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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 tnkhi mroe rlnga,eely notprie figodnl phasnep ta hte RER dna the etms ayss het pneoirt ndte’os dlfo elyoprpr. eySc,afilclip teh stmo oomcnm CF aintmotu is a deomdfisl ieotnpr dna eht noerpti si teaenidr ni het RER dan not trrasentpod ot eht ecll menbrame - FA 9201 gp 6.0

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uroosisyed5  chWhi kemsa nsees fi we khint buato teh ahpytsoph fo atdeevle lC- dan aN clue.llltnayrira otBh fo heest snio go up sndiei hte lescl eud to eth reeitonnt fo the isfdoemdl etonisrp ni eth ER.R +
lilyo  I uytllcaa riedgeas twhi hist gnio.snera eTh hoogsolypitaphy ni TRCF si tno ued ot utalanoicmcu fo efisdomld nserop.ti It si ued ot dssnd/eeabeceatr TAP tdaeg remtraembasnn ilrehdCo c.lnaehn oAcgndcir to ,lwUord het sdedmcoi peionrt is ddcteeet by eth cipdsEmloan iemuRt.lcu heT lbomanar tenrpio si tdeagrte orf doetitcurns by teh ooteersmap dan enver csehera eth elcl uafscr.e rTehe si ON ttnoenire of siddfelom re,opint reteh si tdndeorgaai fo sldefdomi epotrin dan ehfreeotr nbcseae fo relodhci nhscenal on teh ab.menmre sThi is what elsda to rimadpei volaemr of atsl mfor eht swtea as elwl sa edecdears CNla ni uu.csm I ntdo khitn the ernasw lhousd be .RE nCa nnoaey eltl em fi I ma sigsnmi stmoiheng erhe ahtt saemk het easrwn ER sa ppdosoe to lsacoytmp? Bsueaec teh ayw I ees fi si ddoeflsmi ornetisp og form het RE tion eht ocalytspm to ahcer eht mtesraoepo dan ethn be erd.setcutd wrUdlo ieqnsoust ID aer 508, ,028 1,154 nda 9.931 +19
drdoom  iylol@ ehT TRFC is a nreabramtesnm npe.oirt Lkie lla itosrpn,e sit osnratlnait bsgnei ni hte lsyo;cto tath ,sdia CTRF naonsitc an ien-utrmNs nali“sg neecqe”us, hcwhi smaen as it si egnib lnttaaresd, it and( eht risombeo aimnkg i)t! illw eb etortnspdar ot teh dsniEomcpla Rte^!tifmceou.ulootn sA it tesg drtna,lsate sti hoibycdhrop omtfsi lwli rge,eme hwhic ebemds teh RTFC oipretn iiwnth het polspihiphdo rleybai fo hte ER efils!t haTt sneam eth ntioerp lwli eenvr naiag eb oundf ni“ hte otlyosc” bsceaeu it stge erhtaedd rotghhu teh byariel (hwchi ,si in ctfa, hwo lla enarerbanmsmt nesitpro boecme mnsrarbtaneme proentis at het ecll fracesu -- yteh aevh to be eadm tino srnmaaemrbten rtnpeiso in teh RE rf!ti)s. +11
drdoom  ilyol@ (intnoc)deu S,o yse, tyume,tiall tehse fomledsid soenptri will be ieddcetr odwtar a ptomesareo fro lgoc,/eidtiaraynredcgn tub htta ilwl enpahp as a liltet lseivec (or pi”;solm“)eo teh isedlfdom ,otirenp in this cs,ea si not aoetr-wluelsb e,nis(c by oiditn,enif ti ahs robhyodipch ftosim hwchi gte er“dhteda hthg”uor a eiarybl ot teerac teh senbtmaarremn tra,net)p hchwi esman uoy otwn’ dnfi it ni hte .cotlyos +6
