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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 oyu okol ta olrwdU eosuiqtn DI 22991 it sah a uwofndelr eapxoitanln for thsi. If yeth share teh seam optepies, it lwli aevh a rwdonawd espoIf. l yhet serah neno fo the emas tisop,pee the ilen wlli eb ozahitornl rcosas het garhp idi(ncagtin no cahneg as hte anmout of Y eddda esre)icnas

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eacv  gom ESY!! takhsn roUdwl I got it te!crocr xecatly itsh qx keasd het ceatx tsipopeo gni!ht aaHahh I oldve it !! +9
pg32  nevE tfera iegdanr teh drWolU anolnax,tipe I ma istll ont esru owh teh anwrse ahtt sed,ar itP"nroe Y eepxssesr lal of teh epiestpo esseedxrp by peroint X, tub itonrpe X soed ..on"t. is occnietr.r Beasd no hte ah,pgr I 'dnot ees a wya ew nca luer otu htta wnsare hecico nad it nodsus remo liylke ahnt othb X nad Y ngivah teh EACXT EMAS opespi.te anC yneona ipa?elnx thaW luwdo hte pgrha loko keli if het teuqdo nsaewr ehocic asw e?rtocrc +3
69_nbme_420  fI ouy kmae up an lexepam wtih esmun,rb ti alryel ph!sel ntrPo“ie Y xesserpes all fo the iteopspe rdsesexpe yb ,X tub roetinp X osed not rxepses lla of ppsteieo spdsxeere by onrPite ”I.fY ew ysa nrpitoe Y sah iepetops ,1 ,2 dna .3 Tneh irneoPt X ahs sitoppee 1 nad 3. enTh ew nca clryela ees het olharnitsipe het UOTNMA fo Y addde evitaerl to X odbnu olduw TON eb ran.lei Stated hroatne awy – we deen an inolxtenypela meor atuonm of Y to CYPMLETEOL ndibun X adn rhtoreefe ereht douwl ton be a noe to oen niepcidto ni eth harpr miilgSa ogcli lipespa orf eth rnwaes ohiecc atth staste tn"roeip X exssepser lla fo teh esepitpo edsexpres yb ternoip Y, ubt otnrpie Y eods ton epexssr all fo het tspieoep pesxereds yb toneirp X.g .E. If rntopie Y sah itepseop 1 adn 2. Adn ptieron X sha ietppeos ,1 2, and .3 erHe agni,a ew ahve dtsfiiaes eht naresw cehosci i,nodcotni nad no tmrtea who uchm ew ircnasee onirpte ,Y poretin X lilw slitl evah eoeippt 3 nubod in hits e.asc +5
69_nbme_420  utJs ot lryafic orf the frtis a:rcesoni We aveh 3 istepope no Y, dan 2 eepotspi no X. Thta m,neas sunsmiag the pspioeet rea lal treespn in leuqa amutnos, if I dad 030 rmgas fo ritopen Y to the sonultoi - noyl 020 gsamr lwil bdni iopnret X. DNA YOLN 200 smarg fo nrptoei X nca be ubn.dnou peHo the ubrmnes !pelh +1
fruitkebabs  For oybnyad lslit tskcu on iPeotn"r Y essrespxe all of teh eepospti sreepdexs yb irtnpoe ,X utb rpnoeti X odse ,"nto lthhgoua hsti netestmta mya eb u,rte heret is nto ueoghn rnootiianmf in eht iutqsneo ot vpore hs.ti eW nkwo rof tcfa ttha ceebuas the onmAtu fo bdlelea X undob ahsecer ,0 ta the yrev aslt,e petrion X dna Y peerxss the maes peisepot ensci at a tiencar tnooitan,eccnr Y is elba to pyocllmtee ipedslca lal X fmro hte etsy.ms hsiT t'oends exedluc the slstiyiibop hatt three may be extar eseoptpi no ,Y utb it 'etsdno voepr it .rethei +4



 +2  upvote downvote
submitted by amarousis(27)
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so hwo uoldw het hrpga kolo rfo tpieorn x ersepxses all of the pispotee redseexsp yb poeintr y, btu nptoire y oeds not rspsexe lal of het psietpeo peessxdre by rpnieot x?

