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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 kolo ta orwdlU oensuitq DI 12929 ti ahs a ednwfuolr litxeanoapn for shi.t If yeth searh the aems sieetp,po it ilwl vaeh a drwwadno lo pesIf. yeth aresh onen of eth esma oep,sptie het ienl wlil be hoziaonrlt aossrc hte gprah adi(itnginc on hengac as eth otmnau of Y dedda aessri)cen

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eacv  ogm !Y!SE nkshta olUwrd I ogt it !errotcc etacyxl ihst xq dakse eth ceatx piptsooe tnhgi! hhHaaa I vdelo it !! +9
pg32  vneE afrte agrendi hte WrUdlo paoexnlaint, I am ltsil ton user hwo teh esnraw atth erdsa, oerni"tP Y pessxesre lla fo eth tppeseoi rxpdseees by onprtei X, utb onptrie X osde n.o"t.. si erc.iroctn esadB no the hprg,a I tdon' ees a wya ew nca rlue tuo thta snrwea oheicc dna it dsunso roem illyke athn obht X adn Y gvnhai eth AXECT EAMS eiseo.tpp nCa enoayn aplx?ien hatW lduwo hte rgahp kool eikl fi het oeqtdu raswen iocehc aws rcot?erc +3
69_nbme_420  If uyo ekma up an paxleem hiwt ,menubrs ti yarlle h!psle t“Prenio Y xessreesp lla of eth epopsiet dresespxe yb X, utb iorentp X oeds ont sexresp lal of eopsepti eprdssexe yb nerPoit .” YfI ew say noeptri Y hsa sieopetp ,1 2, dan 3. nhTe iePrnto X has ptieoesp 1 and .3 Thne ew nac acylerl ees eht sriiatlheopn eht OMUANT fo Y eddad vtrleeai ot X obndu luowd NTO be eirnal. tSaetd hernoat yaw – ew ened an tneopaeyxllni orem aonmtu of Y to EEPTCLYMOL iundbn X nad feoerther eehtr lwduo otn eb a noe ot neo iecpdotni ni het Smapr hriilga oiglc epsiapl fro eth wrsnea ehoicc taht ssetat nrpt"eio X xeespsres lla fo teh eitopeps xpseerdes yb enropit ,Y tub nritope Y eosd nto xessepr all of eht epetpios pedsrexes yb oiertpn .X. .Eg fI oetprni Y ahs ipepetos 1 nad 2. nAd nirpoet X sha poseepti 1, 2, nda 3. eerH gain,a we have tedaifsis the snwear hsociec dootcniin, and no ertamt hwo hcmu we ecnirase rtpnioe Y, rietpno X lliw sllti evha popteie 3 dbuno ni hsti cs.ae +5
69_nbme_420  Jtus ot yliafrc orf eth tsrfi :nseaoicr We aevh 3 eipspote on Y, nda 2 ipopeest on X. athT samn,e amiunssg eht petseipo rea all nsptree in uaeql oasntum, if I add 003 gasrm fo epntrio Y to hte ousiolnt - nyol 200 agrms lwli bind renopit .X AND NOLY 200 grmsa of optnier X can be udno.bun Hope eth beurmsn !eplh +1
fruitkebabs  orF naoybyd illst stcuk on itP"erno Y sxsesepre lal fo eht ppsieote serdepxes by pnoetri X, tbu rpionte X osed ,ot"n hutghloa hist tmnatseet mya eb t,reu htere si ton uehngo fnmriootani ni eht utsonqie to orvep ih.ts We konw orf tcaf ttah ubeecas eth oAnutm of dallebe X ndobu acsreeh 0, at het yerv et,sal oeitprn X nad Y sexprse the asem ipteoeps icesn ta a ectairn nrnceaitonoct, Y is abel ot omepeyctll asiecdpl lla X rmof the se.msyt iTsh 'tesodn edleuxc hte yoiistpsbli ahtt htere yam eb trxea psetepoi on Y, btu it tes'ond vpore it thr.eie +4


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 +2  upvote downvote
submitted by ∗amarousis(27)
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os who wuodl teh arhgp okol for etropni x esssexpre lal of the ptesoipe pesdeersx yb nrpetio ,y btu ritnoep y eosd ont xerspes all of the pieptsoe esspeexdr yb pnoteri ?x

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drw  nthe osme -tnaiX ctnnoa terealoc to Y vene Y is deadd at arhtvewe ghhi d.eos at hsit ,cndiitoon teh enil can reenv tcuoh the is.x-Ya on the tnory,cra if Y rsxspee all seoeiptp on hte X, btu X sdoe ont essxrep all eosppeti no eth Y, ttah emnas soem Y eitspepo are nto snee on X. at ihst oidtcinn,o I n'tod wokn wath iwll be the ieln dlokoe i.lke +1
medbound57  I tihkn ttha the il'sne rdwadnwo psloe uoldw eb ptrseee, scine Y sha oerm stise ttha eht tiyoadbn odwlu bdni .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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An botadiyn nac lyon rnozeiecg a lsigne epie.pot icenS we see the mero Y added alsed to elss X obun,d tneh yuo acn sareno hyte ehrsa hte same iidnngb sitse, adn Y is geovepinorrw X.

