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Retired NBME 23 Answers

nbme23/Block 1/Question#22 (reveal difficulty score)
An investigator is studying the adverse ...
Presentation of antigens to CD8+ T lymphocytes 🔍 / 📺 / 🌳 / 📖
tags: immuno repeat

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 +11  upvote downvote
submitted by sajaqua1(607)
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MHC I ocfnntiu si raeilgtn ot rcanec ieons.spprus CMH I sildyspa oyeulsgnndeo zdehteissny tepirsno dna enpsetrs hetm ot DC8+ T s.clel hTe rueflai to lsidpay CMH I, ro CMH I ypadlsi of nleofs-n da(n by sxtnieone aoccr)unse nistpreo etrrsggi a lcrellau eimnum nresspeo, lidgnae ot nrtideusoct of het cl.el

hTe opetaoerms is deus fro eht atgrieadnod of wron uto, ts,eescenn or lfrdmamoe psrtieon. As ncrcea opeevd,ls eorm tmauiosnt edal to screadnie ongrw o.ipnsret ynOl yb ipoxerssen of hte ,eratspoemo ro tsi neoxve,isso-rerp can ehtes unttma trosnepi eb earddgde afts hungeo to otn be sdpliyead by CMH I dan lead ot the clel enbgi iekdll. Boorizmtbe boclks het mprtsea,ooe os the tmuatn iteospnr aer sdpidleay on eth craus,ef nllawiog eth uemimn temyss to ngeziecro nad lkil oalgthloicap .selcl

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catch-22  noAhrte ywa to poaraphc ti si ot tknhi oabut MHC cslas I .nrgsospiec ilclasaB,y if oyu ihtbiin the pearoeosmt, depsetpi iwll ont eb degaterne nda ntihnog si vbaalieal ot be eoddal ntoo MCH I mrrembee( CHM I has ot eb doaedl ebfreo its' otsedtapnrr ot hte lelc ruesfc.a) Clels ahtt tod'n sexprse CHM I egt llekid by het rntuaal .krls lie6..1w./P/ptc3llwns24h/ht:pote2w/r/7M/nv.gmsniiimcbaCc +32
kai  In" lcuscino,no ew eavh teadnmrtedos ttha eth smrteooeap trinhiobi bbmetzooir sauotr-ewdngle sscal I nad snachene teh yiseinivstt of amemylo ot NK mll–eddeetaci sy"sil from teh solnoncuci fo hte INH pprae +6
maddy1994  ronthae hiammscne is by kogbnlci oresptoeom u vnee ecdrasee dieragotn of potaptoprcio p.n.rositsoe. ti enscachen opsiratmspoo(f ud)owlr +6
azibird  uBt C8+D and KN lsecl ilkl via oprfnei!r yWh is tshi rsawen nro?wg sI it bcseeua s'ti ton hte raimrpy cftee?f +2
testready  hT"e etsoeaorpm is teh mjrao cersou fo eotyrlcopti ctavitiy envolidv ni eth rtaegenino of psdeipte fro nnrtiesteoap by omrja tbipoiiiotytamclsh oxplcme acssl I slol.mceeu eW operrt eth enw onbaesvitor ahtt bzrtoeobmi wag-teunrsdoel AHL sclas I no MM cel,ls stirgenlu in esirencad KN caeddeile–lmt "i.l ssy3/tmnec4i/c/./mnMhChollsib7p/62w./iatw:P2s.cgtvr1npw. +
fatboyslim  I tikhn waht OP idas ditncasrcot htwi awht th-c@2ca2 idtce ni eth bMPdue eria.tcl +
an1  OP idas "nOly by oenexpissr fo teh etaoorspem, or tsi eoiep-r,ovexnssr nca tsehe mtunat oesptrin be gdedared tsfa ghuone to not be ydapliesd by HMC I." WU IQD 16714 syas taht a eiornpt nsgreeuod iardaneogtd by eht iitiqubnu premoeaost aawh,tpy feart hihwc ti osge ot eth RE and enht si setreendp ot het lcel sruaefc for MCH 1 esernpos neglaid ot oppisosat aiv oesmrpfr adn geszyran.m naHgiv a metoeapsro intoirihb dluwo clalatuy rnvtpee teh HMC pnoeress bceaeus no rosietpn rae ipdy.sedla oAsl etno atht eht euinsqto sysa hciwh esrcops wlil eb dtefa,ecf ether si on etnmoin of sacerien ro e.cdaerse So ,esy eth CMH /1 8CD paysawth is ,fcetedaf tub st'i laytlacu onwd ege.durtal nA enescab fo MCH 1 ldesa to KN clel etaeiddm e.tadh +

"Studies have shown that proteasome inhibitors block the assembly of MHC class I molecules and this is almost certainly because they are stopping the production of presented peptides that are needed for this process (6)." https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3094101/



 +5  upvote downvote
submitted by tinydoc(276)
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/btU/3shzm.yo:heHfJt/ItRpuu5

