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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 itnkh rome e,rnaeyllg otpinre lngidof nspphae at eht RRE adn het mtes sysa eth noerpit setod’n oldf .rrolppey cl,lcSypafiie hte msto mcnomo FC taoutmin is a disemflod rtnoeip nda hte tonepir is tareeidn ni the RRE and otn otnrpdrseat to eth lcel mnrmeaeb - FA 1209 pg 6.0

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uroosisyed5  cWhih eskam snsee if we hknti utoba the oysppthha of eedeatvl l-C dan aN rlullnictayalr.e oBht of teesh iosn og up siidne eth sllec ued ot the oneerttni fo the sielmddfo estonirp ni the RE.R +
lilyo  I cyltaula rdiseega whti htis ennaoigs.r ehT ohgylioopsphtya ni CRFT is tno eud to tcuocamnuail of imlofesdd .irnoestp tI si due to end/eeestadacsrb TAP agdte amanresnrtemb deohrCli lenacnh. rcignAdco to olrwU,d eht idsmdeoc otrnpie si eetectdd by eth aomdEnlpsci m.celiRutu Teh oalnmbar otniper si drgtaete fro ocsnedirutt yb hte oapmeesotr and rneev eaercsh eth llce uecs.far eTher is ON ntirotnee of mledsidof nprie,ot ethre si atorgedidna of dlisdefmo ienrpto adn fhrtoeeer cbaesne fo hicerold nenlscha on het reman.ebm sihT is awht aelsd ot amirpied lamreov fo ltsa mfor the aetws as lwel as seedrcdea NCal ni cumsu. I dont tihnk teh sreanw uolhsd be R.E Can eoanyn llte em fi I am issming tgsmehino heer tath seamk eth nrsewa RE sa soppeod to cam?plysto aBeeucs hte awy I see fi si dsomilfde seprtino go ofmr eht ER ntoi teh sycaptoml to craeh hte smraeetoop dan tnhe eb dtuedtrs.ec wdUolr toqssunie ID are 805, 82,0 511,4 nda .9139 +19
drdoom  o@ilyl ehT TFRC is a eretnmmranabs irentp.o Leik lal tspie,nro ist ittnlonaasr gisneb ni teh cosytl;o ahtt ,sadi CTRF ntscaoin na Nmsnrui-et anis“gl c,seeuqen” cihwh asmne as ti si ienbg ,talnetrsda ti nad( teh oorebmsi agnkim ti!) liwl be pasdtrtonre ot eht lmEdponacis tmce.oooiut!unRl^tef sA it sget dls,nataert tsi hdicbhrooyp fimtos illw m,eereg chwih meebsd the RCFT porenit hnwiti eht psiiohppohdl ribylae fo teh ER ise!tlf thaT easnm het rinopte wlli reven gniaa be fdnou in“ eth loy”tsco ceeasub ti etgs etedhrad ohuhrgt het ibelayr hw(ihc s,i ni tafc, who all rtenaabrsnemm esnorpti mboece emsmaaentrnbr isrpoetn ta eht clle resuacf -- hety heav to be edma oint tnmrmbesaearn rnitspoe in teh RE t!f)i.sr +11
drdoom  @loyli )udtcnieo(n ,So yse, ltmut,lieya shete dsfedmloi otnrpeis will be eicdetrd tdwaro a tempoaerso orf digor/yladg,treinnacce utb ttha lwli eppahn as a etllit leseivc o(r p;“”ooesil)m hte disloefmd i,nptero in sthi c,esa is ton -serbwolualte eisn(c, yb idnifteoi,n it ash piohrdhyobc isftmo hiwch egt “ratdhdee ”rhugtoh a rilbyea ot teraec het senarmtnmaebr )etrntp,a chiwh aesmn oyu ow’tn idfn ti ni het osyc.otl +6
drdoom  neofot!^to : ehT mvotenme fo evti*ca moiesbosr mfor het yclosto ot eht amdlcsinEop ucimReult is hwy ew lacl htta aaer of RE urgho“ nmisdpolcEa cuetmliuR ”;E()rR no crenleto poroc,yiscm hatt ioscnte aws skleeecdbp thwi llteti ;tsdo lae,tr ew nua)(hsm rsdedeciov taht hetes sotd erew !rsiosmbeo +1
drdoom  * yB “aeicvt os,eb”ormis I ujst mnae oesrmobsi in the pseorsc of ergotinnvc mRNA to tpneoi!r (hWta ew clla “lstnariat”on ;) +1
wrongcareer69  woH mnya andomdg awsy are eyth ongig to etts su no .CF m'I so vroe ti!sh +2
furqanka  aols in FA, urden hpala 1 ntripnsait,y tis asys ods'idMlef eegn rodtpcu optreni taesgagreg ni palcaelhuretlo ."ER mgith be eth same cnpotce. +9
joanmanuel26  ircAcdong ot K;alpan lAl inreostp ttha era syeisdntzhe in eht RE smtu lfdo ectrcylor ni eordr to eb rdsapnretot ot teh giolg rasupata dan hten to rihet anlif asii.ottnsnde fI het tonumait ecaus a fseodimld tpnroie, teh tusrel llwi be eth ssol fo het pteoirn ninfouct adn, in omse ,secsa tcualauocmin of the rpionet in teh RE. +1
drdoom  @ylilo gkinihnT utboa sith oemr. ouY will ton find the fmdedso(l)i enipotr in eht otoscly. eTh fislmdode pnoreit yma eb sndeii a reosotma—nedpa a rpasoeomet may live ni the osbyotucl—t the oedslimfd rnpioet iflest illw nevre parepa in het tls.ooyc heT stoducpr of sti ragandtodei tghim cst(ionetutn oinma csiad ro samll ppd)tesie btu fi uoy hda an otbyndia ofr teh idodmslef etiponr dan eadsk ti ree“Wh si hte esmdodlfi rnt,ip”o?e eht obidanyt woudl nwar:se tM“so of atwh I lucod indf apsapre ot be in eht rR.E” +
yesa  Chcke out eth cixnaenl y,celc ulluays posirnet htat rae emad in eht ERR dna iomddelsf tge ggeatd and rdo''edlef dan ehtn esndanc agina orf reprop .fiondd..ganl if ehyt ayrlel t'anc eb of,dldree 'rtehey ddgeerda hnet dna r!thee So eth only aelpc sefdodiml FRTC cdulo ucmltueaca if sidfdloem ..iRsR.E.... kLni( ot cxneinla yec:lc rMQ/hjmQer8wioUpnm&cH_tB7;hfs#=&tmsbFhHgBxrsRaPwQAabiglU&pmDMaa==.3eH2ap08mo=l;54LaUYUgAA8lQ;jweb5dZ;K6.otKZhaa8Y2nah;=vsAeKcpsrwo90sruior;sehpms=I=CgObm2h9yC7iamxa5eIwUm1sVp&itVEae5D&1acOh/r?oIk1gem:+I:=&1pgLg+Epi;XjWm7q=u4XQ&9Twvc87D/0234cA) +
amy  20F0A2 47: " stbAen or suydoafclintn PSR a(sgiln rntiicnooeg careti)lp ustlrse ni iacuctumnlao of topreni ni teh soyl"cot +
drdoom  @,mya shatt’ a gdoo niotp but ti musssea the irotnep is triweesoh rn,oalm e,..i not leoimfsdd ro b”“rmnaalo in eoms ehtro yaw +

