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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 ookl ta Uwdorl nqseutio ID 12992 ti sha a wflrounde ixeplnoatan rfo h.tsi If heyt saerh hte amse e,etspopi ti lwli vahe a rwddaonw I.posel f htye ahser none of the meas espitpo,e eht einl ilwl eb ntrolzihao sscrao eht rgpah nid(atnicgi on aehgnc as teh tmaonu of Y dddea cnessea)ir

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eacv  mgo ES!!Y stnkah Urwold I otg it cc!errto ayxclte iths xq asedk eht cxate iootpeps !itghn aHhaah I velod ti !! +9
pg32  vEne faret ginread teh lUWdro npiotnxal,ea I ma siltl tno rues hwo the asewnr atth r,sdea "ntePori Y sxspesree lal fo het sotpipee eepsesxdr by tnoierp ,X utb noiprte X osde "to.n.. si trcoenc.ir Beasd no teh ar,gph I ont'd ese a wya ew anc elur uto taht asnwre hccoei and it dussno rome eiyllk thna htob X nad Y avnhgi eth CXEAT ASEM peioet.ps naC oenyna ipxa?eln aWht wdulo het parhg look elik fi eht dueoqt rwesna coheci saw otercr?c +3
69_nbme_420  fI oyu maek up na elepmax thiw sunbmer, it rellay !hepsl niePot“r Y ssxreeeps lla fo het pteeoisp deepressx yb X, ubt rpetnoi X deos not erspxes all of ieesoptp dprxeeess by neitroP ”IYf . we sya eorpnti Y ash ipteespo 1, 2, nda .3 Tneh nireotP X sha petpesio 1 dna 3. nehT we nac cyarlel ees hte nielroishtpa eht UNOAMT of Y addde aretveli to X dbnuo ldwou NOT be .aleinr dtaSte aehnrto awy – ew need an xylptnneeoila rmeo munoat of Y ot OLTLCYEMEP nidubn X dan ofreheetr ehtre ouwld tno eb a noe ot one cneiitdop in eht hr mSalparigi ilocg sailepp rfo eth wasner oeichc thta tastes ipent"or X esresexsp lla fo het osietepp pexeesdsr by rtoepni ,Y tub eirtpno Y esod ton peesxsr lal fo hte espotpie eesesdxpr by notrpie g.. E.X fI pireotn Y ahs oeetppis 1 and 2. Adn eonptri X sha itpeesop ,1 ,2 nda 3. Here a,nagi ew have sftsaeidi eht erwnas ciesohc cinoi,ntdo nad no tetrma who muhc ew eneiscar opentri ,Y tpnreio X wlil lilts haev iptopee 3 ubndo in this csae. +5
69_nbme_420  ustJ ot lyrfcia rfo teh tfsri eiacnr:os We ehva 3 ioepestp on ,Y adn 2 tspeeiop on X. That aesmn, gsniuasm teh eetsoipp era lal tepsner in leauq tomn,usa fi I dda 003 ragms of pineort Y ot eht liunosot - lyon 200 gmars wlil ndib iptoren X. DAN YNOL 020 asmrg fo oenptir X acn be ou.nndbu Hoep teh sbenrmu ehpl! +1
fruitkebabs  Fro yodynab iltls kcust on ionteP"r Y seepsersx lla fo eth eepiopts espexrdes by eonitrp ,X utb teioprn X eosd o",nt ohauhtgl hsit tatnmeset amy be er,ut heetr si ton ohgune roinomftina ni eht uqeitson to poerv .iths eW know rfo atfc that cebsuae het uoAmnt fo dbeella X dnubo hcasree 0, ta teh eyrv ,satel eonitpr X dna Y eperssx het smea setpioep iesnc at a nrtaeic oe,tinarcctnon Y is blae ot etlelmpoyc ecpsiadl lal X ofmr hte tsemsy. hTsi ndos'et dlecuex eth sysbiitploi htta reeht may eb etxra etspepio no ,Y btu ti deo'nst rpevo ti hi.eetr +4


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 +2  upvote downvote
submitted by ∗amarousis(27)
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so hwo odulw eth aphgr okol ofr nprtoei x seexrseps lal of het ppsieote erexsespd by irnoetp ,y btu rtienpo y eods ont srpxsee lal of het oeppetis xdrpesees by oreinpt ?x

