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Retired NBME 20 Answers

nbme20/Block 2/Question#41 (reveal difficulty score)
Purified serum antibodies elicited by ...
Proteins X and Y express the same epitopes 🔍 / 📺 / 🌳 / 📖
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 +11  upvote downvote
submitted by ∗usmile1(154)
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fI yuo ookl at Urodwl nuesoiqt DI 29129 it has a rfewonuld xitaoelpnan for i.ths f I thye rsaeh hte mase pios,teep ti liwl veha a rdnawwdo spIleo. f they ersha nnoe of eht ames psteeoip, teh neli llwi eb nozaohlrit asscor het pgrha antdii(cing no chnage as eth omnuta fo Y dedda eeasr)ncsi

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eacv  mog S!E!Y snkath rodlwU I gto ti rercoct! lateyxc itsh xq aekds the texca oeopstpi !igthn Hahaah I edvol ti !! +9
pg32  vnEe freta dagienr eht WUodlr en,altxioanp I ma lilts tno rseu woh teh eawnrs taht dar,se "toePirn Y xrsssepee lla fo eth tieppeso xepsrsede yb pernoti X, btu penoirt X seod t."o.n. si octnrei.rc saBed no hte har,gp I t'ndo see a ywa ew nac urel out atht rewsna hccoie adn it snsoud rmoe iellky athn obth X dna Y gvhain eth TACXE AEMS sep.etpio aCn nenayo l?penaxi ahWt owudl the apghr loko keli if the edtoqu aerswn cecioh wsa rtecr?co +3
69_nbme_420  fI oyu meka pu na melaepx whti rbne,sum ti rllaey pshl!e onei“rtP Y pereessxs lla of the teopipes pxesrdsee by ,X tbu poiertn X sode nto pxssree lla fo sepitoep exressdpe by oetPinr ”. fYI we sya ntrpoei Y ash epspioet ,1 2, and .3 enTh troePni X ash speitpeo 1 nda .3 Tneh ew nca eycallr see eth iisarhtenlpo teh UAONMT fo Y added tailerve to X bdoun dwulo NTO be .irneal etSatd haorent yaw – we edne an lexteiplayonn reom tnmuao fo Y ot CLOPTLYMEE bnduni X nda oeeterhrf erhte lduwo nto be a eno ot eno enopiidtc in eth haSm rprligai icgol alpsiep fro eth nawrse ohccie ttah setats pnt"ioer X seeseprxs lla of the ppieoest pdeesersx yb eniprto Y, but pretoni Y esod nto xrseesp lla fo eht eteoppis redexspes yb rtopine g.X E.. fI preoint Y sha espoeipt 1 nad .2 dnA oritpne X hsa ippsetoe ,1 ,2 adn .3 eHre a,iang ew heva atessdifi hte esanwr cicoseh ,ntodoinci dan no eamrtt owh hucm we ereainsc tenriop ,Y eirtopn X wlil itlls veah eiptpeo 3 nudob in iths sce.a +5
69_nbme_420  tusJ to irafycl orf hte fsrti nciseo:ar eW aveh 3 epoeispt no Y, dan 2 epipesot no X. atTh sman,e agsinsum eth ppoeeits ear all persnte ni uqlea aosumn,t if I dda 003 amgsr fo tpniroe Y ot hte sotniuol - ynol 002 rgmas lliw indb ipntero .X ADN LYNO 200 sgamr fo etiropn X nac be uou.nnbd epHo teh rmesnub p!leh +1
fruitkebabs  rFo oanydby ltsli tcksu no teinroP" Y ressxepes lal fo het eipstope spesxedre by otenrpi X, btu oientrp X edso ",tno toahlhgu itsh taetments yam eb t,reu eehrt si otn ugehon faotriimnno in eth intusoqe to ovepr thi.s We kwon rof ftac that eabuesc eht Anmotu of lelbade X nbuod chsraee 0, ta eth vrey ta,esl ntroepi X nad Y xpersse the smae piotspee eincs at a triecna toccnranintoe, Y si leab ot clopymetel ipclades lal X mfor the s.setmy iThs t'endos elcuedx hte stboilyispi atth erthe mya eb taexr tseiopep on Y, tbu it dnte'so vrepo it iehetr. +4


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 +2  upvote downvote
submitted by ∗amarousis(27)
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os ohw uwlod het hgrpa look rfo pneitor x esxsrespe lal fo hte eepptios sdpxerese by poietrn y, utb oepitnr y dsoe otn sresepx all fo het tseopepi pesxsrdee yb rpioetn x?

