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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 oklo ta rUdlwo usqenoti DI 92192 it has a rnfuwelod oentianlapx ofr hsi.t If yeht aeshr eth aems ,poteespi it lwil avhe a wddraonw . peIslof yhet raseh oenn of eth same i,steepop teh ilen llwi eb rnhaoziotl ossarc hte paghr cd(giianitn no cnehga as hte amnuot of Y dddae saescine)r

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eacv  gom !!EYS ksthna odwrUl I otg ti e!rrocct xyaeltc sthi qx easdk hte eatcx pipoesto thgi!n ahhHaa I veold ti !! +9
pg32  Eevn tefar engiadr the dlrWUo eaoxinlp,atn I am litls ont esur who teh esarnw htta eras,d ne"itroP Y esxrpsees lal of eth eppsitoe rdesxpese yb itnoerp ,X ubt enpirot X esod ".to..n is tcc.eorirn Beasd no hte h,pgra I tond' ees a awy ew can erlu uot that wrnsea eicohc dna it nssoud roem liykle nath thob X adn Y gvniha hte ETXAC SMEA isete.opp aCn nnaoye pnlaie?x hWta uolwd teh ahrpg oolk lkei if teh edtqou rwneas ceihoc was ccort?re +3
69_nbme_420  fI ouy amek up an epamxle itwh numr,seb ti yalelr eshp!l Peiront“ Y pxeesssre lal of het tseoepip predexsse yb X, tbu oneritp X edso tno sserepx lla fo ppeitseo edserpsex by tPnoier fY.I” we sya ntirope Y ash tepspieo 1, ,2 nda 3. eThn rnoeitP X sha ieptesop 1 dna .3 heTn we nca rlelyca see teh erspiniotlha the NUTMOA fo Y eddda eaetvilr to X dubno oluwd NTO eb a.reiln tedaSt arhnteo ayw – ew deen na pxiteelyaonnl mero oumnta of Y to OEECLYPMLT ndnbui X nad ftreehreo ehtre odulw ton eb a noe ot oen iodntciep ni hte lhmgara Sirip cigol ippesal for the rswean eccioh hatt satest r"tnieop X sesxseper lla of teh tespeoip rsedsepex by retopin ,Y btu ptoreni Y eosd nto sreexps all fo hte ieptepos dpeserxse by optinre XE... g fI poertin Y ash epeoipst 1 dan 2. Adn etpionr X has eisopept 1, 2, nad .3 Hree aiag,n ew heav eiaistsfd eth sawnre cicseoh itdonnic,o and no aetmtr ohw hmuc we inacrsee irtoepn ,Y iptoren X will llits vhae poetpie 3 obdnu ni sith as.ec +5
69_nbme_420  tJsu to yacifrl orf the tfris :oicnaers eW evah 3 iepsptoe no ,Y adn 2 opsiepte no .X thTa a,mnse masisngu teh iopsepte rea all neepstr ni luaeq uostn,am fi I add 003 sagmr fo oipnter Y ot eth lotonsiu - oyln 002 smarg wlli dbni tepirno X. AND NOLY 200 gasmr of neorpti X nca eb uu.nodbn eHop eth esrbnum le!ph +1
fruitkebabs  Fro anyybdo ilslt uskct on Pin"tero Y repsxsees lla of eth tpoeeisp resxedesp by noritpe ,X ubt itonerp X esdo tn,"o hatlhgou itsh tttenemas yam be ,ruet rhtee is tno ueohng riotnonfmai in eth uoqinets to povre .siht We kwno rfo ctaf thta suebaec het Aumotn fo ebdalel X obdun cseeahr ,0 at eht very slt,ea epitron X dan Y xsserpe het mesa epopesit ecnis at a ireactn ocina,ncttenro Y si ealb ot ytpmeoellc icpelasd all X romf het esystm. isTh tends'o ldeecux eth biisptiosly ahtt rhete aym eb xerat ptoepsei on Y, utb it dtos'en rvope it .ethier +4



 +2  upvote downvote
submitted by ∗amarousis(27)
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so who ludow eth prhag loko rof enptior x spxssreee lal of eth eetpopsi xeesrpesd yb otepnir ,y tub itnoepr y seod nto srespxe lal fo het ieepotps sperxseed by itrpneo x?

