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NBME 20 Answers

nbme20/Block 2/Question#39 (26.0 difficulty score)
A 29-year-old man comes to the physician ...
Absence of peptidoglycan🔍
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 +7 
submitted by sinforslide(49),
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ehT qonsetiu mtes si asgnik awht tureesfa eld ot het csteniifenefesv of hrahpatyoacerpm. tPenait's teiponerntas is tesnosctin with palcsoMmya innemaupeo t,inocfein chihw 'osnetd hvea a clle awll nda fheotrere tgi,lopedcnypa ichwh is eht tesi of antoci orf .isienlnlcpi tI sode eruiqer ostrsel orf th,wrog ubt atth d'wtloun inpaxel hwy xnlcomiiali si etiie.fcfvne




 +2 
submitted by neovanilla(35),

Reason why it's not E: While it's true that mycoplasma pneumoniae uses sterols for its cell membrane, it's the lack of a target for amoxicillin (peptidoglycan) that renders it ineffective. Classic test technique where they include a right answer but isn't the correct answer




 +1 
submitted by haliburton(208),
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olapaMcmsy dmuenpalo icone gg,inlsnaiut on rnpeseos to ix.icillnmao

AF 7102: saclisC aesuc fo taalipyc “wngkil”a aennmipou ssuidnii(o ,ntoes a,eahedhc vconuierdtopn guco,h tacphy ro fsdufei tetinsiliart n.)eflrtaiti ry-aX slkoo orswe htan iatepnt. High teitr of lcod niustnailgg g,M)(I hchwi can igltatgeanu or ysel RC.sB ornGw no oEnat .atrtrema:Tange lsedam,cori iconx,yedlcy ro eunlonrouofoqli leilin(pcni vtiffeience ncies Msypaocmla eahv on clel a.B Al)wCl = rafiA,c esnnBld,si rocihnC noii.entfc –DK = eytrnveihg Na.esnletolae deissea nca be arecqudi dingur spseaag ghtoruh cenidfet bihtr anl.a cNo lelc aw.ll toN nese no Grma iant.s ePphoicolrm tcleBAraa. i abemrmen ionnscat soeslrt ofr is.ailyttb lyMlaospcam puninaemo is oemr oocnmm nntisit aep ;&tl 30 raesy Fue.oteql nrd rbokuaset ni rilitmay tcseruir drsnmiaopsl op nac.aMsy gtes ocdl ituowth a tcoa lecl( l)a.wl

johnthurtjr  Have you mixed Chlamydia in with Mycoplasma? +2  
smc213  I mean the Q stem is not about Chlamydiae, but Chlamydiae does lack the classic PTG cell wall d/t decreased muramic acid = beta-lactam abx ineffective. FA 2018 p.148 +