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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 ouy ookl ta worUld quntoies ID 29291 it ash a fleudonrw tiaxonelpan rfo st.hi I f htey rhsea eht emas oe,spptie it will eahv a wdawodnr pls.I eof heyt raehs noen of het emsa p,seitpoe teh ilne illw eb atzhoniorl osacrs teh ahgpr ndtigcina(i on agecnh sa eht tnmuoa of Y edadd sen)arceis

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eacv  ogm !SEY! thsank ordwlU I got ti t!rceocr etycaxl siht xq deaks teh axtec teooispp htign! ahahHa I vodel ti !! +9
pg32  Eenv ferta rdeangi eth loUWrd axpliaoe,tnn I am tslli otn esur ohw eht erwnas tath ,esdar Pnter"oi Y ssxpreese lla fo teh ipsoepte dxrpseees yb tponier X, tub nreipto X eods t..".no is ent.rrocic daeBs no hte pg,rha I nd'to ees a ywa we anc elru uot atth warsne eocich and it ndosus remo leykil nhta thob X nda Y nighav het CEXAT AMES teeoips.p anC ynnaoe anpile?x Waht dwulo eht grpha olko lkie fi eth duoqet nasrwe hecoci saw ?rcroect +3
69_nbme_420  If uyo make up an eelxapm htiw ,esbrnmu it reayll h!slpe Poen“tir Y sxsrepees lal of hte teepsipo spexsdeer yb ,X ubt rnpotei X edso otn rsepesx lal of esopeitp edpsseerx yb inPetro IYf .” we sya tpernoi Y sah spptieoe 1, 2, nad 3. henT ntirPeo X hsa ppeeoits 1 dan .3 Tenh ew nca arllcey ese the otlahirsipen hte MAUNTO fo Y dedda ilatvere ot X bound owuld TON be eli.arn Sttead tnaroeh awy – ew ened na tenynxoelapli roem uoamnt of Y ot YPCTOEELLM udbnni X adn rhftreeeo reeth uwlod ont be a oen ot neo ipidtocen ni het gSamah rliipr icgol epspail rfo hte anwser icecoh htat tsteas "ntroepi X pexsesrse lal of teh etsopepi reseesdxp yb ioptern ,Y ubt pnteior Y does tno prsxese all fo het sioeptpe xdsesepre yb epitnro ... XEg If rtnpoei Y sah stepioep 1 and 2. dnA notrepi X has iptoepes 1, 2, dan .3 erHe ,aniag ew aehv edifitssa the nwaser eisccho o,inonitdc dan on mtetra ohw chmu we carniese repinot Y, rptinoe X wlil itlls vaeh ppoeeti 3 uondb in iths ace.s +5
69_nbme_420  tusJ to rfalyic orf eth itfsr ric:noesa We heva 3 ptipeeso no ,Y dan 2 poetsepi no X. aTth sn,ema uangsims het espeopit aer all pneters ni laqeu ontua,sm if I dad 030 agmsr of iteornp Y ot het otulinso - lnyo 020 srgma will dnib tierpno .X ADN LYON 020 sargm of tnpreoi X acn be d.ubnonu Hope eht mrbesnu lhep! +1
fruitkebabs  oFr yydonba tslli tkusc no nit"rPoe Y sespxrsee lal of eth tsieoppe eexpesdrs by oerptin ,X tub nrtpieo X deos no"t, hugohtla htsi ttnteasme aym eb teu,r rehet si not guhnoe nnaotomrifi ni het onisuteq ot prove ihs.t eW wonk for caft htta cuabees eth unotmA fo aeelldb X obdun heraesc 0, ta the veyr e,lats eriotpn X and Y spsexre het asme eeoitspp necis ta a renctia oecnrnic,onatt Y is laeb ot epymlclteo splecadi lla X morf eht est.msy Tshi nsdeto' xeecudl the ipibsiltosy hatt etehr aym be atrex isepteop on Y, tbu ti dnto'se orpve it iee.thr +4


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submitted by amarousis(27)
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os owh uwdlo eth hragp olok ofr opntrei x sepeexrss all of teh pstopeei pesesxrde yb itponre y, tbu ertpnoi y odes otn pexsrse all of het etoespip eeedssrxp by tpnrieo x?

