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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 htkin omer ,lnlegyear etnpiro igofnld shppane at the RER dna het emst assy het nrtopie ’dnoest fold rrppyole. aipllfc,yeicS hte sotm comonm CF auinttmo is a sfddlioem tnoripe adn the orepint si eaderitn in teh RER dan ton drrstpontae to the lcle bmneamer - FA 9102 gp 6.0

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uroosisyed5  Whihc ksema snees if we kihnt auotb hte ytphshopa of deleeatv Cl- dna aN lacayue.trlnlirl htBo of seeht osni go pu nsiedi teh sellc ude ot het enneitrot of hte fsmeiddol pensrito in hte RRE. +
lilyo  I ulcaylta gisdeare tihw isht ineogarns. ehT iopholhypgtysao ni CFTR is otn deu ot camcutinoual fo dsdlomeif oit.ernps tI is edu ot /sdeaetdbnsreace TPA aetdg atnnmrrbamsee roChdeil n.lachen ccrnigAdo to l,rowdU the deimscdo pinoret is cettddee yb het opamcsdlEni muiRec.ltu heT aoarbnlm ornpite is artegdet rfo oesiudcntrt by het oreemposat dna venre rhaesec hte clle .arceufs Teehr is NO nnteioret fo smoldfied neriot,p ethre is eirdataodgn fo dsmdliofe poientr adn eforehrte anseecb fo hlorecid elnhsacn no teh emnrbae.m Tish is twha adsel to midiraep lvoaerm fo stla mfro het ewsta sa elwl as rsedeaecd aNCl in uucs.m I ontd ntikh eht nrsewa olsudh be RE. nCa noaeny tlel em fi I am insigsm otshnmgei eher ttah easkm het enswar RE as opespdo ot ymptlscoa? scaBeeu the yaw I ese if si iedfmdols neopitrs go frmo teh ER tion eth pacyoltms ot hreac eht ameoresopt nad hetn eb sec.urtddte lUwdro enqoistsu DI are ,850 820, 54,11 nda 9319. +19
drdoom  @ioyll heT RFCT si a eamanntsrmrbe .prieotn keLi all pro,stine its ltnistanrao gbsnei in hte col;ysto thta dias, TFRC csaninot an rtu-isnmeN snl“iga usene”q,ec hchiw samen sa ti is ibnge rt,atleadns ti d(an het oiomersb nmkaig )t!i liwl be aptsetrdonr ot hte iocnEladpsm li!cRu.ntotte^fmeuoo sA it gset sdtatrnea,l ist pocrobhyihd fmiost ilwl rgm,eee hciwh mdsbee hte CRTF irnpote htiwin teh poopishphlid abyreil of het ER tlsfi!e thaT ansem hte otnerip iwll vrnee inaga be nufdo ni“ het ”tcolsoy baueecs ti estg eraehtdd rgouthh het leibrya hw(ich si, ni ,catf how lla terrnnasbmeam eiptsnro mobece ebtmmnreansra optseirn at the ellc cuerafs -- tyhe haev to be dmae tino terenmnabmasr tnioesrp in teh ER tirs.!)f +11
drdoom  io@lly o)ntencudi( ,So ,esy tiullm,ayet eesth ldeomifds oepstrni llwi eb crdeidet wdtrao a otseoamrep ofr anediy,cegrnilcorga/td tbu atht iwll hpepan as a iettll leeivsc r(o l;s“”pioo)em eth mddlfoies r,eotpni in ihts sac,e si ton lloaretewsb-u ,e(icsn yb ioeifd,ntin ti ahs opoichhrbdy tismof whihc etg rteahde“d ”ugothrh a erbyial ot retace het bermmensranat tn)etrap, ihhwc esamn ouy wton’ dnif it ni hte lcyoot.s +6
drdoom  f^o!ntoeot : heT tmeemvno fo ic*vate bomsisreo form the loocyst ot the nacdospEiml clmeuiuRt si ywh ew acll ahtt eraa fo RE “rguoh lcpoiasmndE ltemiucRu (E;”R)r no nectlroe icoc,spmyor that insetoc saw debckplese hiwt itletl o;tsd re,lat we mhu(asn) vdisoercde ttha ehets sdot erew oseo!rbmsi +1
drdoom  * By ace“itv rbieo”s,mso I usjt mean bmeorssoi in het repossc of nnitegorvc NARm ot eritn!po ahWt( we lalc sntrtn“aaio”l ) ; +1
wrongcareer69  Hwo amyn agoddmn wysa rea thye niogg ot tset su on CF. mI' os reov ith!s +2
furqanka  losa in F,A endur palah 1 pnnt,tsairiy ist assy fed'lsoMid geen crodtpu nperito sgaatggere ni elaulacltoephr E".R tihmg eb het mase npeco.ct +9
joanmanuel26  odAcnicgr to pK;naal All rneiotsp hatt are yheetzisnds ni teh ER umts oldf tlceroycr in erodr ot be nropasrtdet ot the gogil aatsrpau and ehtn ot tiher iflna i.nssntotdiea If eth taioumtn sauce a fldoseimd tnproie, hte serult wlli be hte lsso fo het rtoinep cfuotinn ,and ni meso ,essac autcmicanluo of eth npeoitr in eth E.R +1
drdoom  li@loy ignThink tboua tihs er.mo You wlil nto nfdi the f()isdodeml ienrotp ni teh o.yscotl hTe dmloiefsd ienoprt mya be iisden a pesnoed—omrtaa a omeposaetr may lvei in the —tcsylboout teh fiddemlos eotrnpi efltis will veern paearp in het oyo.lcst The tusordcp of sit daaridotgne tmhgi sitecntn(uto ianmo sdcia or mllas pde)estip but fi ouy hda na boiyatdn rfo the iodsedmfl niroetp and saedk it eh“reW is the ddoesimlf p?noie,”tr hte naidyobt uowld aserw:n sMo“t fo atwh I oulcd dinf arepaps to be ni the R.”rE +
yesa  ecChk tou the aeiclnnx ,ceylc yauulls itporsen taht are emda ni teh RER and deofidmls tge dgtaeg dan dler'd'eof dna then scnndea nigaa ofr prrepo ann.dfldo.gi. if thye larley at'cn be ol,refded hyer'et dgdeeard tnhe nad er!the So teh onyl paecl idefdmslo CRFT loucd uuaacmletc fi dfimelsod ..s.i.RE..R. (iknL ot einxnlac :leycc a&/1wgx&=IU7nha8sg2F;ciiAgyKpQCclOm64as3dj&Xn38+rHrom?4Eaw/=8QbID/5+cr2XwT7mQoeseIi5lAoKhVhaoQ=:=&iepmps0camIYa&ogisbA&7UkAU9e5Bpu#wgDgr=vEmV;QRZBv5a;mqm=tp:b08c1PrDmhj9sL;Y90=amo7tU8pphe;af..;jOr&4AUxZ;hhwMsasCtHa=ulee=mLaswr_Hp2K1WM1tg2hebi) +
amy  F0A202 :47 " nesAbt or lafnsoutycidn RSP agln(si grinetcioon )plarceti tselrus ni clocaimutnua fo tnoiper ni eht yltcsoo" +
drdoom  ,yam@ ash’tt a gdoo ptoin ubt it sseusam the terionp is rotewsihe nao,mlr e,..i otn esifdomld ro “”malbnora ni mseo rhteo awy +

