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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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submitted by vshummy(184)
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I hnikt omer rlyng,leae oetrnpi giondfl ephsnap ta teh RER nad teh emts ssay eth nieprto dt’enos olfd rpyeolpr. cpliyaSe,cfli the tsmo nmomco CF minuttoa si a odmsedilf eponirt dna eht piteonr si eertinda ni the RER adn nto ordaeprstnt to teh clel rabmeenm - AF 0129 gp 06.

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uroosisyed5  ichWh amesk eessn fi we itknh atbou het pyphhsato of eeaevldt -Cl dna aN lylcurlenralti.a Btoh of stehe soni og up isnedi het escll edu to teh erieottnn fo eht leiomdfds esoniprt ni het .RER +
lilyo  I lyuatcla sidgraee wthi hist .aosnneirg Teh ypghoohlyotpisa in CFRT si ont ued ot nlaitcmcuauo fo somdiflde .oenrstpi It is ued to ebcerde/nsadetsa TAP agdte smntaebmrrena dilCreho ane.lcnh roccgniAd to wor,Uld the sddomcie etrnpoi si edtdtcee yb the dpaEmislcon tRmeuu.lic ehT mlnraabo nptieor is aerttedg rfo tdirnecouts yb hte poraoemset adn enevr hsraeec the llec cufs.are eTrhe si ON ietrenton fo fsedldmoi r,otipne trehe is egddirnoaat fo mdslefido prionet adn refetrhoe csaneeb fo roielhdc nalehsnc on teh mbeaermn. iTsh si tahw eslda ot iadpeimr eoalmvr fo tsal omrf hte wtaes sa lwle as cderadsee NaCl ni sucmu. I tdon nhkti eht wseanr lshodu eb .RE nCa anenyo etll me fi I am imignss homenigts eher ttah skame the eranws RE as pdeoosp to sopamtylc? uBeaces het way I ese if is odlifsemd oespntir og fmor hte RE itno eth sltmpcayo to rceha hte rmsaoteoep nda etnh eb dutedtsc.re Udlowr senoiuqst DI rae ,850 ,802 5114, dan 939.1 +19
drdoom  i@ylol heT FRTC si a eemnasbarmrnt proe.tni eiLk lla espinor,t ist ialrtaonnts segbni in the oco;yslt thta sd,ia CRFT atcnsnio na -erumsiNnt asli“ng c,nsee”ueq hciwh mnsae as it si gbnei rlatnta,dse ti na(d the iebmrsoo gkaimn t)i! will be ndarttosper ot het iEndamlsocp tiuno.tRto^mleue!cfo As it sget srat,ltnead tsi ocrybpidohh oimtfs lilw mgeee,r cihwh dbmsee hte TCRF trneopi ihnwit eht ihpdpholoips aiylreb of teh ER sefl!ti htaT eanms eht rnoteip will evren aigna be oudfn “ni eth loocyt”s ueabesc ti gets teddrahe ghuothr het ilearyb hwh(ci si, in ,fcta who all mbermsneartna siterpon eoemcb nteasemarmbrn etnpisor at the clel rfuasce -- tyeh haev to be eamd niot nemabtmrerasn ernospti ni eth ER s.ir!f)t +11
drdoom  yl@oil t)i(ucdonne ,oS ye,s mlltu,aetyi tsehe seomddlfi tnpeiros lliw be icdrtede drowta a osetmarpoe rof ,geyiinodr/galnrcdctea utb atth lwil aepphn as a itellt ceeisvl r(o opiem)“”s;ol het deofmisdl n,etoirp in ihts csea, si otn lolwtbrueas-e c(ni,es yb difntioi,en it ahs pyoibcrhhdo mofits ciwhh gte h“ardeedt ”hhrguto a breliya ot treace eth ntaeaermrnmbs atpt,nre) hihwc nasem uoy on’wt dnfi it in het t.cyloos +6
drdoom  ot!efonto^ : heT ovmetemn fo vctea*i sosbroiem ofmr the yoosclt ot hte mpiaocElnds uctRuieml is ywh we clla ahtt eraa fo ER guoh“r omEidcanlsp cmtRueilu E;)”rR( no lonterec cmsopy,ocri htta noeistc was kpseebecdl htwi ltitel stdo; le,art ew )asum(hn csedoeirvd ttah tshee tdso weer irsseob!om +1
drdoom  * yB aveitc“ m,os”osreib I jtus mane iborsmose in het socrsep of itrocnengv NAmR to pnret!io ah(tW we llac aintsratnl”o“ ;) +1
wrongcareer69  Hwo amny ngamodd ayws aer ethy gogni to tste su no F.C mI' os orve !siht +2
furqanka  laso ni A,F nrdue lhpaa 1 tisn,intpyar sti sasy ldM'ofside eeng rctopdu tneipor tgrsageage ni hacaloleutpler "RE. htigm eb eth esam etcon.pc +9
joanmanuel26  iondccrAg ot pl;Kana llA eipotsnr atth era etizydssneh ni the ER tmus fold eyrctoclr ni dorre to be ntsoredpatr to the gigol aapsaurt and htne ot tiehr nflia edotinnis.ats If het muaottin ueasc a lsfomeddi e,inptor teh uerlst lwil eb hte ossl of the tnripoe oitucnfn da,n in meos cess,a lioccaauumnt of the peonrit in the R.E +1
drdoom  yli@ol hinngkiT utabo hist .rmeo oYu liwl otn dfni teh eiddm)os(fl eoinrpt in hte ytosol.c The ildmsefod eirpotn yam be idsnei a o—rnaesmpteado a mraotoseep yam liev ni teh syotltbu—co hte deidsmofl riopent ltsief lwli evner earapp ni het o.lsoyct Teh crputdso of sit enritgddaao hgimt uti(tnncsteo iomna iscda ro smlal spdpetei) but if ouy had an nidatboy ofr eht doflmdise nrtpeio dan sekad it “Wehre is het didfolmes rtnp?io”e, het dtyaionb owuld wn:aers t“Mos of tahw I dlcou dfni rapspea ot be in the .ErR” +
yesa  Ckehc uto the necalxin cy,ecl uulsyla ontpersi htta rea amde ni eht RRE dna sliodfemd gte gtagde adn eordd'f'le adn thne csnaedn ianga fro eprrpo nof.g..dlnida fi eyht yrllea tcan' eb fdl,edore ry'teeh rdedgaed hnet nda !hrete oS the lony apelc fmedlsoid TCFR duclo cteualmuca if osfieddlm sR......Ri.E ki(Ln ot leaxinnc ccel:y cbbwtp=AA.;KC_1mg81or&KaVAfiwe12=XtuiUIQkoYhmDdwnCpgV&rrs5Iaq;=E7wO6ms&cApm;c5LaOheas+tj3a:05c&=omgLhZvpvp7/branr29aD5&/ehs=HHX=Q908sr/rmU128YuiagbaeoiK;HsaDa;mxhI=eRMjm8&8e9pImQgP2lshcs+xmp;B4a7=4e.3?W=h;sZMatl0pgi#QBh&iw:lwUyUQAo4mEogUF7jeT) +
amy  F00A22 :74 " nbAtse ro tiodnucslfany RSP gnsal(i otgciiroenn pclraie)t ussrlet ni ucltuciaamon fo opeitrn ni eth oolc"sty +
drdoom  @amy, t’saht a oodg tipon tub ti eussasm eth nioertp is eihreowst n,rmlao .i,e. ont mdelsiofd ro boanla”m“r in osme eorth 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

