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Retired NBME 24 Answers

nbme24/Block 3/Question#46 (reveal difficulty score)
A 15-year-old girl with cystic fibrosis has a ...
Endoplasmic reticulum 🔍 / 📺 / 🌳 / 📖
tags: cell_bio cell_transport cell_trafficking protein_folding

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 +7  upvote downvote
submitted by vshummy(184)
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I kitnh eorm g,reyallne pnroite fgolidn shapepn at teh RER and teh etsm assy het oneptri dto’nse dolf ppeol.ryr iye,lifacplcS eht tmos nomcmo CF umoittan is a edomlisfd itornep dan het tiropen si ridetnae ni eht RRE dan ont edarnrosptt to the clle manrmebe - FA 1029 pg 60.

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uroosisyed5  ihhWc skmea snese fi ew kntih tbauo eth yhpsatpho fo dteeeval lC- dan Na acirlunlyartl.el hoBt fo etseh onsi go pu isdine het clsle eud to hte intneetor of hte sefdmdoli otpenirs ni eht R.ER +
lilyo  I altlayuc eireadsg wiht hits er.goinans eTh pyypioltghoosah ni CRTF is otn eud to uoicumtnalca fo ldsiedmof oensip.tr It si deu ot es/etnaebradsdce PTA taged terambaensrnm hrdleiCo nnla.hec ngAdrcoic to wUlord, eht dmedisoc nioeprt si eddetcte yb eht pslamdoncEi t.lRceimuu eTh bomaarnl ptienro is eeradgtt rfo ritduocnste yb teh marteospeo adn reenv raesche eht ecll fcser.au hereT is NO oniettnre of oidsfdlem ptne,roi heetr is aeidotdgnra fo smdedoifl ntroiep and oeerfehrt acebnes fo ieldcrho ncenalsh no the nemmbae.r siTh si twah asdel to pimeirda vramleo fo astl from the aetsw sa lelw sa esadrcede NCal in .usumc I odtn itnkh teh ewasrn lhdsuo be .ER aCn naneyo ellt me fi I ma imngsis netisgmoh ehre ttha amkes eth wsraen ER as doppose to lamto?scyp Beacues eth wya I see if si idofedlms orsnitpe go mfor the RE ntoi the symlatopc ot caehr het teaesomorp dna tnhe eb uertedtdc.s roUdwl osnstiuqe ID era 8,50 ,028 ,5114 dan 3.919 +19
drdoom  loiy@l hTe CTFR si a tmesnanramrbe eonitrp. iLek all ,eopsrtni tsi inonraltats sgbnei ni eth lsy;coot atht a,dsi RCTF nonsacit an eN-mtsriun gisla“n n”seque,ce hhcwi amesn sa it si egbni lstr,edtaan it nd(a het omoirbse ginkma !ti) will eb rdoserpantt to teh Ecdslnmpaio in!Rtelmuftoou.^toec As ti tgse dn,eatalrst tis phchioyobrd mtfios lilw ,eegmre ihwhc seedbm eht CRTF tronipe twihin het opsolhdiiphp beyliar fo het RE te!fsil hTat menas teh pinoetr illw rneev ianga be uodnf in“ het ”ostcylo ebascue it tesg erhaeddt urhotgh eht byreial (hchiw ,si ni fcat, ohw lal aarnsbmetnrem nreiotps cbeoem nmarmseerntab psrointe ta eht llce aresfcu -- yhte ehav to eb dmae tino manmrsbenrate prseitno in eth ER tfs.r)!i +11
drdoom  @lylio diouennc)t( So, yse, aeitt,yulml eehst iloefddms inrpesto wlli eb rddcetei wrodat a rtepmaoeos fro niarc,lgreciogeddt/nya but ttah lwil anphpe sa a tellit iveslec r(o ooep“sl”im;) het lddfmoies rnit,epo ni tshi esc,a si nto leulraobewts- ,s(enic by neitoni,dif it sha byhhcpdooir tfmois whcih get dd“heatre ouhhtgr” a iaybrle ot rcetae teh msranbneatrem ,trptn)ea hwich emnsa uoy not’w nidf ti in het ocyslt.o +6
drdoom  foto!^oetn : ehT votmemen fo i*vctae iebososmr mrof eht lsotoyc ot het imasonElpcd iteRuumcl is wyh we acll atht aear fo RE r“hogu maoipscdnEl luumtiRce ;r)E”(R no elnetocr ocmi,ocyrps ahtt eotsnic swa bekcdepsle whit tlitle ;stod letra, ew mnsah)u( edscdoirve taht stehe stdo were smsrboeo!i +1
drdoom  * By ic“vtea ”oiosmer,sb I tujs neam orbmoisse in teh eoscrsp fo teognncvir mNRA ot rn!etiop taWh( ew call n”n“raostalti ;) +1
wrongcareer69  oHw anym odndmag syaw rea tyhe giogn ot estt su no .FC m'I os eorv !this +2
furqanka  sloa in A,F nerud paalh 1 yni,triptnas ist sysa fio'Mddsel ngee odcprtu rineotp etesaggrag ni poelhltalrauec R".E ghmti eb het asme ecpc.not +9
joanmanuel26  gAodirccn ot aln;paK llA spitnoer ttah ear shynieedtzs in eth RE sutm dolf loycrtcre ni drore ot be rsarnetdtop to teh gloig pratusaa nda neth ot ehtri aflin .iinotsndtesa fI hte mionautt uaces a lmisodefd opneir,t het serltu lliw be teh sols fo het repoint cfunoitn d,an ni some ,cessa tmluauoaccni of het rtpneio in eht .ER +1
drdoom  @lyoil nhikngTi utboa this mo.re oYu wlli otn idfn eht mfes)liod(d teorpni in eht oltc.yso Teh dfdsioelm otepirn amy be nsidei a deoorstnapem—a a meprootase yma evil in eth utsb—lcoyot the dsefilmod ternpoi lfitse illw rvnee parpae ni het oltos.yc eTh supcrotd fo sit aanetddroig thgim (ttntseunoic nmaio idsca ro lmsla p)etdpeis utb fi uoy dha na atdybino rof teh ofisddmle pntoier dna dseka it rW“hee si eht dlifmdoes rine”pt?o, het yndoabit wdolu enrwsa: Mo“ts of waht I olcud nidf peaasrp ot be ni eth .REr” +
yesa  ekhcC uot het xicnaenl y,clec usulyal rpitseon taht ear edma in hte RRE adn ieflmdosd get deagtg nad elodefrd'' dna enht edasncn anaig rof rperop .ndao.gdnfl.i if tyhe yllrae nact' be re,lodefd 'trheey deraeddg ethn adn t!rehe oS eht nylo pleca oddmflsei CRFT dlcuo aculacemtu if osmdiedfl ..RR.E..si.. inLk( ot nilnxeca l:eycc _2=sO7pbvbsIhmoa/VrV+apQgLnDh587m4w7I9m6ep0aO=m;;.reIAeE58b.==&j&UfgoK1eX1axasovrIcQHm2w;7lcgAA8K/iH9yjlZrT;cim;saQluk3&U&p4=5ohHhioarBae03gs0wmR1AmaaY;smiFjuQ&UbmhgpnMLicAsq;a5:ox2wt=d=QeUg=9X&28=Zr4tK&Me+ss1PE:whmYWgBp8CaaD?DCicU#pthhtwe/rp) +
amy  F202A0 74: " ntbsAe or souafyldcitnn SPR nsgla(i onncgireiot eiplt)rca rultsse in cuminalaucto of pnteoir ni the oloc"yts +
drdoom  my,@a a’ttsh a ogdo itonp but ti asseusm hte oinetpr is ereitswoh lroa,mn ei.., otn ofelisdmd ro ”oanmblar“ ni emso throe ywa +

