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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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If yuo oklo ta lroUdw qeotisun ID 22199 ti has a rduoewfnl nnoepliaatx orf .tshi f I heyt erhsa eht seam ,tpospeei it liwl avhe a wanrdwod elpfIo s. etyh erash neon fo het aems etoipes,p teh ilne lwil eb oatlrzohin sscaro teh rhpga ncg(tndaiii on genhac as eht tmaoun fo Y eddda esae)riscn

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eacv  gmo EY!!S hktans dloUrw I otg ti e!trrcco xltayce tish qx kesad hte cxtea itoopspe hi!gnt hahHaa I lvedo it !! +9
pg32  evEn efrta angdrei teh UldroW xilta,enoanp I ma lslit ont usre woh hte esrwna ttah desa,r oPie"trn Y seesepxsr lal of the tppseieo desxsrepe yb noeirtp X, ubt eiprtno X dose .no.".t si cencriot.r sBeda no the arg,ph I 'notd see a ywa ew cna rule tuo atht sernaw icceoh adn it nossud erom yleikl ntha thbo X adn Y hgnvai teh AXCTE ESAM itseppeo. naC oeanny nxpe?ali thWa wlodu the ghpar ookl eikl fi hte dquoet nreswa checoi saw etrcorc? +3
69_nbme_420  fI ouy amke pu an paexlem whti bs,muenr it relyal spelh! r“iePnto Y espsexres lal of hte ppsoieet spxedrsee by X, ubt nirpote X dseo ton xserspe all fo etpeipos eepsexsrd yb reotiPn If” .Y we say pineotr Y ash eespptoi ,1 ,2 nad 3. Thne inoetPr X sah ppstoeei 1 nad 3. Tneh ew acn rallyec ees het hoilistnprae the TONMUA of Y daedd lietaerv to X bnoud ulwod OTN be enlia.r eattSd otheran wya – we dene na oaenltyniplex moer umtoan fo Y to OELYPEMLTC nbunid X and eeehorrtf ethre lodwu otn be a one to oen cpidentio in eht giralSm iahrp locgi ispapel rfo eth aenrws eoichc atth setsta "tipoenr X esesseprx lla fo teh oieetpps exerpdess yb iprtone ,Y utb otnepri Y oeds otn srpxees all fo het ietpsope spxedeers by ortenip g X.E.. If opniert Y has pepisteo 1 dan 2. And eitnrpo X ahs ptpeeois ,1 2, adn 3. reHe agani, we avhe idteissfa teh nawesr eihccso iotnod,inc adn no emtart owh uhcm ew nciseaer oierntp ,Y opiretn X lilw sltil ehva ipeptoe 3 bonud ni iths ec.sa +5
69_nbme_420  tsuJ to iylrfac for eht stfir niosrc:ae eW ehva 3 tseoiepp on Y, dan 2 sieptpeo no .X tTha senma, iasgmnus het teeppiso aer all srteenp in qluae namtuso, if I dad 030 samrg fo potiner Y to teh intouslo - oynl 020 gamsr lilw bnid ipnerot X. ADN NOYL 020 mrsga of eonritp X cna eb duu.bnon Hope het nbuemrs phl!e +1
fruitkebabs  oFr oynbyad iltsl cutsk on ot"enPri Y pssrxeese all fo eth etpiopes srdeepsxe yb oinrpet ,X tbu rtipneo X sode n,"ot uthglaoh thsi tasnemett aym be ruet, htree is nto oguehn noimnfotrai ni het unetosiq to ropev sih.t We nkwo fro tcfa hatt baesceu hte utAmno of ldelabe X bduon haseerc ,0 at hte evry a,tsle topreni X nda Y eerpsxs het aems piospeet eisnc ta a erctain etcnanoo,ntrci Y si aelb to cmpeoltely sicdplae lal X orfm hte emy.tss sihT e'odnst eedxclu eth lsyiibstopi taht theer may eb xtera eosieppt on ,Y tbu it 'ostedn orvep it tehir.e +4


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 +2  upvote downvote
submitted by ∗amarousis(27)
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os how lwdou the hpagr okol rof tieornp x peerxsess all fo hte eeopspti sdeeeprxs yb tnoerip y, tub otepinr y osed ton seersxp all fo teh peeipost eersepxsd yb prineto ?x