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drw  nhet oesm atiX-n ancotn octalree to Y evne Y si dadde ta arhewevt ihgh do.es at tshi oodinnitc, the enli nac veenr ouhtc teh si-.xYa no eht tna,oyrcr if Y xseserp lal ppotesie no the ,X btu X odse otn spesxre lla ppeteois on teh Y, htta smnae seom Y ppetsieo rae nto seen on .X at isht dntoicio,n I nd'to nkow htwa liwl be teh neli oleodk li.ke +1
medbound57  I ktihn that het lns'ei nwraodwd spelo duwol be ,rpetese esicn Y sah orem tsise htta eth ybdtinao wdlou dnbi to. +

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


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submitted by usmleboy(19)
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nA ytdanboi nca oyln noergczei a selign .itepepo ciSne we ees the omre Y added dslae to ssel X ,unobd enth uyo cna anrseo yhet rhsae het asme gndibin ssiet, nad Y si pwoviogenrer X.

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srmtn  OGM sith si eth eanors !yhw kntha !oyu!! +
srmtn  tub ereht are snibiaoetd ahtt nac aitcnter wthi 10 i.elpeaesmpeopx.t. MgI... sorry otg solt igaan (: +
chj7  orF naoyen llsti gldwniel on t,shi teh eropscs tehy ltak oatub ni hte esqtinou smte is silsyopb olyolpnacl u(hst the eusis fo tumilelp ie)o.pestp +


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submitted by rhizopusmucor(1)
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I ufnod hst,i I nikth it vsegi akidn fo na ainn:ptoxlea If hte eosregrsni fo log (/'A()A 1)- on ol-g B is elianr itwh a selpo of -1, tneh tsih ianetsidc taht het stiagnonam is ivompeitcet nad yb edtfinioni eth otinsga dan noastginat cta ta eht AEMS ennioortgic tsies. So llacsyaib the oerm uyo add Y, the sles X is d,ounb hhwci amsen tehy ehva a ames scruatlrut cpnoeotmn (poti)eep dan sumt cat no eth esma s?tei oDt'n kwno if this saemk n.ssee..

bupt/.nan.om/ddce~ut:simrjhs.t/ds/iegsefbt/pblocp1ahtlhuh/acsyig

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submitted by stepwarrior(29)
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tsih tqesoiun asw uertt SB, ubt hte wya I ijdeifstu "easm poeeistp" swa atth it aids "in teh neoxtct of -rsiemunat X", .,.ei hwcih esppoite owdul veah enbe eevdoepdl ni het txtneoc fo eht stbinadioe snpeert. It's ineylulk hatt n-aitX iidnbeotas uolwd ibdn ot oetpipes no Y ahtt naet'r no X. But uoy oudlc aegru heret rae ttlcieoerah pesoptei no Y ttah udlco be obdnu yb ranetoh bonytaid htat toneds' seitx ni this cn.esrioa

yVre dwran tou and toko em 5 smuinet ot ltcyaaul eiugrf out on teh stet, lnoyhste a wsate fo imet ni my ,niipono tub reteh yuo o.g

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submitted by peachespeaches(2)
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eucesaB ti si a artigths wonddwar ope,ls uoy can losa etll taht Y adn X are unbdo in sialmir wsay yb ioasdbi.ten atWh fendeisaiterft hte wo,t ,then inst' eietpop igibnnd iy,cailpatb tub hte iten.oannrtcco All eesl uleaq ihwt ingbidn esit,s roem Y htiw an nnngachuig uatnom fo X lwil lade to lsse X bod,un in a 11: .emnran

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submitted by ilikecheese(46)
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Hihg X si dnuob nwhe owl Y si ded,ad adn olw X si nbdou nhew Y si .odSe dad YEBMA teyh are mepogtinc rfo the asme bgnnidi poe/epoittps deu to siht spnelrhtiaio ope=pi(te ayotdbni ibnndig ??e???s ???t)i??

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submitted by breis(56)
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yruo sseug si sa oodg sa ............e....n....................................i............m.....

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nala_ula  I tepns so gnol on stih ieotnqsu and a..me.s aahhah +


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submitted by am.cassandre(0)
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nRa rcossa a estioqun irmisla ot tshi in eahtnor oeuinsqt knab. nI taht oneq,uits teerh was no necagh sa eht otnnraiotcnec fo hte wne pnoreit saw ,daedd wihhc eantm taht het otw eoriptsn ddi ton hesar larmiis .eptsipoe In htsi qtsen,uio the aodbnity is tjus tiyrng to dbin sit ite,oepp so dgnaid omer or y nasem essl ingbdin of rptieon x aubsece eht nytdbaio avosfr het iosrtpen hte aems.

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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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