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 eavh an sisue hitw stih nueitosq hhwci laso lctsiocfn wthi ldUorW. nI doerr to be dadgreed by spmtsoooeer eth dsfledomi pteiron ulodw ndee ot be eeptrns in het tosylco rof naouibut.ni It it aaucmltdecu in hte RRE ehtn who edos ti egt gga?det tlH,oseny os fn.o.il.ccdte

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sajaqua1  So dyrirlanoi a sifldeodm entproi seod negurod niiiuonqutatib and oiss.epltyor It si onaetleb ttah FCRT iilmdnofsg 'ndsteo evne lolaw it capees hte E,R os it ulamcsaecut in eht ER +9



 +4  upvote downvote
submitted by drdoom(1206)
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ehT FCRT reonipt si a aranmmesentrb onet.rpi kLei lal srnptoe,i sit rtaionslnat ingseb ni hte tysoloc; htat asd,i RTCF sinoatnc an mesiNtrn-u “lgnsia eenqu,e”cs hichw senam as ti si niegb ltd,raneats ti (nda hte eroibmso kmiang !i)t illw eb eastprdotrn ot eth soinlmpacdE Ru.tumeli^coetnooft!

sA it estg edaraslt,nt sit rocyhohdibp otmsfi iwll meeger, hwhic esbmed hte FRCT rtpineo hniitw eth ipopslohhpid iyalber of the RE flesti! taTh msean hte peornit lwli neerv gnaia be odfnu n“i teh tlcsyoo” aceuebs ti etsg htdreeda gtrhouh the ibealry hi(chw si, in f,atc how lal meenbrratsman tepnoirs oecemb mreramnstenab tirnosep ta eht lecl eucfsar -- thye aehv ot be mdae onti mebrmarnnstea tosrnepi ni hte ER s.!ftri)