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drw  ehnt emos t-Xain ctoann lecerota ot Y veen Y si dddae ta weehtvra hgih eds.o ta tihs dnnii,coot eth lnie can nvree ohtcu teh xYias-. on teh roacrnyt, if Y xseespr lla itppeseo on het ,X tub X edos not srpesxe lla eeotsipp on eth Y, ahtt nasem msoe Y peosptei ear nto enes on X. ta isth ncdi,tonoi I t'nod kwno hwat ilwl be the enli oelkdo ekil. +1
medbound57  I inhkt hatt the snie'l dwwadnro oplse lduow be esretpe, icsne Y has mero stsie tath het bodtyain uldow bind t.o +

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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nA toidnyab anc ynol enocrgzei a nlsegi ippeoet. cneSi we see hte eomr Y dddea lsdea to ssel X uo,dbn hnet yuo anc aesnro eyth aerhs hte saem igndnbi e,stis nad Y is vnrpregoeiow .X

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srmtn  OGM this is teh ersnoa h!wy ktahn !!oyu! +
srmtn  btu ehtre rae iainsebodt tath acn eitcanrt hwti 10 p.piaxleeeo.mse.tp .IM..g rsoyr otg tslo ganai :( +
chj7  oFr eanyon llsti gldewiln no tihs, teh pcsrose ythe atkl aobtu ni eht oeqinuts tesm is plysiosb nloaplcyol (htus eth sesui fo imptelul p.eet)opis +


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 +1  upvote downvote
submitted by rhizopusmucor(1)
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I fodun ,siht I iknth it esgvi ndaki of na oi:nxtlneapa fI eth snsrreeogi fo lgo A(/)A(' -1) on -olg B is realin wiht a eopsl of 1,- htne isth iteincasd atht hte nmnogaatis is eviitpmotec and yb oifnteiind het isnoatg adn gnsiantota atc at hte ESAM cnortiioneg siset. oS lalbiaysc hte mroe oyu dad Y, het elss X is oub,nd hchwi nseam eyht evah a aesm ctsarlturu onctonmpe pp)oi(eet dan tmus tca on het meas si?et tnDo' wkno fi htsi smaek ..sesne.

aicehb:potgh//f.isnbltsuhmuh//sjscsnat.u/pr.boldim1~dtcad/tgpeye

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 +0  upvote downvote
submitted by ∗stepwarrior(29)
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shti iteunsqo asw truet BS, tub hte yaw I etiuisdfj e"asm ie"stppoe saw atth ti dsia "in eht exnttoc of eru-tsamin "X, e..,i cwhhi tseeoipp udolw heav ebne doeevelpd ni het ttxnceo of teh idosetiabn nspee.rt tIs' yekulnli that inaX-t oisebniatd owldu dbin ot soptpiee no Y ttha 'rnate on .X tBu uoy cuold uegra tehre era iaoerhltcet eosppeit no Y ttha ulodc be dubno yb nahoret yodiabtn htta oednts' xseit ni shit .ricnaeos

Vyre dawnr uto and okot em 5 esutnim ot ytuaclla irgfue uot no teh ,etts lthonsey a twaes of itme in my ,ininopo but eehrt you og.

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 +0  upvote downvote
submitted by ∗peachespeaches(2)
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eueasBc ti si a ahrtitsg wnawdrod pe,los uyo nac asol llte atht Y and X are oudbn in arliism aswy by tienods.bia Wtha eindieftefstar teh w,ot nhe,t ts'ni iptepeo ninidgb aatliycpi,b ubt het anictcrn.eonot llA else auleq ihtw nibding tss,ie omer Y thiw na acghignnun tmaonu fo X lilw alde ot esls X ndub,o ni a 1:1 nnrea.m

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submitted by ∗ilikecheese(46)
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higH X si noudb nhwe low Y is ddade, adn olw X si obudn nweh Y is a.d Soedd MYAEB htey rea nmiecogpt ofr teh mesa dbngini stopi/ppteeo edu to stih ipotlnhiaers pt(e=eoip byondtai nnbgdii ???s????ei???)t

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submitted by ∗breis(56)
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royu sesgu is as ogdo sa .......................................m.........e.............i....n....

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nala_ula  I pntse os onlg on hsti iqsueton nda ...smae ahhaah +


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submitted by am.cassandre(0)
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Ran ssocar a oiuntesq sirlmia ot hits ni etanrho siuentqo akb.n nI ttah ut,esqion theer asw no agnche sa hte cotecaninotrn of het wne oenrtpi saw dd,aed ihhwc antem ttha hte wto ornsptie idd not rheas saiimlr iesepp.to nI tsih tq,niseuo het inoadybt si ustj tgyinr ot bind its poeepti, os dagind rome ro y smean sesl gidbnni of poietnr x eabesuc the btyaiond aosfrv eht pienrost the es.ma

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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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