For a great little summary of the Endoplasmic Reticulum (and many other concepts in molecular biology!), see this from Alberts’ Molecular Biology of the Cell: https://www.ncbi.nlm.nih.gov/books/NBK26841/#A2204

+/- drdoom(1206)

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 +4  upvote downvote
submitted by seagull(1933)
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I veha an ussei twhi shti qetusoin hihcw olsa scntcofil hitw UoWl.rd nI erord to be drgadede yb otsosreepmo eth sddioflem inpreot lduow edne to eb neerpts ni hte olctoys ofr nouuinitab. It ti taucmudclea in the ERR hnet who edos ti tge aggdte? nyes,Htol so ftn.ecdo.i.cl

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sajaqua1  oS larinyidro a dedlsomif erptino esdo reongud bqinauunititoi adn itepsosylro. It si baeelton htat CTRF isidmflnog o'dtens vnee aollw ti eeacsp het RE, so it cmaalctsueu ni the ER +9


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 +4  upvote downvote
submitted by drdoom(1206)
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The TCFR oeirpnt si a rmnbaetmasner eoit.nrp keiL lla rpeiostn, sti anotitralns egnibs in eht oslcy;ot that adis, TFCR aocintsn an sn-riuNmet lnai“sg ,ceesque”n hcwhi nmsae sa ti is gnbei rteatlnds,a ti a(nd eht oeiborms nmkgia t!i) lwil eb proerstdant ot het pcnEmdliaos .lecu^umiRtte!onofto

As ti tges ,lsandattre its yrdpcihbooh sotifm wlil mreeg,e chwhi mesebd eth RCFT rnepoit twihni het pphlpoiihdos yerblai of eht ER e!iltsf aTht msnea eth etrnoip liwl evren iagna eb odfun “in hte l”osctyo ausceeb ti segt ddeehrat ugothrh het yriblea hw(ich si, in ,ctaf hwo lal ntsemrabmenar oespntir ceoebm tnraermamesbn iosternp at eht clle sefuarc -- hety evha to eb deam nito aerbtrnmnaems soeirnpt ni het RE i.fts!r)

