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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 uoy okol at drlwoU qotueisn ID 21929 ti sha a dluowenrf opteaxnailn rfo .htsi f I htey heasr eht amse ep,psiteo it lliw ehav a wdwrnado eIfso l.p ethy haser neno of the meas tpsoepie, hte elin lwil be ltaozhnoir sarsoc teh hgrpa cnidgin(ait no ancheg as the nmouta fo Y dedad srne)eisac

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eacv  mgo E!S!Y ahntsk dlrowU I got ti reccotr! xayltec tish xq deaks the eacxt iopsoept ghi!tn haaHah I eolvd ti !! +9
pg32  vnEe areft aigrden the odWrUl ot,analpxine I ma lislt not ersu hwo eth anwers htta ae,rds rtPnio"e Y rssspeexe lla of hte pesotipe dxersepse yb nierotp ,X utb rnpeoti X oeds ..".nto is recti.nocr sBade on eht arph,g I 'ntod ees a ayw ew can leur uot that rswaen cichoe dan ti odsuns remo lilyke hnta boht X nad Y vignha teh TAEXC EAMS tepop.sie Cna anoney ni?aexpl ahWt duowl eth rghpa kloo leik fi teh douqte rneasw oihecc swa trco?erc +3
69_nbme_420  If uoy akem pu na meleaxp whit nusmr,eb it rleyal es!lhp “trioPen Y eeesssxpr all fo eth sipoepte dressepex by X, btu rinoetp X edso ton pxsseer lal fo peiostep esdxseepr by nretioP fI. Y” we yas tnpoire Y sah tespeopi 1, ,2 adn 3. hneT ePtoinr X hsa eiopsept 1 nda 3. enhT we nac rylaelc ees eth thioalpsiner the NAMOUT of Y ddeda elvtirea ot X ondbu wulod NTO eb a.lrnie Stdaet ehnrota ayw – we edne na aeenolitnpylx meor amonut fo Y to OMTLLEPEYC ndinub X nad tefrroehe ethre luwod ton eb a eno to one nptiodcie ni teh ai gmrriphSal cligo ilpspae for het ewarsn ccehio ttah aetsst er"otpin X ssrexpees lal of the ospetipe esxeperds yb teoirpn Y, tub erontpi Y eods otn esxreps lla of eht ptpesioe peeexssdr yb enotipr XEg... If pioernt Y has ieopsept 1 and 2. And norpite X ahs sptepoei ,1 2, dna 3. Hree n,agai ew aveh fasdistei teh nawesr coscihe iioncntd,o dan on ttrame how ucmh ew reaiscen rponiet ,Y itproen X lwli llist vhea poiteep 3 nubdo in ihts .sace +5
69_nbme_420  stuJ ot yiarclf fro teh tfisr i:aoscern We ehva 3 ieteopsp on Y, and 2 ppoestei on .X hatT ena,sm umssangi eth seeoppit aer lal pesrnet in elqau ou,anmst fi I dda 300 sagmr fo ptnroei Y to teh nusiolot - onyl 200 msgar liwl dbni netrpio .X ADN NYOL 002 amsrg of ritoepn X anc be uonbn.du pHeo eht erbnusm ple!h +1
fruitkebabs  orF nyodaby llsit scukt no ortPne"i Y esexssepr lal of eth etiepspo sdpeerexs yb oentirp X, tbu opeirnt X eosd t"no, lhoauthg iths tteemtans may be ut,re rethe is nto hneoug inotnifarmo in eht quensoit ot orvep .stih We ownk orf ftac ahtt bseueca het oAtmnu of bldaeel X onbud eercash ,0 at hte evyr ,leats proetni X nda Y epessxr eht asem tpeiepos sicne at a ncirate notccnter,onia Y si abel to emeytclpol edlcsaip lal X rmfo teh smy.set Thsi toensd' ueceldx het toiyslsbpii ttah etreh mya eb arext tpieoeps no Y, tbu it sdeot'n rvpeo it teie.rh +4



 +2  upvote downvote
submitted by amarousis(27)
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os ohw owdlu eth gprah ookl for toirenp x serspsxee all fo het epiteosp eesersxpd by pntioer y, btu riteopn y deso tno resespx all of hte epsiotpe ssdxeerep yb etrpino x?

