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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 ikhnt mreo ,ynelrelag inptroe ofngild panheps ta het RER adn teh tsme syas the ionptre es’dtno lofd lrpoeryp. ccepl,liaSiyf hte otms comnmo FC umtatnoi si a omdesdfli renotpi and het itprone is rnedteai ni eth RRE nad tno nottsrprdea ot the lelc reamebmn - AF 1920 gp 60.

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uroosisyed5  Wcihh kaems nssee fi we iktnh tboau the sphtophya fo tveedael -Cl adn aN ulllatlynaeicr.r oBht fo eseth onsi go pu nisedi het elslc ued ot het reitotnne of hte femlsddio rpeisotn in eht R.RE +
lilyo  I ayautcll irgaesde ithw shit isnrgn.eoa eTh lppathysihyogoo in TFRC si ont eud to uuciamloctan fo disemfodl oeit.psrn tI is deu ot dredes/enbaestac APT gdeta menrbtaasemrn delrCioh e.lnahcn onAdrcigc ot wdrlUo, the oscmeddi ptrione is tteecedd by the paEcmosdlni tuicleu.mR The amaorbln openitr is retatgde fro nttrcsuiedo by teh toomerpeas nad eevnr haecers teh lcle ferucas. hrTee is ON eirntteno of sfemilodd nt,eproi etehr is dnraagoteid fo iedslmfdo oietprn dan hreoetefr abeencs of dilcoehr neaschnl no teh me.bmnrae ihTs is hatw aedsl ot iirdpema olmrvae of tsla ormf the atwes as wlel as dedcrseea lCaN in u.smcu I dnto tnkih eth erswna sloduh eb .ER Can aonyen llet em if I ma isgsinm ngitmohse ehre taht kasme the rswena ER as posodpe to mtyps?laco acseeuB teh wya I ees if is dodfseilm rntsepoi og rfom teh RE ntio eth ocalstpym to haecr het oaroeempts adn hent be st.edrtdcue rUlodw sqisotune ID era 8,50 82,0 5141, nda 3991. +19
drdoom  lly@oi heT RTCF is a rmnnmaaresetb tr.poine eiLk all tiespnor, sti tasnirnaotl sngieb ni hte ;ltycoos atht asd,i CRFT ntnaoics na rsNtmune-i g“nlsia ,qeecse”un hchwi aensm as it is iegbn ,arnettasdl it adn( hte mboeoisr ganikm it!) lwli eb rnesttrpado to eht odimlpaEnsc nult!fumcte.Roio^eot sA it gset e,arltanstd sit dobhhypciro otisfm lliw egem,re hiwhc esebdm teh FTRC ioetprn intihw teh hppldpoihois bryiela fo eth RE felsti! tahT names the noripet ilwl nevre angai eb odnfu ni“ hte olst”yco beaseuc ti sgte teardedh rgtohhu the ylairbe hicw(h is, ni ,catf woh lla smntreeanbrma ieoprstn oeecmb rmnetabaemrsn rpnietso ta hte lcel casfeur -- tehy ahev to be dmea noti ennmerambtasr serntiop ni teh ER t.)sf!ri +11
drdoom  o@liyl nn()oiudtec oS, yes, l,eiamlutty ehtse sldimfeod rtoipens lilw be dedercti adtrow a meprtoasoe fro /gynndrtgiodlir,eaaecc utb that lwli pnhape sa a tetlli livcsee o(r ”mie“oslo)p; eth solfedimd oreitpn, in isth ae,cs si nto llutserboawe- ise(,nc by oiedn,ntifi it ash rchdiopyohb fmoits wchih teg htded“are h”rhtoug a relbyai to eercta eht emaaetsrmrnnb rap)et,tn hhicw neams ouy no’wt dinf it ni teh oc.olyts +6
drdoom  o^et!ofnot : Teh mntovmee of v*cteia oomissbre fmro hte sytocol to hte pismlcEnaod uutRcimle is wyh ew alcl that aear of ER “hugor mnoaEsclidp iceRtmulu );rE”R( no trencole ,oycpoimrcs htat tseonci asw plekcbdese htwi eltitl tdo;s tal,re we mhu(s)na ivoscdrdee atht sehte sotd were irm!obeoss +1
drdoom  * yB atec“iv ”rmiob,eoss I tjsu eman ribomseso in teh rscpseo of vencnirgto RmAN ot trnop!ie (Wtah ew call atlot“”anrnsi ; ) +1
wrongcareer69  owH yman ngdodma awsy are yteh iogng ot ttes us no CF. m'I so vreo si!th +2
furqanka  aosl in FA, ndeur lahpa 1 aytstiniprn, sti ssay ddoM'fiesl egen udortcp tpoenir easeragggt in eparuhtelalocl ".RE thigm be teh smae otpn.cec +9
joanmanuel26  coAgnicrd to naaKp;l lAl sniperot that are tehsszydein ni eht RE mtus dfol yctrerloc in erdro to be rpnttaoreds to eht ggloi tapraaus nad hten to rthie nalif .osasintnetdi If eth mniautot cuase a esolfdidm ,otpirne the terlus illw be teh loss fo eth nteiorp cnutniof dan, in osem c,asse acicuauntolm of hte ietprno in teh RE. +1
drdoom  y@ioll hinignTk ubota itsh roem. ouY wlil nto ifdn eth sdi()domefl iorpten ni hte otco.syl Teh mddsoifle rotinpe amy be iineds a mnepotoadsr—ae a trmesooeap amy veil in het —cttbyouslo hte idmesldof ietnorp felsit will veenr repapa ni teh c.otysol eTh utdcposr of sti dedraoingta ihgmt (nueittnstoc omnai acisd ro allsm )iptpseed tub fi yuo dha na abiyotnd orf the emsiddlfo nioprte dna kedsa ti “eWher si eth sdmdeilfo nt?op,e”ri eht ydboinat wuldo ew:rans s“Mto of whta I oludc difn prpaesa ot be ni teh Rr.E” +
yesa  Cckhe tou the axecilnn l,ceyc asululy spnetori hatt rea dame in hte ERR nda ifdmdlseo tge gatdge nda 'l'ddoefer and tenh anedncs naiga fro erporp .d.flgind.noa if hety ayllre tc'an be orde,ldef re'heyt dadegedr nhet nad hetre! oS eth yoln caepl ifeddmlso CFRT oucld cteaulcmua fi leimfdosd s..i....E.RR Link( ot annliecx yeclc: clh8aAZwHsir=Q31=&1EKalqcra8mip5e5oDm=s;Amg;eHcpEnhKMsdtVe78Daw97Otjs3eap&IhIj+aroAxTUQb9rIbF&hjQ#c6mthOYPy5;v8ma:5/U&gis=2i2x1gn.CAw7&f+I7W_gwkUXosab=vpCD;QplesZmXiKe;HQia1Yhum2wp9aBV=rcpR4=0?;&e&=/0mu2s4t0a:mpemroAaow4gBgbmog/LaMr=sh;h8.LUU) +
amy  2F02A0 :74 " stnebA ro sytfnuadoinlc PRS ngasi(l tononercgii realtp)ci estlrsu in inuacoamtlcu fo inoretp ni het oyso"ctl +
drdoom  @ay,m tha’ts a oodg onpti tub ti samesus eht tinrpoe is eseihorwt lonarm, e.i., ont idodfeslm ro bm”“roanal ni emso eohtr wya +

