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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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fI oyu look ta Uwlodr tiqeunos ID 21929 ti ahs a dfrneulow aeotnnilxap ofr i.sht If etyh shear hte maes otespip,e it wlil vahe a dwdwoarn loIs.pef tyeh erhsa eonn fo the smae petsp,eio eth nlei lwil be nizaohtorl scrsao the grhpa (igncdnitai no hecang as teh umaotn of Y ddaed iesrensa)c

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eacv  ogm !!YES kthsna rdUlow I tog it rtr!coce tyleacx sthi qx asekd eht taxce eooippst gh!tin haahaH I leovd it !! +9
pg32  nevE aftre aignder hte WdUolr oantep,aixln I am tlsil not esur woh the awnrse atth d,rsae o"ntPrie Y xrssseeep all of the oiepspte peesesdxr yb rieotnp ,X utb epitnor X eosd .t.on." is ernc.roitc eadsB no eth hga,pr I dn'to ees a ywa we nac uler uot ahtt resnwa occeih dan it onduss reom kyliel athn thbo X adn Y gnvhia eht ATECX MSEA op.tpseei aCn yanneo xe?anilp Waht odluw het hpgar olko iekl if eht uoqedt nswaer hceico wsa t?orcecr +3
69_nbme_420  fI uoy kaem up na pxleame hitw bsru,emn it ellyar lehsp! roenti“P Y rpeeesxss lla of het piseopet xeepesrds by X, but epotinr X edso tno xepsser all of piespeto eepdssxer yb tinPreo ”f .IY we asy intpoer Y ash oieppest ,1 ,2 and 3. hTne oinretP X ahs oiepestp 1 dan .3 nheT ew nca lyracle see het irlsohatipen hte OUNMAT fo Y dedda rveetial ot X uobnd douwl OTN be ae.irnl aetSdt tnoerha wya – we need na xlotenylpeian rmeo uatnmo of Y ot MELYLOECTP bnuidn X and efoetrerh heter olduw ont eb a oen to one pditeonic in eht grmai hlripSa giclo lepaips rfo hte anewrs ciecoh ttah ssteat t"roniep X espxersse lal of teh eetsppoi rxsdeesep yb ntepiro Y, tub nerptio Y edso otn espesxr lal fo teh tspeioep peeesrsdx yb ienrtpo .g.EX. If oternip Y ash eeppisot 1 nda .2 ndA rieopnt X sah epepiots ,1 ,2 dna .3 reHe ian,ga we hvea ssfdateii the nsrewa hscoeic ,nnicoodit and on mattre how umhc ew siceenra pitnoer ,Y neiotrp X wlli listl vhae peoteip 3 unodb in htsi acse. +5
69_nbme_420  Jtus to ciyrfal fro hte istfr naie:orsc eW avhe 3 ptoepesi on Y, dna 2 etppeios no X. tTha maesn, ngimsusa teh epoeptis rae lla senrtpe ni aelqu ,atnuoms if I dad 003 gsrma of ptonrei Y ot het uoliotsn - ylno 200 rsamg lwil bnid ptinreo X. NAD OYNL 200 agsrm of rnitpeo X anc eb udnunbo. oeHp the sremubn !ehpl +1
fruitkebabs  roF yndybao ilstl tcksu no eon"rtiP Y pexresess lal fo het tpieesop epsedrxes yb itenopr X, tbu nrpeoti X odse tn,o" ltahugoh stih etsnmetta yma be e,utr erthe is ton eunohg oniaorntifm in the ioteunsq ot roevp his.t We kown ofr afct ttah cbaeesu eth onAtmu fo labldee X uodnb hcrseea 0, ta eth vrey alse,t ntioerp X nda Y peesxsr eht smae seeppito cenis ta a aeitcnr itcncnnooeatr, Y is elba ot pomtycleel seliacdp lal X ormf hte ymsset. ihsT ed'tosn dclexeu hte iiylitspobs that ehrte amy be traxe itpeespo on ,Y ubt ti oentds' repov it thre.ie +4


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 +2  upvote downvote
submitted by ∗amarousis(27)
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os who duolw eth hprga olko orf neptior x xesespres lal fo eht petipsoe deperessx yb pioentr ,y btu neoiptr y sdeo tno esspxre all fo het piseoept sxesepder by eriontp ?x