drdoom  o!^fontteo : eTh omevnetm of iteca*v bimoessor fmro het socltoy ot the smaclipEdno uelitmcuR is wyh ew lacl taht eaar fo RE ogrhu“ aliEdcmonsp euimcRltu ”;E)Rr( on leoetrnc omr,siycpoc tath ntecsio wsa edksebcple htwi ltltei ;tdos ,ltaer ew h(sunma) crdsediove thta heset dsto eewr isebsoor!m +1
drdoom  * yB avic“te siemobr”s,o I tusj naem eoiromsbs ni het opsercs fo civegntrno RANm ot t!pniore Wa(ht we alcl tas”rtnla“ion ); +1
wrongcareer69  Hwo nmya ngodamd wasy ear yhte gogni to etts us on C.F 'mI os orev sh!it +2
furqanka  asol in ,AF dernu hpala 1 ptts,anyirni sit yssa e'fidodlMs nege toucprd pnrotei aegesgtagr in heelcplaoltaur ."ER tihmg eb teh seam epcot.cn +9
joanmanuel26  nocAdicgr ot Klnpa;a llA proisnte taht are htizndyssee ni eth RE msut dflo yctrrecol ni rrdeo ot eb rntaeorsptd ot hte goilg arpaastu dan ehtn to rieth afnli teinstaonsid. If teh mttoauin caesu a dfeldsmoi pione,tr eth ruelst wlli be het osls of eht nteiorp nuitofcn ,nad in smeo a,secs tuocmalincua of the ieprnto ni eth R.E +1
drdoom  l@oyli gkihnTni tbaou thsi eor.m oYu lilw otn ndif eht sid(demofl) nitorpe in het coylso.t eTh dlisfmode nriepto amy eb edniis a seoaen—amdrpto a mrostapeoe mya ievl in teh tybo—olutsc hte miosfdlde ienoprt feislt illw veenr earapp in eth tsloyoc. hTe rsutcdop fo its iodaardtgne ghitm itonnc(tseut mnioa cdias ro allms eepp)dits utb if oyu ahd an tndaobiy ofr eht doldfisme tpornei dan skade it reeWh“ si eth elsdoifmd piro”nte?, hte tbadnioy oldwu anrse:w Ms“to of wath I uocdl nfid apspare ot eb ni eth RrE.” +
yesa  ckhCe uot het iacxennl ,ylcec llyusua onprtise htta ear eadm in het ERR dna fmdeilosd gte aeggtd nda fr'del'ode nad nthe ndcnesa gaain rof eporrp .iondn.fl.gad fi hety laelyr tnc'a eb ,rdefoled y'heert gddedaer etnh adn teerh! So teh oyln acpel slfmeidod CTRF olduc cumletucaa if lmesiodfd .i..R.E..R.s (niLk to xniaecln eclcy: n8s02Ae2UD&&D#gpa8mDPphHgtsRpQy4gl&ho3;425vL0QYKw.oV9mmpj12hae:QjpaKqL=cA;b;ssaaFeT:0w8?=aU1IQZ4/gWKhpAmpiU+XmCV;Ug=tkmesx7xaraw5&wOMtma9EIba5hb=8biCgQemr6iA/5+w.icHr_8Btuj&=osovsi3&;Ihrmai&mOh9;e/rHaX=Is=Ma==m1Yw7rcgZofnsucp7BhdeeocAE17;Urll) +
amy  02AF02 :47 " nstebA or cniyastudlofn PRS n(ilgas notecignior )lcptriea lrseust in aomaunlicutc of erponit in het soclo"ty +
drdoom  ,yam@ t’hsta a dgoo ptino btu it uasemss the nteopir is hoiwerste arlnom, .e,.i ont ddieflsmo ro alo“mnba”r ni some horte way +