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)


 +4  upvote downvote
submitted by seagull(1933)
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I haev na siesu ihwt siht uqenosti hcihw olsa ftlccsnio iwht .olrWdU In order ot eb edgdedar yb oepsoertsmo the dmlosfeid ienorpt owuld nede to be esrentp in hte ctyolos rof uon.taiunib It ti ltdcuuameca ni eth RRE nhte who dseo ti get ggdeat? ostle,nHy so d.ce.n.tlfoic

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sajaqua1  So raynoiirdl a fdseimodl pteiorn seod druonge qoiuattnniuibi adn tolipsoesr.y tI is ebloenat ahtt FRCT iomsfngdil netsdo' evne ollaw it aecspe eht ER, so it ltccamsauue ni the ER +9



 +4  upvote downvote
submitted by drdoom(1206)
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Teh TRFC reiotpn si a nbramesentarm itn.poer kieL lla ireoptn,s tsi aninrlottas bngsei in eth sol;toyc htat sd,ai RTCF nscanoit an suen-itrmN anlgi“s ee”eucq,ns hhiwc asnem sa it si bneig dt,anaetlrs it n(da eht oimebosr inkmag i)t! lwli eb dtoernsprat to teh mpsocdlniEa lmueRit^.uceftotono!

sA it steg rneasltd,at tsi ihhbrpdoyoc oimfst liwl g,ereme chhiw bsdeem teh CFRT optrein tihnwi het iodilhspphop ableyri of the RE l!eifts Ttah eamsn eht noeiprt lwli vrene gaina be nduof ni“ eht ”sltooyc eeaucsb ti esgt dadteerh gtourhh het yealrib ihhcw( si, ni t,afc hwo lla nerrnbeamasmt tsroniep eboecm emmrbnanraest inoerpts at the llec afreusc -- tyeh vhea ot eb dame tnoi nastrmmnrbeae rtnpeiso in teh ER stf)r.i!

o,S ,yse ,tlaiymeutl seeht fdmslideo noriptes llwi be trddicee odwtar a opmsoerate rof gileagrcina/nrotddye,c utb hatt illw paphne sa a tleitl eeisvlc ro( mis“”)el;oop eht mflosddei pniero,t in siht cas,e is not aswrleel-obtu e,(csin yb idiftenino, ti sah dbihopohcyr mfotsi ihhcw teg hdereadt“ grhth”ou a raleiyb ot etaerc hte rnmmnaesbaert nt)are,tp chwih menas uyo tw’on fidn it ni the yolocst.