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 heva an usesi whit tshi onetuisq ichhw laos slfcinotc iwth U.lWrod In drore ot be radgeedd by ospoeremtso hte dlimdfose iopnrte woldu eend ot be srtepen in hte oysloct rof iuoaunibt.n It ti edtaclmucua in eth RRE thne how sedo ti teg g?eagtd Hystloen, os n.e.ido.ccftl

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sajaqua1  So iiroryland a fdiesoldm eipntor eosd nrogude naioitnqiuuitb nad o.elyiporsts It is talonebe ttha TFCR mnsfiiogdl 'ostedn neve wolla ti pceaes eht E,R os it eclaucumtsa ni teh RE +9


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 +4  upvote downvote
submitted by drdoom(1206)
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eTh RTCF irpoten is a nmnmsrerbaeta nepi.tor iLek all n,reopsit its rnttoasnial esnbig ni eht slyooc;t tath ,isad FCTR nnasicot na mtenN-irus lg“ansi ee,qn”csue hcwih means as it si gineb ats,alrndet it dna( het eiobsmro nkagim t)i! ilwl be nrsartetodp ot eht adiEsclnpom eltu.mui^Rceonoo!ftt

sA it stge aar,tsdnlte sti orhpidyhboc mtfois illw mgeree, ihcwh ebdmse the FCTR optnire inwiht eth psplpdhiohoi ayibrle fo the ER ifstl!e aTht naems eht ipentro lliw rveen niaga be fnuod in“ the ytsoloc” beuasce it estg dtederah uhhgtro teh byleair ihh(cw ,si ni a,ctf owh lla ramrtaenmsbne psintoer mebeoc sbenmnermarat sntoerpi at the ellc fascure -- tyhe evah to be maed otni mraeanrstenbm pritonse in hte RE sr!fit).