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drw  thne soem iXnat- natcon rcloeaet to Y neev Y si ddead ta evthrewa hghi osde. at sthi ct,oindino hte lnei anc evnre otchu hte a.ix-sY o n teh rctonay,r fi Y xesrpes lal otpeeisp on het ,X but X edso ont exepssr all peitoesp on eth ,Y htat msaen seom Y spopeeti aer ton eesn on .X ta hsit notocd,nii I tod'n nowk athw lilw be het nlie kleodo ik.el +1
medbound57  I htnki ttha eht nisel' dwoadrnw slpoe udlwo eb eestre,p icnse Y hsa oemr sesti hatt teh bdaitnoy oldwu dibn .to +

why this is wrong- prtoein y has all epitopes of x and protein x does not have some epitope

+1/- prudvi96(0)

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 +1  upvote downvote
submitted by ∗usmleboy(19)
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An yiatndob nac yonl cezrginoe a glnise poe.eitp Senci ew ese hte eorm Y dedad alesd to less X odu,bn ethn oyu nac rnoase ehty esrah the eams ibgnind i,esst adn Y is vnowerreipog .X

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srmtn  OGM ihts is the norsae wy!h khtna u!!!yo +
srmtn  btu eetrh rea indbetsiao htat acn tnitecra htiw 10 msxt.elee.eapp.opi IM..g. sroyr ogt lsto ianga (: +
chj7  oFr aonney iltsl lignledw no tih,s the crpeoss eyth tlka aotub ni eht iqonuset smte si slbsopiy polynoallc ht(su eth ssuie fo uitpelml peesio).pt +


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 +1  upvote downvote
submitted by rhizopusmucor(1)
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I nfudo siht, I ntikh it gvsei niadk fo na oninalexpta: fI eth osererigsn fo glo /)A('(A )1- no g-lo B si lrniae htiw a slepo fo ,-1 ehnt isth tcndiisae ahtt eth stoiamngna is optmeteiciv nda yb oifninetdi eth nitgsoa adn astotngani cta ta the SEMA ennrctogiio ssite. oS lsalbcyai the mreo you dda Y, eht lsse X is un,dob wichh masne yhte ahve a esma rcsaltuurt ntonmceop oetip(pe) and stum atc on hte seam et?si tn'Do know fi ihts asmek .e..esns

nthpsuasolug.bhnjt.ih/t.aaccdeb//eu:geh/msp/smod/yfbi1~pldcisrtt

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 +0  upvote downvote
submitted by ∗stepwarrior(29)
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siht qinestou was erttu SB, btu the ywa I edijtfisu "maes ppi"osete aws tath ti adis in" eht cttxeon fo tea-msunri X", e,i.. hwihc osipetpe wloud hvae been ovdepldee in the txeotnc fo the asibodinet ntersp.e Ist' kyliulne ttha aXtn-i atindobsie lwdou bind ot ipoesept no Y ttah era'nt no X. tuB uyo ulcdo gaeru etrhe ear otiaeethlcr seoeiptp on Y tath dluoc eb nboud by nathroe abiotdny hatt sdn'toe eitxs ni siht sa.renico

Veyr drwna otu dna toko me 5 stmiuen to ulytalac irefug otu on teh ,stte ytslenho a wtaes of mtei in ym ,noiinpo ubt ehtre oyu o.g

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 +0  upvote downvote
submitted by ∗peachespeaches(2)
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usBcaee it si a gasthrit darwnodw lepso, uoy acn aosl llte ttha Y dan X rae nobud in amrilsi awsy by itsn.doeiba ahtW fesraitntdfeei eth wt,o nteh, is'tn teppoei dbignin icpiatblay, tub het .tccntoieronan All esle elqau wtih nbidign seist, orem Y ihwt na gancungnih ntmauo fo X wlli lade to elss X bn,dou in a 1:1 .rnaenm

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submitted by ∗ilikecheese(46)
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Hghi X is nobud hnew olw Y si d,dead and olw X is bdoun ewnh Y is d e.dSado AYBEM hyet aer menotgicp rof eth smae ibgndni eep/ptotsoip ude to itsh inatrielpsoh ep=iopt(e inabdtoy biinndg i???e?s)????t? ?

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submitted by ∗breis(56)
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ouyr sugse is sa dgoo as ..................................enm..............................i.....

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nala_ula  I ntpes os gnol on isth niotuseq nda s.m.e.a aahahh +


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submitted by am.cassandre(0)
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aRn ssorac a inueostq salimir ot isht in htroena sqtunieo nkba. In atht usito,nqe herte was no cnheag sa teh anonnrctcieot fo teh new erinopt aws ,aeddd ihchw etmna taht the owt istronep idd tno esahr lsamrii otpe.ipes In hsit noietuq,s het odbtaiyn is sujt nyitrg to nidb tsi iepe,tpo os didang moer or y sneam sles ingnibd fo roptnei x ebesacu eht otidanyb afrosv the nopsreit het .smae

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This question tests the basis of competitive inhibition. if they express the same epitope, they will bind the same receptors. Adding more X will mean less binding of Y, hence the downward slope.

+5/- latdorsi(4)

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