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drw  hent msoe -nitaX anctno elcoreta to Y evne Y si ddaed ta weathrve high dose. ta iths c,nioondti het einl acn eevnr htuoc teh sxY-a.i no teh cyto,rran fi Y eexrssp all eeptspio no hte X, btu X osde ton xpreses lla ipostpee on eht Y, htat aesnm mseo Y eitspoep rae ton esne no X. at tihs ndcoit,ino I dn'ot nkwo hawt iwll eb eht enil okedol i.kel +1
medbound57  I tknih ttha teh en'isl narwddow lsope uodlw eb r,seteep csein Y sah more setis atht the ynibatdo luwdo dinb .to +

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 abiotdyn nac nlyo ezginreoc a nelsgi oppeti.e eniSc ew ese het eorm Y ddead aelds ot sesl X do,nub ethn oyu nca ensrao tehy easrh the meas bnigdni i,tsse nad Y si opivrworeeng .X

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srmtn  MGO siht is teh rasneo !ywh ktahn !!yuo! +
srmtn  tub ehret ear tdiabiosne htat cna racitnte hwit 10 e.oeeptx.ailmpp.se g.M.I. rsroy tog tslo angai :( +
chj7  For ynoean ltlis gdnelwil no t,hsi teh rpscose ythe altk uabot in eth iunsqeot tsme is biosplys cllynaoolp (tuhs het eussi fo uteillpm pipese).to +


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 +1  upvote downvote
submitted by rhizopusmucor(1)
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I dnouf th,is I kihnt ti gievs ndaik fo na apnxai:eolnt fI eth gnrieesosr fo log ')A/(A( 1-) no ol-g B is lnraei tihw a sople fo ,1- hnet itsh atsidince htta hte imnaotnsag si tvepietciom dna by dienitfino hte siagtno and ainostatng tac at the ASME ierongoictn etsis. oS ylabsilac eth mreo oyu dad Y, eht essl X si dnou,b wihch aesnm yhet hvae a asem rusclattru pnomcento oetp)ip(e and usmt cta on het amse sei?t tDno' nkow fi itsh kemsa esens...

t/cpa./1lshiaupitdm/.yhclrhbitud.es:bnfesnmue/ot~djgc/sabsgth/op

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 +0  upvote downvote
submitted by ∗stepwarrior(29)
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sthi tsoiunqe aws trteu SB, tbu eht awy I sjiutifed "msae tepe"ipso aws htta it iasd "ni het etncxot fo -mnsruaeti ",X .,.ei hihcw ppseetoi uwldo eahv been doedlvpee ni the noxettc of teh tsoedibani epte.srn t'Is nuekllyi hatt Xt-ain onibdsieta duwol idnb to eseioppt no Y htta rn'tea no X. utB yuo ucold raegu tehre era elcttarieoh opiesept on Y atth dclou be dnbuo yb enahrot dytibnoa ahtt eon'std xeist in ihts or.iceasn

eyVr radnw out adn otok em 5 tsmeniu to lcuytaal gufeir otu no eth st,te htnyoles a tesaw of item in ym ,nnipoio utb terhe yuo g.o

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 +0  upvote downvote
submitted by ∗peachespeaches(2)
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asecBeu ti si a shtitarg nwddrwoa ,oslep you nac also tlel ahtt Y adn X aer bunod ni msaliri sayw by .dsiibteoan Wath dsiteanftiefre hte o,wt e,hnt n'sti iotepep iningdb bai,piyltac tbu eht rcci.aoonetntn llA esle elqua twhi dnnibig stis,e eomr Y twhi an acnnghuing mtoanu of X lliw laed ot ssel X ,ubdno ni a :11 annm.re

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submitted by ∗ilikecheese(46)
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hgiH X is noudb ewnh owl Y is ,dadde adn wlo X si undob ehnw Y si d.Sdaode AMYBE yeht rae getopnimc fro eth esma ngdnibi toep/sepoipt deu ot ihts soilphneriat pet(p=ieo ydtionba idnbign ???)?t ????ies??

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submitted by ∗breis(56)
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oyur segus is as dgoo as ................e...........i....................n....m..................

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nala_ula  I tnesp so gnlo no isth seuqoitn nda se...am hhahaa +


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submitted by am.cassandre(0)
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aRn orassc a ueqsotni lmisira ot hist in eraonht uniteoqs abk.n In tath ,notesiuq tehre asw on ehacng sa hte inoeoatnctnrc of het wen oprietn saw ded,da hwhci antem atht eth two optnrsie did ton sareh irasmil sieppote. In stih ,onuteqsi eth adnitboy is tjsu ntgyri to dinb sti tio,peep so dandig mreo ro y samne lses gniidnb fo opnerti x cusaeeb the naitbdyo aforvs het isroeptn eht maes.

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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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