So, sye, iutlayemtl, etseh dfoimleds nesritpo lwli be reidtcde owatrd a seeratmpoo rfo cyedidgalaicngotre,n/r tub taht wlli neaphp sa a litelt vcliese (ro opm”“se);lio het idefdsmlo iorn,tep ni sthi se,ca si ton aete-rluobwls esnc,i( by eniifon,idt ti ahs pcoobdrhyih imotsf chihw egt “ardtdehe rgoh”thu a ibayelr ot craete hte rnatbmmenresa pant)rte, iwchh nasem you tnwo’ dnfi ti in eht oct.osyl


\ onottf!oe \ heT ihhgtcin fo vt*icea moiebssro to eth pniaosEmlcd iRlumteuc is yhw ew llca atth raea of RE horg“u oacsilnmpdE tlucmeRiu R”);r(E no enetcrol coopmric,ys tath ientcos was ecpedsbkle twhi eilttl t;dos etral, we hn(mas)u devcdories atth heets stdo wree sooeibm!sr

\ * \ yB teaciv“ smsrioo,be” I tjsu aemn ssiorobme in het osrescp fo intrvconeg RNAm to r!otpnie hWat( ew lcla ral“nso”iattn ;)

Fro a agter elttli aymusmr fo eth sEplinamdco clRiumtue nda( ynma thoer cetcpsno ni rumelaclo ,oolbi)y!g ees hsit ofmr ltAr’bse oeurlMcla golioyB fo teh lCel:
16bh./hbwsnwi8:/po4.tc/20kB/#4/snAo.m.nKNlvto2g2iw

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drdoom  ^ mI' tsju rt-nseiagt ni neo meotcnm tawh I orwte in tmelupli usetobcsmnm veoba: 9/pams23o.en3bs/st/me#we:9m9/7/ebchrtaxnn4m1 +

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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Whne oetpnsri nebig dmae ni het ER f,doilms htye mtauucaecl ni eth ,ER wcihh tnhe trgeirsg htem to be tpsi uto oitn het ylosotc nad meoecb dadgdree by msa.ersetpoo ,uhsT the tnlocmciauau fo teh misldodfe pioetrn ni eth ER si reedirqu for htem to lmaitytuel be dteagg by uubitnqii nad eb rgddeade ni roesoe.tsmap

vEne fi ouy raegu ttha ythe wlil be anlgcmacuitu in eht slcotyo besaecu aoperomstes ear in eht tclos,yo eht osqntiue si ignaks hwere rea the iopstrne iaanccuutlmg, tno ingbe gadredde. oS hety acn't alceutmauc in m,sasoterpoe easucbe thye ear dsyeroted in emt.h

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drdoom  ecin hctca twih het ct“nciuaualg”m k!emrra q,q enwh yuo yas gisre“trg mthe ot be itps otu otni hte oosc,”ylt do uyo evah a ouersc rfo at?ht t'odn lclera aenglnir ahtt enyrehwa .esflmy xht! +1
therealslimshady  I c'ant eeemmrbr weehr I erda shti tbu it csutk thiw m,e I khitn it was a ecll oib oobk +


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submitted by mutteringly(33)
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sTih si fmor :sobmas atedtuM TCFR nege 580(FΔ i)ttaounm → mefldsoid pirento → ieetfdvec oinrtep is eineatdr in teh oghur peidsclaonm mruucetil R)r(E fro aonrgeidtad → gPTta-edA orhecdli lenahcn is esbatn no eth llce rsceafu fo ehtpaieill eslcl uuhtoghrot eth yodb ..(,ge nntsliaite nad rprytiosrae letiapei,h tseaw ,sldnag irnoeecx esacan,pr oeirxecn adgsnl of utcdeiroprve sog)nar

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submitted by unknown001(9)
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TLRAU EIMPLS.

rhe.te1 ear many tiarasvn of cycsti issobirf os this tsqioeun is ont autbo hypa.ysthp fo FC

2npio.t fo iutqseno : heerw dose ptneroi lgindof corcu ? wa)senr ERR

  1. IN ITSH TPYE OF CF , if eirptno stnio edfdlo pprryole in RER lwil ti go uot ro wlil it umualcteac ? raw)nse it wlli caeualcutm in ER.R

ITP : FI OYU EKPE GNRSAHREICE ON TNASVRIA OF ,CF OUY AER NO A PHAT OT SSLNEED OODM

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submitted by blah_blah(1)
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lfp eulhosyXufa;pcIhlwmNeweBcn:os&aeHosl=nuc?jt/aa/pmwhgitwha3.vQugttbGin.b_yo/=y

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submitted by welpdedelp(270)
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.on_5pP..isgi/21g?0hM7st.23d/22vh42n1ogssoL/g1ien11ee4_=2nt2p/ysC0im_3Tk5ba3c_9F_5lpw0M/8rn99/8m:3H59/2e

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