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srmtn  OGM itsh si het enaros hwy! hatnk oy!!!u +
srmtn  btu terhe rae aisoiebdnt taht anc catnerti whit 01 sxmpiel.ao..peetep .M.g.I ryrso otg ltos gaani (: +
chj7  For onayen ltlsi ginldlew no h,sit het cspesor thye aktl ubtoa in hte etsuqoin estm si ysbilosp aclplonylo s(hut eth iusse of elltmuip ieopepts.) +


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 +1  upvote downvote
submitted by rhizopusmucor(1)
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I nfudo t,ihs I tihkn it gvsie inadk fo an intoal:nxpea fI eth rsgoierens fo lgo /A)(('A )-1 no lgo- B is nearil htwi a elosp of 1-, ehtn this ienctidsa htta het nnaamgsito si itmveeotipc dna yb edifnition teh sgoinat nda aintnsoatg tac at het EMAS iongtncerio eitss. So slclyaabi teh mroe uyo add ,Y eht ssle X is unb,od wcihh amesn thye ehva a saem rctustalur nmonectpo ti)(peope nad utms tca on eht smae ?site n'Dot onwk if htis emkas n.es.s.e

~c.bssla//.ehmi./ogse:dcahlenmnrtbtoys/tp/fjs1hptpgibuhaud/tcidu

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 +0  upvote downvote
submitted by ∗stepwarrior(29)
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siht ostqienu aws trtue S,B utb eht ywa I tuijfdise maes" tp"peeois swa ttah it disa n"i het ecnxtto fo m-uiatrnes ,X" ,i..e iwchh ospiptee ouwdl aehv eneb evelodped in the conetxt fo eht tndsaeioib e.petrsn sIt' lenyulki ttha itaXn- sdeibatnoi duwlo ibnd to tepipseo on Y ttah 'eartn on X. Btu oyu udolc rageu rtehe era treiclahote eepspoti on Y htta oulcd be nbuod by rhoenta yindoatb taht tn'deso xsite ni tihs cs.eaiorn

eVyr dnwra otu nad otok me 5 iumtsne ot atyulcla gurife otu on eht ,sett elthnsoy a asetw of meti ni ym ,pniooin ubt heter uoy og.

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 +0  upvote downvote
submitted by ∗peachespeaches(2)
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eBecsau it si a sthigtra aordwdnw ,olspe uoy can loas llte htta Y adn X rea dunbo ni lmriasi aysw yb esatii.bnod ahtW fedatsienftier het ,two ,thne si'nt ipoptee gbdiinn blyptiaa,ci tbu the ctor.cionnntea llA esle qealu with nnibgdi sesti, rome Y thiw na niguanhngc autmon of X llwi dale ot sesl X ,bduno ni a 1:1 e.ramnn

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 +0  upvote downvote
submitted by ∗ilikecheese(46)
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higH X is nboud hewn low Y is eddda, nda wlo X is unbod wenh Y is eS.d odda BYAME hyet ear cgomnteip rfo the eams gnbiind otpsppeteo/i edu ot htis sarnpietoihl pop=(eeti aonbityd nidngib ??e?)st?i? ?????

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submitted by ∗breis(56)
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ryuo sseug si as ogdo as ........n.........................................i.............m..e.....

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nala_ula  I ptens so gnlo on shit stequoni nda .em..sa hhaaah +


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submitted by am.cassandre(0)
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Ran csraso a usneqtoi rmsaiil to sith in trehaon oenqisut nkba. nI that oequt,sni erteh aws no aehgcn as eht coanontietcnr of eht ewn tpieorn asw d,edad hcwhi eamtn ahtt eth otw tinoespr idd nto reahs lsiaimr .ppeeisto nI tsih ,esuqntoi eht badoyint is usjt ginrty ot bind its to,ppeei os ndagdi omre ro y measn essl gndiibn of rietnpo x cbeesua hte yiadbnto vrofsa teh erospnti the as.em

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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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