,oS s,ye tmyileut,al teshe difsmldoe stiroenp lilw eb idrteecd todarw a tpmeoosrea orf ieolncca/ggyn,dredarti utb hatt lilw hpeapn as a telitl levcies (ro oi”em;plo“s) teh elfisoddm toinp,re ni hsti ,saec si not sweru-obellat (inesc, yb tde,iionifn ti ahs irhcdhbpyoo simotf cihwh get arhddeet“ hhruogt” a riaylbe ot earcte eth srebtnrnaemma ptr,tena) iwhhc emsna you tnow’ nfdi ti ni het y.tcoslo


\ n!etoofot \ hTe chithgni of teia*cv obrsoseim to het lcaEidnpsom eimtucRlu is ywh ew clal ttah eraa fo RE h“ogur iasEmnpoldc ectmluiuR ;)(r”RE no lnocteer oi,mrcocsyp atth tcenosi saw dbeclkpees with ltteil ;dots tl,rea we a(mhnus) ecedirovds htta sehet tdos eewr eirob!msso

\ * \ By “taicve oe”brois,ms I usjt eman roeossbmi ni hte csoeprs fo rnvtiogecn ANRm ot tiroep!n tWah( we llca oastnni”a“rtl ;)

orF a greta tilelt msmyrau fo the opmnidElcsa mceuiltRu and( amyn orthe ocpnestc in aclrlmueo igoybl,o!) ees itsh ormf letbrsA’ aeMlourcl ioylgoB of eht lCel:
o28.AtmB:v6N/kos4inwK/h.p0win.tc/hbg212/o/n.w4sl#b

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drdoom  ^ mI' tsuj erin-gsatt ni eno mtenocm waht I rwote ni muteplli onmubctessm e:oavb se9wr.sebm/3#s73opet4/bmehn9naa1/x:mtm/9n/2c +

A mini-discussion of protein transport within the cell is here: https://nbmeanswers.com/exam/nbme21/742#257

+/- drdoom(1206)

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 +4  upvote downvote
submitted by therealslimshady(42)
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eWnh torispne ibegn amed in eth RE mf,ildso hyte uteacaclum in eht RE, wchih neth rgestigr tmhe ot be itsp uot otni teh solocty dna mecboe derdegad yb apeemrosso.t uh,sT eth anccamltuiuo of het idfmodles ienpotr ni teh ER is irreeudq fro htme to meytaluilt eb ggdtae yb ntbiuuiiq nda be rgeedadd ni mtroeossap.e

evEn if you ugaer thta yeht lwil be catumnigaluc in teh yotcols usebcea aetmspeosor ear ni hte ,olcsoty het oseiuqnt is gkinas reweh era the rsnioetp nalcuguitmac, otn eingb erddgaed. oS yeth 'atnc mtlauacuce in tsoapsreoe,m eeusbac they rea eotredysd ni thme.

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drdoom  nice chcat hiwt hte iactu”amg“lnuc krram!e q,q whne uyo say ertig“gsr ethm to be ipst uto tnoi eth ooly”s,ct do ouy heav a rocuse ofr t?ath t'odn raelcl nnieagrl atth rhneyewa .leysmf th!x +1
therealslimshady  I cnta' mmebreer hewer I dare sith ubt it tcuks whit ,me I htkni ti wsa a lecl bio okbo +


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submitted by mutteringly(33)
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hTsi is form s:mosab tuMatde TFRC geen ΔF8(05 inutaotm) → dlmdoisef tnoreip → cefieetdv ireptno is etaneird ni the guohr aecionlpdsm lectruuim r)R(E ofr tgrdanoeiad → agedAPT-t deorchli enclhan si sbaetn no het llce ecrsafu of tiihpaelle lsecl tuhorhtuog teh boyd ge..,( sinenlatti adn iraeotsprry i,epiatlhe satew sndlag, erieocnx cr,spaean neecroix aldsng of vuerdrceptoi sa)gonr

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submitted by unknown001(9)
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LUTAR SMLI.PE

e.erht1 rea mnya ntvairas fo ticsyc sbifiosr so this netqiosu is nto auobt pyy.pahtsh fo FC

o2ipnt. fo uqstinoe : weher deos eoirtnp nfgodli coruc ? ansewr) ERR

  1. IN SIHT PTEY FO FC , fi roientp nitso ldfdoe prrylepo in RER will ti go tuo or will it culeumtaca ? nsae)rw ti illw malccuetua ni ER.R

TPI : FI YUO PKEE CEINRAHGERS NO SVIRANTA FO ,CF YOU ARE NO A PTAH OT ENSLSED OMOD

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submitted by blah_blah(1)
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p flhlueaQmgweu;&wtitna/Nyfvwt?poaiso=m=cuw.oHaltcybsIBXleg_huao.yen/Gshnj:p3hc/b

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submitted by welpdedelp(270)
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g1C1m/3/8tn15sea?75seM.o0_h2peF4/8L0t/M/3__219cs.5i13.w299Hynb2_mvs52gTonp.ik:d2iPlgn=43r/2h2i0on/pg_se9

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