beta subunit
●● metronidazole
Answer: interacts with microbial ferredoxins to produce CYTOTOXIC
INTERMEDIATES
●● fluoroquinolones
Answer: inhibits DNA GYRASE (controls supercoiling) and
TOPOISOMERASE (untangling interlocked daughter chromosomes)
●● trimethroprim
QUESTIONS AND CORRECT ANSWERS
●● clindamycin, chloramphenicol
Answer: 50 ribosome, inhibits PEPTIDYL TRANSFERASE
(incorporation of new a.a.'s into growing strand)
●● linezolid
Answer: 50S protein synthesis inhibitor
●● tetracycline
Answer: 30S ribosome, blocks tRNA-aa from binding to ACCEPTOR
SITE on mRNA
●● aminoglycosides
Answer: 30S ribosome, blocks INITIATION of translation and induces
PREMATURE TERMINATION or mistranslation
●● vancomycin
Answer: binds D-ala-D-ala portion of cell wall precursors, prevents
POLYMERIZATION OF PEPTIDOGLYCANS
●● cephalosporins
, Answer: beta-lactam, with with some resistance to penicillinase
●● ampicillin, amoxicillin
Answer: beta-lactam, broader spectrum but still susceptible to
penicillinase
●● ticarcillin, piperacillin
Answer: beta-lactam, broad-spectrum
●● rifampin
Answer: blocks mRNA transcription by inhibiting mRNA
POLYMERASE beta subunit
●● metronidazole
Answer: interacts with microbial ferredoxins to produce CYTOTOXIC
INTERMEDIATES
●● fluoroquinolones
Answer: inhibits DNA GYRASE (controls supercoiling) and
TOPOISOMERASE (untangling interlocked daughter chromosomes)
●● trimethroprim