AMO of srtoeeompo tirhisibon fro M.M RDTL: si taht yeth cllyaibsa lbkco het pormsotoee mfor icnungnfoit os tath memyaol sclel a'tcn lcceery ipsontre t(hey kaem a nto of hmte) dan nehw heyt 'acnt eb ecryecld ehyt ubidl pu dna thsat oicxt to eth clel adn ti is.ed

yoebnd htta teh nsuteioq is lblsycaai nsikga fi the hnnibiitoi of mseorpeosto nist cpceiifs to hte Melymoa clels nad ti ihdbeniit hreot lcle's stoompesore thwa wduol be de?feftec

HMC slacs I si etrenps on lla acuelndet sclle (lla lclse ni hte bdoy xpeect CB)R nda ncofntui ot espertn egenuosnod teiansng ot DC8+ t lselc to eb ysrdoeted for( eeplmax rialV NDA ni na eifcndte ecl).l eTh yaw yhte do htis si yb knatig hte rteopni ti snede ot pentres dan kirbaneg ti nodw onti chum aelmlsr ptedpei anichs (os it nac ift on het M.CHI If shti ptes wsa bhiietdni in ehtro lcles ethn eth hte Pennetirtaos fo MCH I unwldto eb laeb ot eptesrn irthe enigants ot 8CD+ T clesl and aurtalN lilker .slcle as het nosetiuq smel.ipi

heT inqetsuo asw psreu crkyit ucbeeas fi oyu n'tod wokn hwo seomoeortp sithioinbr okrw ethn uoy atsrt okngiol orf an snawer htat lodwu axneipl hwo tyhe lodwu klil umort leslc as wll.e I ogt ti wogrn o.to tI rudiqere nleokwgde of the yaw MCH I sseneprt ep.dsptie

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 +4  upvote downvote
submitted by krewfoo99(115)
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Wyh ulowd fornsreip eb hte rnwog nwer?sa ouWntld ucniauomctla fo oixtc iropenst ecuas eth ellc ot dgronue pipsoasto ?

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ergogenic22  eomtbozirB deos nto edcltyir aatceitv ronpr.fei It yildetcr bithnsii eht moeoarsept iwhhc → belsane 8+DC T lscle to tiitiaen pooaistsp → iva foenrrpi laesere n(i sseeecn a awmterndos fe)fte.c +4
drzed  aExytcl, ti grrseigt eht llesc ot ngouder psstoapoi hwhci seman htat it anc eteirh be cell admdetei rio(epnfr nda emrzaygn vai SFAF/L)AS RO it culdo sloa be rghhout eht iricistnn tawyaph .ge(. cd;tnlromhoaii hroycoetcm c) +
powerhouseofthecell  uQn:eoits tBu who od DC8 lecls heav a eolr in hsit prcssoe ecatyxl ni the vneti?teg sI ti ignasy tath hewn eht steprnio dluib up, nloy ehtn do CD8 clesl ceom and itdnsea fo HCM I etpgirnens ot ,asoosemrtpe yeth ntsrepe it ot D8C to niiitaet otapios?ps +
flexatronn  oc@feoeseelwhrotpulh s o it lla esog kbac ot bisca nimmou (i tgo htis onwgr dan tup sspitpooa as elw)l tbu tfera reegwvini evtlnear anik rcdsa, i won get . Stoi sarpeteomos ekrba wnod aetgdg seportni within hte llce d.nseon)(ogeu eTh doebakrwn duoptcsr egt tenak up by sortaptnr catisaedos whti gtainne egsicoprns T(P)A dna hugtrob ot het ruhgo ER. ehT knbewdrao rtduspoc are hent aoeddl tono HMC I lmuceloes nad gotbrhu ot teh reaufcs fo eht cell. hnWe kihntgin uotab MCH ,I hiktn tabuo C8+D T escll FA( MHC 1 x 8 = DCo8 .wN ot uizeam,smr wneh sunig a trepemasoo onbhrii,ti ouery' libokcgn ttah gigtgan dan HCM I gidloan coesspr. As atdest oefr,eb 8CD sonezecrig CHM I h(whci tw'no ahppen hwne gnisu ehest )urgsd +3
whosdaprincesss  retfannlxo@ tahkn uyo !!!! +



 +0  upvote downvote
submitted by abhishek021196(119)
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Bbieoomz,tr orzmfbcilai

ihmcMesan = Psmoteeoar bnithiiso,r cuiden satrer ta MG2- eaphs dna apiotsp.so

eUs = Mutellpi oelm,amy ntaeml ellc aom.ymlhp

dAv Etsffce = eparrePhil aounpyht,er eseprh esrozt eacnvrtoatii

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tyrionwill  nurde iotBebrz,mo eth ertoaesomp tacnon igtdes arilv Ag dna eeprstsn it ot hte ndbmbo-aenmdeer -IHM.C Teerfohre CTD-8c ntanco zoceingre the shot cells incaotingn sreledap VV.Z Taht is brbyoalp hyw lishnegs is eon of hte ppolrau dise efeftc of B.orotezbmi +
kcyanide101  The udgr sthniiib oeoemstrp.o nHeec etrhe is on rmftange llbaivaae ohgruht ATP eniids D4C elcl ot aldo onut MCH .I... As hscu the D8C naterinetops to clleT si tndper.vee Teh cmcunuaaltgi nitsrpeo idneis hte CD8 csell hcwhi are otn binge obrkne ownd by eht tmropeesoo sueac it to ngoudre tisaosppo +



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