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 +4  upvote downvote
submitted by seagull(1933)
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I aevh na usies whti thsi iusetonq ihchw saol stnfccoil iwht .doWUlr In oredr to be gadddeer by seporometos the moelidsdf pienrot louwd dene to be enprtse in eth cosytlo rof ntoanbuuii. tI it tuadluamecc in eth RRE neth how osde ti teg gdae?gt ny,loHets so tc.cidof..lne

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sajaqua1  So oarrnldyii a fdislmdeo pieront deso dongreu inanqoiubttiui adn ertil.poyoss It is ebnloeta hatt TCFR slondfgimi 'odsten veen oallw it pescae teh E,R os it autesucacml in eht ER +9


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 +4  upvote downvote
submitted by drdoom(1206)
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hTe CRFT prtonie is a rbsmaeaetmrnn t.epinro Lkie lla esinro,tp sit inttlsaonar nibegs in het looyt;cs ttha ,dasi CFTR isntcnao na reNn-tmisu ng“alsi q”se,nceue ihchw measn as it si inebg trsa,ldtaen ti nad( eht oimresbo mnakgi ti)! will be rtenpsoatdr ot hte idalnpmsEco .uucmel^itRetft!ooon

sA ti gtse ,dsrantlaet sit cyrhdbpoohi stomif llwi ,emerge whhci mebdes eht FRCT iprtnoe tniwhi het ophplpdiohsi baeryil fo eth ER s!ltfei aTth neasm teh renipto lilw evner anagi eb onfud ni“ teh tco”lsyo sabecue ti stge terddeah rhgohtu teh irealyb (cihwh is, in cf,at ohw lla esnabrmemntra teonprsi mbceoe ntbmaermeasrn poersitn ta eth lecl asferuc -- tyhe aveh to be amed onit eetarrsbnmamn nseprtio ni hte ER )s!ft.ri

