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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 you oolk at dwlrUo unqiteso DI 29219 ti ash a noeufdwrl tpaoanelixn rfo shti. I f thye ehsra the msea tep,ipseo ti illw evha a wdrdonaw pIefs. ol ethy ahsre enno of het esma t,eiopsep teh inle lwil eb ooanlhtzri roscas het hgrap incgndiat(i no echgna sa eht mtoanu fo Y dedda ei)crnasse

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eacv  gmo E!SY! nhkats Udorlw I gto ti orrectc! clextya htsi qx dakes eth taxec oieptsop htgi!n Haaahh I ldoev it !! +9
pg32  neEv tafre irdenag hte lUWrdo na,lpitoanxe I ma illst not rsue how het wsnare ttah sread, iP"noetr Y epxresess all fo teh piespote peeesrsdx yb trenipo X, btu etornip X deso to"..n. is rcirnec.ot asdeB no het a,hpgr I 'ontd see a way we nac urel otu hatt senraw ceioch nad it onudss eomr kyllei anht ohtb X adn Y vahgin teh XTACE ASEM it.pepseo Can onenya e?alpixn ahWt luodw teh arhpg lkoo elki if het outqed rasnew iehcco swa oe?tcrrc +3
69_nbme_420  fI you mkae up an xeempal wiht semrnb,u it ylreal ehs!lp P“neroit Y sereexpss lla fo het oseieptp pssexdere by ,X but iopnret X odse not serpsex all fo eppstoie xpdesrees yb Pinrote If.Y” we say ieotrpn Y ash iptsoeep ,1 2, nda .3 eTnh ertnPoi X sha tioeespp 1 dan 3. Tenh ew nac aeyrllc ees eth ipersitholna het MOUATN of Y daded raitelev to X buodn ldowu NOT eb r.niale ttdaSe oahertn way – we ened an noltnaplyeixe rmoe aonumt of Y ot LLPCYOTEEM nnidbu X nda rehtfreoe ehtre wdluo otn be a eon to one odpnetici in het apriighlSarm iocgl ealsppi rfo teh enswra iochce ttah astets torniep" X rsepseexs all of hte iespptoe spsrexeed yb niopert ,Y but rinotpe Y deos not seprsxe lal fo eth setioepp xpsreedes by rpionte .gX. .E If tepnroi Y ash steoippe 1 adn 2. Adn opitnre X sah petespio 1, 2, dan 3. Heer ig,aan we haev idtssfaie the rwnaes heosicc toic,dnoin nda no aermtt how much ew senecair pioretn ,Y ptieonr X illw ilstl veah opeipte 3 dubno ni isht a.esc +5
69_nbme_420  sJtu ot ralcfiy orf eth sftir ioanc:esr We vahe 3 soipteep on Y, and 2 poeispet on .X htaT sn,aem mnisgaus hte itpeseop rea lal tesrepn ni eluqa t,munosa if I dad 030 argms fo ioptern Y to the nusoilto - ynol 200 asgmr liwl indb roeitpn .X DNA NYLO 002 rgmsa fo tnoepri X cna eb .ubdnnou pHeo teh smbenru !hpel +1
fruitkebabs  rFo oyybnad ltils cksut no o"Petinr Y perxesess lla fo hte poesipte pexeesrsd by ronpiet X, utb entopri X eods ,no"t lhgohtua stih etasttenm amy be ur,et erteh is ton egnhuo nnaoirfiomt ni eth ontseuqi ot ovrpe i.tsh We nkow rof aftc ttha cebuaes het outAmn fo blealde X odunb rehcsea 0, ta the vyer eslt,a ritneop X dna Y esrsexp the sema tspeipoe icesn at a netirca otrotian,cennc Y si ebla to tmeocyepll lpdcsiae lla X fmro the .etmyss siTh 'tosden dxluece the iboysiisptl tath treeh aym be xaetr eisoppte no ,Y btu ti tsn'oed epvro it etei.hr +4



 +2  upvote downvote
submitted by ∗amarousis(27)
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so how udolw eth aghrp olko for nrteipo x psxeseres lal of hte petsoepi pexsdeesr yb rpetoni y, tub oeipnrt y dseo ont resxsep lla fo hte eitpsoep xepseerds by ptioner x?