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drw  ehnt smoe atniX- ntoacn rateoelc to Y enve Y is dedda ta wtvrhaee ighh doe.s ta sthi ,nitnoidoc het nlie cna revne hctou eht i-x.Yas no the ,arytocnr if Y sreexsp all eeoptips on het X, btu X odes ton pxrsees lla petpoesi on eth ,Y atht aemns mose Y toeiespp are tno sene on .X at htis ctiioo,dnn I 'tndo nowk ahtw lliw be het leni okelod .klei +1
medbound57  I ikthn htat the sniel' awdrnowd seopl ulodw be tsee,rpe nices Y hsa reom tsise that the datnoiyb dwlou dbin .ot +

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 ioyabdtn can nloy goinecrez a sngeli toepp.ie ecSin ew ese hte roem Y ddade eslad ot essl X ,bnodu tenh ouy cna eoasnr hyte rehas eth msae bndiign sit,es dan Y si gopreriwenov .X

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srmtn  MGO this si het roeasn !wyh hatkn !o!yu! +
srmtn  tub ehter rea nidsbateoi atht can rtcaiten ihwt 01 lei.p.ee.ptoxmpsea .gMI.. rsryo gto stol iagna (: +
chj7  Fro naynoe tilsl wlelgnid on ts,ih het cespsor yeth aktl tbuao ni hte uneotsiq setm is slsobpiy lylalnpoco (usth hte suesi of ulpmliet peope)sit. +


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 +1  upvote downvote
submitted by rhizopusmucor(1)
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I nufod ihs,t I tnkih ti iegsv niadk of na apetnin:laox fI het gsresonrei fo log ((')/AA -)1 on l-go B si inelar wiht a sleop of -,1 hetn tish sdeaiintc ttha hte sonmaatign si ivmteicotep dan by nnetfiiiod teh nisogat nda natoaisgnt tca ta hte ESMA icrtnneooig iesst. oS lcislbaay het remo uyo dda ,Y hte sels X si ,uondb cihhw eamns htey haev a asem rcttrsluau tnoncpoem e)oetpi(p nad utsm tac no eth easm seit? Dno't know if hist ksaem enss...e

e/r/anbesadlntidubyt/h/ca1thsohigm/chjsgepspl~fmdtic..:so.btuu/p

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 +0  upvote downvote
submitted by ∗stepwarrior(29)
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this qseunito saw turte ,BS utb eth yaw I tjisedifu sem"a eispteop" wsa thta ti dasi ni" het notxtec of itn-mersua X", ,e..i whhic pipteose lwoud eahv nebe deodeepvl in het otctnex fo eht dentsaiibo tr.enpes I'st elunkyli that itn-Xa beitansiod wuodl inbd ot epistpoe no Y tath nt'era on X. utB yuo lucod graeu rteeh are erohicetlta ipspeteo no Y atht olucd be dboun by ahetorn dotbanyi ahtt tsone'd stxie in htis irae.nsco

rVey awrnd tuo nad okot me 5 umesnti to tcyalual figreu uot no the ,tset lyeshtno a sawte fo time ni ym ,pinonio tub heetr oyu o.g

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 +0  upvote downvote
submitted by ∗peachespeaches(2)
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aeuescB it is a raittgsh wodrdwna lsoep, ouy cna laso etll htat Y nda X aer odnbu in misrlia yasw by sen.oibtiad htWa farsinedfieett eth ,otw eth,n snt'i peoteip gbndiin ,taaciyblpi tub the niotcnearctn.o All eles aqeul wtih gindibn ,eists ermo Y tiwh na hnngunicga uotman of X liwl laed ot sesl X ,udnbo in a 11: ma.nner

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 +0  upvote downvote
submitted by ∗ilikecheese(46)
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Hgih X is obdun whne wol Y is ,ddaed nda wlo X si ubodn wehn Y is d deSd.ao EAYMB ehty are pgtmcinoe rfo teh aems bindgin tsppioe/oetp edu ot shti trniolhspeai ptieo(p=e aytodibn binndgi ??? ??s?)?eti???

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submitted by ∗breis(56)
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oyur uegss is as oodg sa ............e.........................in.....m...........................

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nala_ula  I enspt so onlg on tsih estqnoui dna e.a.ms. hahhaa +


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submitted by am.cassandre(0)
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Ran sraocs a qtuoines mlsiira to sith in anothre usnoeiqt bnak. nI tath t,nequiso rtehe asw on hcgane as teh eoncnntcitaor fo het new orptine aws ddea,d hihwc mante htta teh tow irntesop ddi nto rhsea silrami ptseeiop. In tshi nqiteso,u het nyobadti is jstu iryngt ot nbid tsi ieptp,eo so dgandi omre or y ensma esls dinignb fo itpnreo x usacbee hte yboitand orsavf the sepnorit hte s.aem

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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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