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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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submitted by usmile1(154)
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fI you kolo ta wdrolU iqteuosn ID 19229 ti has a urofwlned oaxelpitann rfo sth.i fI heyt eashr het ames ppet,ioes ti lwil aveh a nwddowra esolf.p I yhte resah neno fo teh easm peeipo,st eth ilne llwi be azrontlohi crsosa eth aphgr d(gtniniiac on cgneah as teh tmoanu fo Y ddead e)riscsnae

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eacv  gom E!S!Y khnsta Urldow I got it oretcrc! xcyatel hsti xq eadks teh axect oopitesp n!tghi Hahaah I odlve ti !! +9
pg32  nvEe reaft gredina hte drUloW aaoxnneiptl, I am ltlis ton ures who hte rasnwe hatt s,daer tri"oenP Y prexessse lla fo het ptesipoe eerdxspes yb tperoin X, ubt oetrinp X odse ..t".no si ccitoernr. sedaB no het phr,ga I ot'dn ees a wya we can urel uto that narwes ecchoi nda it usodsn rome eikyll tnha obth X nda Y hingva het ACXET AEMS .eipsetpo aCn oeyann pln?eiax atWh douwl the prgha ookl ielk if hte tquode nrseaw ciheoc saw ?ecrrcto +3
69_nbme_420  fI you emak pu an meaplex wiht rmnebus, it rllaey !spleh Pir“enot Y ssxperees lla of teh pseiepto depxreess yb ,X but onretpi X sode nto xeseprs lal fo oeipptse peesdesrx yb teorPni ”I.fY ew ays reipont Y sha setipope 1, ,2 and 3. Tneh tPeirno X sah petpeosi 1 dna 3. enhT ew nca llcayre see teh eriolnhtpisa eth TUAOMN fo Y addde levitrea to X odunb uodlw TON eb ei.lanr ttSead nerthao ayw – we eend na noetlalpxeyin orme tnomau fo Y to MYECELLPTO biunnd X dna roheretef rthee wudol otn be a oen to eno itncdoepi in the air malgiShpr cogli ppalesi fro hte naserw iheocc atth ttesas ti"peorn X perxssees lla fo het etspeopi drepsexes yb irpteno ,Y btu inoeprt Y dose ont exsspre all of eht eotpieps eeessrdpx by ienoptr E..g. X If teniorp Y sha stepepio 1 nda 2. Adn eniprot X ahs pepeitos ,1 2, dna .3 eeHr agai,n we ahev sitfisaed hte nsrwea scohcie tdnic,nooi nda on ratetm how muhc ew ercasien oeintpr Y, noripet X wlil llits vhae teoppei 3 ndobu in htsi ace.s +5
69_nbme_420  sutJ to lafryic ofr teh isfrt isreacon: We vaeh 3 eopistpe on Y, nda 2 spoeiept no X. ahtT amse,n siuagsmn het speiopet era all rtpsene in ueqla aut,nsom fi I dda 030 ramgs of tonpier Y ot the uliosnto - loyn 002 amrgs wlil indb rtneoip .X DAN OYLN 020 sgarm fo tionrpe X acn eb obdn.uun peHo teh ebmruns phe!l +1
fruitkebabs  Fro odayybn itlsl tucsk no tneriPo" Y xpssseere lla of hte iotppees eepdessrx yb renpoti X, utb ierpton X deso nt,"o oahghtlu hsti sattneemt amy be tru,e trhee si nto ghuoen nofotnimair in eth eiqnsuto ot povre isth. We kwno ofr caft taht seebcau het tuonAm of leealbd X odnbu hsearce ,0 ta het veyr ,lesat toiernp X dan Y xserpes eht esam epspoite isnce at a cnriate ,ioeconcnrtnat Y si leab to llpecoemyt dpsaceil lla X mofr eht sesmt.y Tihs se'ondt udexcle teh slsboiipyit ahtt rheet aym be taxre psopieet on ,Y tbu it seton'd oervp ti rith.ee +4


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submitted by amarousis(27)
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os owh lduwo het phgar kloo fro tpinero x serxepses lla of hte iesepopt derpsesxe yb etnorip ,y tub ernptoi y esdo nto xeerpss all fo teh epipeost rsxeepsed yb ntpieor x?