\ !fnootoet \ The iicgthhn of e*iacvt somebsior ot teh linapmsEocd iuuemtcRl is ywh we clal atth aaer of ER hg“rou siopndlEamc eultmuRic ”(Rr;E) no eeolrnct ,simcporoyc hatt enstoci aws ebepslekcd hitw ettlli odst; aelr,t ew sahu)(mn evdoeidrsc tath shtee odst erew !ssbmoireo

\ * \ By veatci“ eobmosis,”r I tjus mnea bomieorss in the scsoper fo ngovcirent mNAR to on!retip tWa(h ew call ”lstnrtianoa“ );

For a etagr llitet masruym of eht moadlpEscin Rtumuceli (adn aynm eotrh cnotepcs ni cuaerollm libo,oy)g! see shti mfro r’stebAl lrMuoceal oogBliy of eht Cell:
n8s:ok.h/inpwK/hi4.b2v/ng.mt/wc42wBbN/.26lo0Ao#1ts

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drdoom  ^ mI' tjsu nia-grtest in one emncotm htwa I treow ni letilump uocbessmtnm vba:eo r//#te349esaem32s/9msh1nowexptbma:.7/cnmn9b/ +

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

+/- drdoom(1206)


 +4  upvote downvote
submitted by therealslimshady(42)
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When stirepon begin mdae ni het ER idflm,so htye lmcecutaua ni teh ,ER wchih etnh retgsigr meht ot be tsip out otni hte ctsyool dan mbeoec ddaeedgr yb espmeot.rsao T,hsu het ctamcolnaiuu of eth iedfdslmo orptnie in hte RE is qduierer for htem to aeiymultlt be gtadge yb biiutqniu and be eagrddde in rmes.oeptaso

enEv fi you rgeau atth eyth lliw eb cagcmualntui in teh olycsot cabeues tooaempsres aer in eht ,ytocsol eht qontsiue si ngsaki where rea the stporine acluunmtigac, ton enbig dgrdedae. So hety ntca' acaumeutcl ni pm,oesrtaseo esceabu hety rae etdsyorde in tmhe.

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drdoom  niec tchac hiwt het “aacumlgiu”ntc amerr!k ,qq hwen uyo say tgr“eisrg tmhe ot eb tisp tou oitn the ylto”c,so do uoy hvae a soceru rfo th?ta d'ont lercla ginlanre thta arenyewh sel.fym !xht +1
therealslimshady  I tn'ac mbrereme ewhre I reda thsi tub ti stcuk hiwt m,e I kntih it aws a llec iob bkoo +



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submitted by mutteringly(33)
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iTsh si mfor soasmb: tdtMaue CTFR enge (5Δ8F0 mt)auinot → dlsdmifoe eiptnro → iefeevdtc toienrp is eetdrani ni the guroh sceplnamoid tulemuirc )r(ER for eatgaodindr → TtPd-eaAg drioelch calhenn is tensab no eth ecll fraceus fo ileahtelpi llcse turohhutog eth body ..,(ge nttlnieais nda irytrroaspe paielhtei, wetas gl,asdn ixoeernc ,aacprnes eexoncri naglds fo uodevirpecrt sngo)ra

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 +0  upvote downvote
submitted by unknown001(9)
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AUTLR PMSILE.

.erh1te aer yanm naraisvt of ictcsy iifosbsr os sthi tnqousei si not tuabo .hyyspthap fo CF

tnpio.2 fo qonutsie : werhe dose itepnor ionfgld ouccr ? e)awsrn RRE

  1. NI HSIT PETY FO FC , fi otnrpie nisot fdlode prleyrpo ni RER will it go uot ro ilwl ti eaaulctmcu ? asewnr) it ilwl autclemcau ni ER.R

TIP : IF OYU EPEK ANGEIRHCRES ON SIARVATN FO ,FC OUY ERA ON A APTH TO NDESSEL OOMD

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submitted by blah_blah(1)
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fpellu hc;a/uynb.loah:IpytQeGn=joop=cwwm&t.mah?evBfNhbyu/go_HiwecsisatXg/unsw3lta

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submitted by welpdedelp(270)
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?21_:.p/ppne2n35_2b3mi_s5Co/9/sl1rM_T0_L9nh0M1/12hFn.Pt53aHmei1e/ygg0/4d/837og5sks.cn4822sie9=9.vgio22wt

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