,So e,ys ,yeatlutlmi hetse odmdflise inptorse ilwl be dedcietr towadr a stopoemrae rfo oceg/iiga,alcrdtenrydn tub hatt ilwl nhpape sa a tiltel ilcvees r(o s”mi)po“o;el eth dlmfoeids tropen,i ni sthi asec, is otn aou-slertewbl ,i(senc by dtiinf,ioen it sah ocyripdhhbo mtfois hcwih get h“dredaet gthur”oh a brielya ot tcreea eht snemamarntber ,rattnep) wcihh easmn uyo w’not fdin ti ni the oty.oscl


\ oeftono!t \ ehT ithgihcn of avt*eci bresmosio ot het sEmcponldia iecmtluRu is why ew allc htta aera of ER rgu“ho caoEnsplmid umeRtlciu ”();rER no reoenlct soy,opmiccr tath oesntic asw eksbdclpee twhi ilettl tod;s alrt,e we )m(hunas cdreesviod htat hetes dsot eewr risbosome!

\ * \ yB ivcea“t ”,mirossbeo I stuj eman erssibmoo ni eht peosrcs fo oeinvnrtcg mANR ot ptnoe!ir (Wtah we call inslnat”“troa );

oFr a retag elltit mmsaury fo teh isdloEnpcma itluuecRm dan( namy trhoe soptnecc ni eaoclmulr !,li)oygob see siht ofrm trl’sAbe ecrMalulo igyBloo fo het llCe:
.w1s#:/i.cto4nt.6wn8ho.w/o42n2/mpKhb/2AilvsbkB/g0N

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drdoom  ^ 'Im sjut etrgs-iatn in one moemctn twah I rwoet in tipellmu netubcmsosm be:avo tne93atx/m:b1.4osemm3//ma#nw7c9r/e/hs92nepsb +

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

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submitted by therealslimshady(42)
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enhW nstorepi ibnge dmae in eth RE l,omsidf tyeh aumecutalc in teh R,E ihwhc ehtn sirreggt etmh to eb ipst otu noit eth ltsooyc dan mbceoe edgedrda yb .rsaotpoesme huT,s the noaautluccim of the folddmesi otpnier in eht ER si diruereq rfo tehm ot tutalyimle eb dgegat yb bqiutuiin nda eb egrdeadd ni .omospetares

nEev fi uyo graue ahtt hyet lilw eb auualtmncgic ni the ocylost ucbeaes rposseoaemt era ni the ,ctyolos hte uneistoq si kiangs ewhre rea the pnroseit tcigaculanum, not neibg ddaegdre. oS yteh atnc' aleacutcum in esapsroo,etm eescuab yhet era osdrdytee in .hetm

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drdoom  ienc htcca hitw eht ”amiltuc“nucag r!aerkm ,qq ehnw uoy ays sreig“rgt meht to eb istp tou toin the t,ycoos”l od uyo veah a secour for htat? nto'd eacllr gilrnane htat eheawrny yl.esfm thx! +1
therealslimshady  I cat'n rmbemree ehrwe I adre isht but it ksctu htiw em, I kthin it wsa a lelc boi kboo +


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submitted by mutteringly(34)
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siTh si rfmo smbao:s tMeuatd RTCF gnee 8Δ50(F uttn)ioam → dfmsoeild eornpti → detevcife rtpenoi si earetdni in eht hguor aedomcpinls ecluimrut rE)(R orf ndiaaeotgdr → -aAgdteTP lierhocd necnahl is btanes on the clle rsfecau fo eelthlpiia eslcl thguorutho het bdoy ge,(.. nlsnitatie nda paoritserry lteapeii,h esawt l,adsgn exreinco ,psrcnaea crixeneo ndagsl fo treredicouvp saro)ng

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submitted by unknown001(9)
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LAURT SIPMEL.

1reh.te era mnay isanartv fo tyicsc boisrisf os sith qstniueo is not autob a.thypyphs fo CF

p2.toni of qoenstiu : hewer eosd rieoptn lndgfio ucrco ? )srwane RER

  1. IN TSHI PYTE FO CF , fi nertoip isotn ldoefd rreloypp in RRE lwli ti og uot ro lilw it aeuacmtulc ? nw)aser ti lliw cucelautam in R.ER

TPI : FI YOU EEKP HSEIRECARNG ON AVINTRAS OF F,C YOU REA ON A THAP TO SSELNDE MOOD

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submitted by blah_blah(1)
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pfehull nsl?ya==hobwpIw_/njvt.gyt/npiu;aNw:cubhetweioBGetaHg.chuoa3af/&lysmQscXmo

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submitted by welpdedelp(270)
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0i3o8m_.yi29o4/.ke2032eswn52i=n1ns597t0M_22Pahg3sLC__mh2p/1Tln:g.Hs.ves?pi29dt/pg1n/19/1g38/Fo5re54_bM/c

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