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drw  htne meso tXina- tocnna ceoltaer ot Y vene Y is ddeda ta wehrtaev ihhg .seod ta tihs icnt,odoin hte nlei nca never ochtu the x-.aYsi o n eth ,caytrron if Y erxessp lla pisopeet on het ,X tbu X esod ont ssrpxee lla iepestop on the Y, that nmaes esom Y soppiete era ont esne no .X ta htsi t,inonodci I nd'ot nkow whta wlli eb teh nlei eodklo lk.ei +1
medbound57  I itnhk tath eht lei'sn aonrddww ploes udwlo eb eerst,ep escin Y ash orem siste hatt hte atbyiond wlodu dibn t.o +

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 toinbyda nca noyl reicengoz a gniesl e.iptepo iceSn ew see het remo Y added ladse to slse X dnuo,b hnet you nac sneroa heyt hraes eth smae bgndnii et,iss dna Y si eovinerprwog .X

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srmtn  OMG itsh is eth raneos yh!w ntahk !o!!uy +
srmtn  utb rteeh ear sieidontab tath cna etarnict thwi 01 i..tepplxs.amopeee g..I.M rsryo ogt ltso nagai (: +
chj7  Fro yneano tsill wellgind no ,sthi hte erspcso teyh klta tboua ni teh qenusoit tsme is ssbiylop poonllcyal (uths the ussie of eiutlmlp itspoep).e +



 +1  upvote downvote
submitted by rhizopusmucor(1)
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I udfon ,stih I tknih it vsgie iadkn fo na ilxoanatnp:e If eth esersgoinr of gol )((A/A' )1- no g-ol B is arleni tiwh a opsel of -,1 thne shit icdtsneai that het mantaonisg is eotipvctmie nda by intfedioin eth gsiaotn nda snaotitnag tca ta hte SEAM ioergtcnnoi sseit. oS lsaayibcl eth mroe ouy dad ,Y teh ssle X is n,duob cwihh nmase eyht vahe a msae rutcuatsrl oemtnocnp eioep)t(p adn must tac no the emas ?iset nt'Do kwno fi hsti masek e.e.nss.

lanuobesspbbmriflitdahta/geutpsh./o1.pcchet~dhgyun//dmct.i/:sjs/

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 +0  upvote downvote
submitted by ∗stepwarrior(29)
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hits oqtiesun aws rtuet BS, utb teh ayw I tdjsufeii mes"a o"eippets aws ttah it aisd i"n the tecxtno fo ntmareus-i ,X" i,..e wihch eptspoie ouldw aveh enbe pdoeveedl in eht xoncett of teh ibiadetsno .rpstnee ts'I lkeunlyi atht it-Xna ntdaebosii lwodu bdni ot tpsoipee on Y atht a'ernt on .X Btu yuo ocudl euarg hreet are tieloaechtr seiptpoe on Y taht ludco eb nudob yb aenhtor ybadtino htat 'donste stxie in isht acsori.ne

eyVr rnwad uot dna took em 5 esutnmi to luayltca refiug tuo on eth t,tse lsethnoy a teasw of iemt in ym oi,ionpn ubt htere oyu g.o

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 +0  upvote downvote
submitted by ∗peachespeaches(2)
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eesBcua it is a astirhtg wdrwando ,oespl you anc aosl eltl htta Y nda X aer dnuob ni lirasim wysa by aoisdbtien. haWt aitreensteiffd eht t,wo enht, nsti' piotepe ibndgni cyi,lptiaab ubt teh ionorentct.cna All eels uleqa htiw igibndn ie,sst rmoe Y wthi na iaugnhngnc amntuo of X liwl aled to essl X odnb,u ni a :11 namr.en

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 +0  upvote downvote
submitted by ∗ilikecheese(46)
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Hgih X is nudob nweh wol Y si ad,edd adn low X si odubn nhwe Y is dSa ddoe. MABEY thye are ngitmcpeo ofr the eams bgdnini ippsttoeo/ep ued to htsi eilphirntsoa p=ip(oete botdiyan ndignib )s? ?t?ie???????

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 +0  upvote downvote
submitted by ∗breis(56)
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uoyr uesgs is sa oogd sa ........i............n.......................e......m....................

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nala_ula  I stnep os olng on this steiouqn adn .e.m.as ahahha +



 +0  upvote downvote
submitted by am.cassandre(0)
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anR arssco a tiosnque iisrmal ot ihts in aontehr eqsinuto ka.nb nI that qs,otineu htere was on eghcan sa het nnionctertcao fo eth enw rtepnoi swa d,dead hchiw tname ahtt eht wot itenrops idd nto searh imarsil peisoetp. nI tihs is,utnoqe het bdyatoin si tsju yigrnt to indb sti ioee,tpp os adgndi mroe ro y snema ssel ndginib of nroitep x besucae eht dantiyob asrfov teh spinreot teh asem.

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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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