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drw  nhet omse t-Xina ncaotn eaocrtle ot Y even Y is ddeda at thereawv hhgi soe.d at siht oiitd,cnno eth lnei cna enver thcou eth a-.iYsx no hte nr,crayto if Y sserexp lla iesptope no hte X, btu X sdeo ont pseserx lal poetspie no eht Y, ahtt msaen osme Y oetepspi aer not sene on .X at hsit cii,ondtno I dn'to wkno awht lliw eb eth ilen keoold l.kei +1
medbound57  I tnihk hatt eht nise'l nwdrwoda lpsoe odwlu eb eestrpe, nisce Y sah mero ssiet atth eht nyoiabtd dluwo ndib o.t +

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



 +1  upvote downvote
submitted by usmleboy(19)
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nA abidtony nac onyl nigoezrce a silgen pe.ioetp nScie ew ese teh eomr Y dedda sdela ot sles X u,dbon tehn oyu cna nraose they rshae teh smae iidbngn i,tess nad Y is inogprervwoe .X

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srmtn  MGO itsh si the eranos !hyw tnhka y!!o!u +
srmtn  utb ehter rae aitensoibd taht nca ctitraen ithw 01 l.amp.pxeoi.seeetp M.gI.. orrys otg ltos nagia (: +
chj7  rFo naenyo lilst enildgwl on ,ihts the rcspseo ehty tlka abtou ni eth squentio tmse si osipylsb coylplanol t(shu het susei of lulempti o.etiep)sp +



 +1  upvote downvote
submitted by rhizopusmucor(1)
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I uofdn hi,ts I nkthi ti igvse nakdi fo na tlpxnaoanei: If the nrrioseesg fo ogl A')(/(A 1)- no glo- B is nalrie htiw a espol of ,1- htne thsi ciatisedn taht hte tnaomngsai si oeiivcttpme and yb tiinodefin hte gaiotsn nda oinaattnsg cta at hte EAMS rcnogioetni estis. oS asbcliyla eth rmoe you add Y, eht lses X is noubd, cihhw esnam htye hvae a smae ltsrrctuua cmetnpoon peptei)o( adn tmus act no the emas ?stie D'ton wkno if tihs seamk .es.n.es

poehi.e.bdglbc///trh~thaldtmdtepnh1jns/sagb/suifp:uc/ysu.iatmcso

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 +0  upvote downvote
submitted by stepwarrior(29)
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htis uiostqen was ettru S,B but het wya I iteifjsdu aes"m e"iptseop saw htat ti adsi ni" hte otctenx of -aisuernmt ,X" e,.i. hhwic eotepisp wulod aehv eenb evepdoedl in the tcenxto fo eth sotbdaneii rts.eepn It's kiulylen tath itan-X iaosidnebt dlwou nbid ot psioptee on Y ttah r'tnea no .X But you dlocu ergua trhee are eohcrietlta ppoeeist no Y atht cdulo be dobun by hoteanr oydntabi ahtt do'snet esixt ni tshi .ascnrieo

Veyr andwr otu nda otok me 5 isemutn to lauytcal uigref uto on hte es,tt seohltyn a weast of iemt ni my nnpi,oio tub trehe uoy go.

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 +0  upvote downvote
submitted by peachespeaches(2)
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cueaesB it si a tgaisthr owwnradd ,eplso uoy nac also ellt ttah Y dan X are onubd ni ilmsrai syaw yb oes.nibaidt tahW tfisetaerndfei teh ,otw eth,n 'nits peotpei gdnnibi t,ialypibca btu het ntnonicacet.or llA esel ulqea twih ngbinid sts,ie oemr Y iwth an nncnhuiagg taunom fo X ilwl alde to sesl X ud,bno in a 11: an.mrne

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 +0  upvote downvote
submitted by ilikecheese(46)
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hgiH X is dnbou wnhe wol Y is de,dad dan owl X si dbuno wehn Y si Sdd.daoe MAYBE hety era motcpengi ofr het emsa dgnbnii sptepteooi/p edu to tish leoinhsiartp e(=oeippt dtyiobna bnigdni ?)??s? e????ti??

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 +0  upvote downvote
submitted by breis(56)
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uoyr gseus si sa gdoo as ..........................i.....n.....................e................m.

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nala_ula  I epsnt so logn no tsih quseiton and es.a..m haaahh +



 +0  upvote downvote
submitted by am.cassandre(0)
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aRn osrsac a niesoqut ialsmir ot this in ratoehn etqnosui ban.k In taht q,oinesut heetr saw no anghec as hte notanetroncic of hte wne openrti aws ed,add whcih neamt ttha the wot rsnpeiot ddi not hraes liasimr eot.psipe In htis quso,ntie eht doibytna is just ytrgni ot dbin tis ,oeieppt os adingd eomr or y namse sesl idgibnn of oiternp x aeebscu het adtyniob fosavr teh rpentsoi the e.sma

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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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