,So es,y uemallt,ity teesh molsfdide nesitpor will eb ereditcd dotraw a stomroaeep fro nig/glnr,caridcaeeotdy utb that lilw hpaenp sa a ttiell lieecsv (ro li”e)m;s“opo the mleidfosd otnpe,ir in hits ecs,a is not reltlou-easbw (ic,esn by ifid,tnnoei ti ahs hyrpcidbhoo iomtsf iwhch gte ehd“aedrt hhgtrou” a ibyarel to caeert eht emrnsenartabm enrp)ta,t cwhhi nasem uyo n’owt dnfi ti ni het otcyol.s


\ !nftootoe \ hTe ihtchgni of iavt*ec miosbrsoe to hte Esmdnaoilcp Rucimutel is ywh ew alcl ttha eraa fo RE uoh“rg noapcEdlism lcRtimueu )”(E;rR on cnrteoel csociomr,py ttah ocsneit wsa sbdelkpeec ihtw titlel ts;do ,relat ew (uah)nms cievroesdd tath ehtse sdto eerw ebr!mooiss

\ * \ By ita“vce obmrei”oss, I ustj amen oersomibs ni het eosrpcs of iontcrnvge mARN ot pi!rtnoe Whta( ew lcla rionn“”ttasal ;)

orF a tgrae tiletl srumaym fo het osicmnEplad mRltuecui nda( naym rtheo ccpeotsn ni ealcorulm i!oy,)obgl ese thsi mfro lsrtAe’b laMorucel oylBoig fo teh leCl:
bs/n/nioiw1nAo6cwwvg2kN#tmKt82.4:B./l2/h.o/b.ph40s

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drdoom  ^ mI' tsju rniega-tst in neo ceotmmn hwat I weort in tpleumli msbosucmnet o:ebva nbc:w7t/nx/1epa#s2es/e3m/9o4.rh3mnmetsb99a/m +

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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Wenh etprinos ginbe edma in eht RE mdisl,fo htye uctecuaalm in hte R,E whhci tenh isrgtger mhte ot eb itsp tou iton hte lcootys dna becoem dreeagdd by reaotpmosse. s,Tuh the ctimuluancao fo het idlmdsefo nroeipt in hte RE si irdueeqr rof hmet ot liauemlytt be aedggt by uuqtibini dna be degdrdae in tprosomeaes.

envE fi uoy graue ahtt hyet iwll be ltanugmcuaci ni teh toslyoc scbeeua emproaseots era in the tloo,syc hte qesutino si ksagni werhe ear eth rtpeonsi ncuucagltmia, ton bigne degeddar. So yeth can't cemcluatau in stsp,meaooer aeusceb ethy ear edtedsyor in ht.me

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drdoom  ecni chatc iwth het amucltn“ugia”c m!krera ,qq ewhn you asy eg“tsgirr htem ot be itps out oitn eth scol”,yot od yuo eahv a eousrc for ?tath 'dnto aerlcl ealngrni that hernawye mfsel.y !txh +1
therealslimshady  I cna't rbeemrme ewher I eadr hist tbu it utkcs twhi m,e I tnkhi it wsa a lcel iob obko +



 +1  upvote downvote
submitted by mutteringly(33)
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isTh si mofr sabo:sm aMudtte TRCF eneg (50F8Δ tonaium)t → mleifdsod neporit → tveiecfde otipenr si derienta in eht rohug saepdlncomi ilcmetruu r(ER) for dergtaiadon → ga-deTAtP ihecldor nehacln is staebn no hte llce esfucra of hielatipel slcle tohugouhrt eth dboy e,(..g tseatnilin nda psaotryerri aili,eepth stawe dl,sang nreoxiec nare,csap eoirxnce lgdsna of oeutrcidpver s)gonar

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 +0  upvote downvote
submitted by unknown001(9)
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RTAUL P.LEMIS

th.eer1 rea nmay ivraasnt fo cyscti sofbiirs so tsih stoiqneu is ton tbuao pys.pthhay fo CF

poin.t2 of nuiqstoe : erhew odse etrpino lfiongd crcou ? )rensaw RRE

  1. IN STIH YPET FO CF , fi eoirtnp tsion ddlefo eyorlppr in RRE lliw ti go tuo or lwli ti mctauuelca ? wns)ear it llwi amcluueact ni .RRE

PIT : FI OYU KEEP ENRASREGHCI ON NIVRTAAS FO C,F OYU REA ON A HPTA OT SLENDES OOMD

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submitted by blah_blah(1)
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l efhlpu.cfo/aevpmH3osajspQumwn=liiyNcotGh/esc=y:hyw?hw&u;neIbwo_gbaanaXutlt/tgB.

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submitted by welpdedelp(270)
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milg2v2/kga81M0ttHp2ng_.7sgM3e/_pdsF1Loos=5?:_h115e2i02.n5h_932o/mwP_T32/n/s49e4eiyn/93C5n8r129.s/i.bpc0

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