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drw  hent omse ain-Xt ntanco teearlco ot Y neev Y is aeddd at vrteweha hihg sdeo. at thsi nodonic,ti teh enli nac rnvee uchot teh -Yaxs.i no het yrc,oantr fi Y spxrsee lla pteoepsi no eht ,X ubt X deso ton sxeerps lla tspoiepe on eth Y, tath semna emso Y ietseppo rea ont seen no .X at htsi oodtic,nin I 'ondt wnko wtha illw be het enil ookdle ek.il +1
medbound57  I khtin taht hte s'elin wodwandr posle uodlw eb erteep,s einsc Y sah mero tisse atth eth adyibnto wdolu dinb .ot +

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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An bnaotdyi anc olyn cgznioree a silnge .eptipeo eicSn ew ees eth moer Y addde esdla ot slse X ondbu, htne oyu anc anrsoe yeht asher the saem gnnidbi ,etiss and Y is enepvorigrow X.

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srmtn  OGM ihts si teh nreaos !why hatkn !uy!!o +
srmtn  ubt heret are dbesiaonti ttah nca itnterac hwti 01 os.eeaepppxltmi.e. ..gM.I ysorr gto lots ngaai :( +
chj7  roF nonyae sllti dwinglel no siht, hte csespro eyht lakt boatu ni eth nqeouist tmse is pssbyilo ylalplncoo u(sth eth eisus of meulitlp seetp)o.pi +



 +1  upvote downvote
submitted by rhizopusmucor(1)
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I ondfu it,sh I hktni ti vseig indka of na olian:ptenxa If the negissrero fo gol (A('/A) )-1 no glo- B is nirela ihwt a oslep of -,1 thne shti decsiitan tath teh sanmointag si tmoiepecvti and yb feitindnoi hte saiotgn and ignstanato tca at eht SAME ioennicrtgo tseis. So llabiyasc hte moer you dda Y, teh lses X is dnuob, ciwhh maens eyht heva a emas lrutractsu mceontnop pioee)(tp and tsmu tca on teh emsa tesi? 'Dnto kwon fi ihst askem e.n.ss.e

ntmh/st..ttshfueaa.cpdublp:mu/aiy~bg1scerhstjcl/osddih/nbopg/e/i

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 +0  upvote downvote
submitted by stepwarrior(29)
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sith etosiqnu wsa utter ,BS tbu the yaw I uifdjstei meas" sp"epteoi aws that it asid "in eht tetcnxo fo tmrneai-us X," .e,i. hihwc opeeispt wuldo heva nbee pveldoede in the xettcno of the inidastboe esnrp.et 'tsI kyilnelu htta nXa-it dainsteboi ldowu ibdn ot opepeist on Y taht rnae't on X. uBt oyu culdo gareu tereh are celheattrio ipstpoee on Y htat ocdul be odunb yb aoerhtn byidanot hatt 'donets xiets ni shti r.eascion

yVer wrand otu nda tkoo em 5 smneuit ot ualltyac fuerig tou on teh tset, hostlney a setwa of imte ni ym ,oonnpii tbu rethe yuo g.o

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 +0  upvote downvote
submitted by peachespeaches(2)
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cBeaesu ti is a gsttraih wddarwno lsep,o ouy nca aols tlel htta Y and X are ndbuo in milsari sayw by biens.idaot Wtah raitdnftesifee eth otw, h,ent s'nti eppetoi gdinibn yb,tcapiila utb hte c.nrocnnotieat lAl lese lquea iwht innbdig ,ietss mroe Y htwi na haniggcnnu anotmu of X llwi aeld ot sels X odu,nb in a 1:1 nmen.ar

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 +0  upvote downvote
submitted by ilikecheese(46)
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gihH X si undbo nehw wlo Y is d,daed dna low X is obudn ewnh Y is ed Soad.d MBEAY hyte are tgpmoneci fro eht maes gbinndi oetp/eippsot edu ot shit orsaeitplhni ep=(teoip dnayobti gbinind s?????? ?e?i?t)?

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 +0  upvote downvote
submitted by breis(56)
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yoru ssegu is as doog as ..........i......m........................n...........e..................

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nala_ula  I tsnpe so nlog no hits qesuonit nda s.ame.. haaahh +



 +0  upvote downvote
submitted by am.cassandre(0)
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anR asrocs a niqtoues iisralm ot tsih ni nrehtao nesuiotq bkn.a In thta eu,tnqios eetrh was on cngahe as hte ccontroinenat fo eht nwe inropet was ddead, ciwhh natem hatt eht two pnirsoet idd ton rshae iasrilm tiesepop. nI shti siqueno,t hte bintaydo si jstu gtyrin to ndib tsi p,toepie os dgadin mero or y anesm sesl ingbind of epirtno x ebesuac eht idyotban arfvos het stiopenr eht 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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