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drw  hten soem Xni-at naocnt taoreelc to Y eevn Y is edadd at aehtevwr ihgh oed.s at shti ti,dnocnio het nlei nac verne tcuoh eht si-.xaY no the tnayor,cr fi Y speerxs all ppioseet no eht ,X utb X oeds nto peexssr lal opepseit on the Y, atht emasn emos Y tieespop ear ont eens no .X ta stih tiionon,dc I t'odn knwo ahwt liwl eb het elin kdlooe lk.ie +1
medbound57  I nhikt thta eth es'nil wwdarodn esplo uodlw be petree,s eicsn Y sah rmeo seist ttah teh natydibo wduol ibnd t.o +

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


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 +1  upvote downvote
submitted by usmleboy(19)
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An adybiotn nca nloy neegcoriz a neilsg eitppo.e icSne ew ese teh rome Y ddaed aldes to ssle X nuod,b ethn you acn aensor hyet serha eht emsa nibgdin se,its nda Y is rpogrveniwoe .X

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srmtn  MOG this is teh rnseao wh!y tnhka u!!o!y +
srmtn  tub rhete aer inboidesta taht acn tincraet twhi 01 al.ip.poet.mesxepe MI.g.. srroy gto olst aniag :( +
chj7  roF nanoye isltl iwlnedlg on t,ish teh seocpsr hety kalt oautb ni teh qtinseou tesm is bssyopli yconloplla suth( eth suise of umpelilt ee)oipps.t +


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submitted by rhizopusmucor(1)
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I uodnf tih,s I hnitk it ievsg naikd fo na :xtnenaolaip If het rgsrneesio of log /)(A('A -1) no glo- B si lniaer wthi a sopel of ,-1 ethn htis catneisid ttha the osntainmga si ictoimetevp adn by iioifnendt eht gatiosn adn anongtitsa cat at teh SAME ocenitognri itess. oS sialaclby eht mreo uoy add Y, eth lsse X is nudb,o wchhi msnae hyet heav a aems uultrartcs eocnompnt eeiot(pp) adn sumt atc on teh eams es?ti n'tDo onwk fi sith mkeas nsse..e.

a//jpansfs/tltddhn1udg/ybhuspuo/cbgst~.mcteh.:bpisetlmho.icare/i

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submitted by stepwarrior(29)
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sith tuseinoq aws tretu ,BS tub the awy I ditisjefu mas"e p"eieotps aws ttah it aisd "ni het otncxet fo iuenm-arts ,"X e..,i ihhwc esptioep ouwld ehav neeb edeepvodl ni teh ttcoxne fo the oantbieids ent.pesr tsI' kluyilne tath tn-aXi taoebnsdii wulod nibd ot peeptois no Y htta aen'rt on .X utB you doucl uager herte rae lhotaetcrie spiepteo on Y that culdo be ndbuo by tahoern idtaonyb hatt edt'nso steix in thsi ens.raoic

ryeV awdrn otu nad took em 5 stnmieu to ltluycaa ugrfei uot on eth te,ts shteloyn a sawte fo mtei in my ,ipoonin but heret uyo og.

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submitted by peachespeaches(2)
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sueacBe ti is a itshgtra aonddwrw oples, uyo nca laso eltl taht Y dan X aer bduon in lirsaim wyas by .atinoeidsb htWa faenttsdiereif hte ,wot tnh,e in'st etipope dingbni aiabt,clyip ubt eht oocrtcneani.nt All eels uelaq whit ngndibi ,seist moer Y wtih na nainugcnhg nuaotm fo X will aled ot sles X dbuon, in a :11 namnr.e

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submitted by ilikecheese(46)
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Hhgi X is udobn ehnw low Y is ead,dd and low X si dnubo nwhe Y is S .eadodd MBYAE eyht ear miogetpcn fro teh sema ndgibin psioteppteo/ ude to tish htpleoinsiar eeipop=t( ndytioab nibgdin ? ????i)s?????te

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submitted by breis(56)
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uryo ugses si sa dgoo sa .n......................i........e..................................m....

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nala_ula  I nptes so onlg no siht oqinuset and s.me..a hhahaa +


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submitted by am.cassandre(0)
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nRa rascos a tqsenoui aiilrsm ot thsi in aonehrt oeutisqn a.knb In htta qnou,etsi htere asw on change sa teh netccoainrnto fo eht wne pierotn saw eddad, wchih nemta tath eth wto oteisprn did ton asher lamrsii .psoetpie nI tshi ,snoiequt hte niytdabo is sutj ntryig ot dnib sit pte,eiop os naddgi eomr ro y neasm lses ndgibni of eirpnto x ubesace eht otyaibdn safovr eht poitners hte .seam

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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.


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