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drw  ehnt mose nX-iat tnaonc oaterelc ot Y nvee Y si added at vrewaeht hghi soe.d ta iths nic,niodot teh ienl nca rnvee hcuto hte saxY-.i n o het yocatr,rn if Y pssexer lal osppetei no eht X, tbu X osed nto espxser all eeipopts on het ,Y ttha mnsae eoms Y peptieos rea tno sene on .X at stih nitdoci,no I 'ndot okwn wath will be het ienl oekldo kl.ie +1
medbound57  I ihknt taht het ni'els drownwad eposl ulwod be speetre, eincs Y hsa roem siets thta het ndbatoiy luodw nidb o.t +

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

+1/- prudvi96(0)


 +1  upvote downvote
submitted by ∗usmleboy(19)
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nA oatnidby can olyn riecgnzeo a lsenig t.eeippo eicSn we see het remo Y daedd eadsl to sesl X obdn,u htne uyo anc nseora hyet eahsr eht mesa nbgiidn tisse, dna Y is rwnoierpvoeg .X

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srmtn  GOM tshi si eth earnos !ywh hnakt !y!u!o +
srmtn  ubt ether ear boiinsetad atht nac acttnier thwi 10 lpsee..apmpiexet.o .M.g.I sorry got tlso iagna (: +
chj7  For aeonyn lltis nedwigll no hsti, het rpcsose htye atlk tabou ni eth onqtiseu esmt is sbysolpi looalcylnp s(hut eth eisus fo lupmltei eppto)sie. +



 +1  upvote downvote
submitted by rhizopusmucor(1)
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I odnuf t,his I hkint it egivs kidna fo na :ianxeplaton If hte srsroieeng fo olg ((A'/)A )1- on og-l B is nilera hwti a pesol of 1,- neth tihs tcseidina atht het gtaoaimnns is otmitpiveec dna yb dfnetiinio eht sitogan dna gaantntois cta at eht AMES erociongtin sseit. oS ayliacsbl eht mroe uoy add ,Y eth sesl X is bdon,u hchiw mesan they vahe a maes tulrscuatr connpmoet p(eotep)i adn tmus cat no hte aems ste?i noD't nwok if hist mkeas nes..se.

ctaylj1dogdth.i:dtabh/nbetpu.s/bepgshpnf/iuh/il/rsssum.~acm/ctoe

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 +0  upvote downvote
submitted by ∗stepwarrior(29)
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tsih uoesitqn wsa ttrue BS, btu the ayw I dtifiusej m"aes eopipts"e was atth ti dias n"i eth cntotxe of u-istanrme "X, ,ie.. hciwh eoppiest dwlou vhae eneb eodpdevle in the ntcxote of hte tadnobesii erpts.en tI's iknyelul hatt nit-aX ieidtnsbao ldwuo dinb to estoeipp on Y that tn'rea no X. Btu ouy ucdol garue rtehe aer cltitoheera psoeptie on Y atth locud eb bduno by toehran yabtdnio ttha t'eosdn texsi in tsih csr.iaeno

reVy ardwn uot nda toko em 5 nisuetm to ltucyala ufgeri otu on the etts, ytenlsoh a tesaw fo mite in ym noopi,in btu eetrh ouy .og

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 +0  upvote downvote
submitted by ∗peachespeaches(2)
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acseueB it is a hgtaitsr donadwrw eos,pl yuo nac aols tlel htta Y nad X rea dnubo in rlmsiia syaw by ds.ateobnii taWh feaefsndittier het tow, etn,h snt'i epipoet ibingdn cyaibtliap, ubt eht tnanoentcoci.r All lees eualq hwti igdbinn ,tssei mero Y hwti an ihacnunggn mnuota of X lwli aedl ot less X ,odnub ni a 11: rnanme.

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 +0  upvote downvote
submitted by ∗ilikecheese(46)
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Hhgi X si udnob hewn owl Y si ade,dd dan wlo X is obnud wehn Y is .oSedd ad EBAYM tyhe rae gnotmiecp rfo the amse dnnibig tppieo/tpseo eud ot hits espnilroahit (ieppeto= yadnitob gnidbni s??i)t????????e

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 +0  upvote downvote
submitted by ∗breis(56)
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royu gsuse is as odog as m............i......n..................................e.................

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nala_ula  I setpn os logn no shit sutioneq dan .e.mas. aaahhh +



 +0  upvote downvote
submitted by am.cassandre(0)
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nRa rcssoa a qieuntso isimral ot hsti ni tanrohe oqtusine knb.a In htat ois,qeutn eehrt aws on hencga sa het nteiortnaocnc of teh wen ptrieno aws a,dedd wihch etman thta eht wot sernptio idd tno ashre rmilais eppoites. nI htis isequ,otn hte batyiodn is tusj gytnir to ibnd its ipetpoe, so dndiag orme or y nasme lses inndibg of epnrtio x usebeac the adyntiob rosvaf het npsioert hte e.msa

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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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