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 hvea an seisu iwht tsih tuoesinq ihcwh olsa foilncstc htiw d.WlrUo nI erord ot be reddgdae yb sspomeroeto het lesddmoif irnpteo wolud deen to eb etenrps in the slcoyot for bi.natuunio tI ti cdtulaamcue ni teh ERR htne owh eosd ti teg degatg? onltyHe,s so noctcd.fe.i.l

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sajaqua1  oS laiironyrd a oddfmesil tiponer soed erudnog nibuoquitinati nda slirseoyop.t tI si oebtneal ttah TCRF mdsoifglin 'tesond eevn awlol ti eaecps eth E,R so it aaeulmcusct ni eht ER +9


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 +4  upvote downvote
submitted by drdoom(1206)
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eTh CFRT ritepno si a rasnmanmreebt ipoe.nrt kLie lal reonspti, sit slraninotat nbeisg ni teh sylcoto; taht s,adi CRFT nstacino an remtns-iNu n“gsial e”uenqsce, hcihw saemn sa ti si negbi adanre,tlst it an(d teh rsmoeiob igkmna )it! wlli eb drotrpnaset to the Epncomladsi le.^mctuiRunfetoo!to

As it estg trls,edatna sit pdihbrcyooh tsfoim lwil geree,m hhicw seedbm eht CFRT otenipr iihwtn eth poihsiplodhp eiylbra of teh RE fest!il Thta eansm eht tironpe illw nevre gania be fdnuo in“ hte to”ocsly sabceue it gste ehrddtea hthrgou eht elairby h(cihw i,s ni ,ftca hwo lal asnemrtbanmre eintsrpo cmeeob aetearmnsbmrn oipetnrs ta the clel rcefsua -- tyeh veah ot be dame otin mstmrnanbaere etironps in het ER t.fir)s!

So, ,yes tilley,matu etseh elodsdimf opnseitr iwll eb citeerdd twdrao a aeetspomor rfo drntlaicci,egga/oydnre ubt tath will pepahn as a teltil sliceev or( ;m)p”seil“oo eth dmdfsloei oerpi,nt ni shti ,eacs si otn wlrlo-seabtue s,(nice yb idonfne,iti ti has bhdrcoyhiop mtsfoi iwchh egt “adderteh gh”routh a alreybi ot rcetea the emrnnamtbears ,tpena)rt whhci enasm uyo ’wtno dnif it ni hte cyoots.l


\ ootn!oetf \ Teh hngtcihi of ac*vite rmioessob to eth paoEiscmdln iutcemluR is yhw we clla tath aear of RE gohu“r Einmocapsld iclutRemu r”);(ER no teolrecn comyrsci,op atth etcsnoi aws ledskbpcee hwit lttiel ts;od tlar,e we na)(hmsu osecedvrdi thta htese tsod ewer reiosso!bm

\ * \ By e“tvaci smiobose”,r I ustj enam msoersboi ni teh scerpos fo ncorvintge ARNm to tin!eopr (Wath ew allc “astrtnoa”inl );

orF a rtega littel ryausmm fo teh npamEoscldi tuRliecmu adn( nmya troeh npcesotc in cmraouell !,igb)oyol see ihts omfr lAerb’st cMuorllae gBlyioo of teh lleC:
./bhv442bmn1#g:o06lnwt8///cosotiw.p2wN2iA/s.KkBhn.

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drdoom  ^ Im' sujt n-argtitse ni eno mnomcte thaw I wtroe in iultelmp mosemsucbnt evao:b sr1cw2n3tmnnxo./ht939ss/m#4pbae/7am/9/b:eeme +

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

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 +4  upvote downvote
submitted by therealslimshady(42)
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Whne piesnrot gebni mead in the RE oimd,sfl ethy cluutemaac in het ,RE which tehn tggsrire them ot eb pist out iton the csoolyt dan bemeoc gdarddee yb etmpr.sosaoe Tsu,h eht ucaontilcamu of teh odeldmfis roptein in hte RE is rdqieeur orf mhte to ttemyaulli eb ggtdea by biuntiuqi adn eb geddadre in taeopomres.s

nveE fi ouy eugra thta hety liwl eb tnuacmcaiugl ni teh loycsot ecbsaue mapotsresoe rea ni het ocltys,o hte suetnioq si igakns erewh rea the pitoensr amgiunaucclt, otn geibn adderged. oS etyh n'atc lauucemcta in tampoeress,o usebace yhte ear yteoeddsr in hem.t

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drdoom  cnei chact with het m“icncultua”ag rmae!kr q,q hewn yuo say grtir“sge hetm to eb ptis tou nito eht t”,olocsy od uyo avhe a eucors for tth?a tdo'n llcare nnriegal ttha earynhwe slyfem. x!ht +1
therealslimshady  I tac'n rmeermeb erwhe I eard thsi ubt it utcsk twhi ,em I tinkh ti asw a lcle obi oobk +


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submitted by mutteringly(33)
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Tish is rfmo bmosas: daMutte RTCF eegn 8Δ50F( )tnotmuia → emdlfdsio rpetoni → evitecdef etrnopi is inrdaeet ni eth ogurh moadepiclsn urlceitum r(RE) orf ridaaeogntd → TPg-dtaeA ocheldri nnelhca is bsetan on teh elcl srcuefa fo eltiahlepi ellcs turhugooth het yodb (g.e,. ienitlasnt adn oprsatryeri itelp,ihea ewats ,gdlans exionrce arsnae,pc iroecnex sldgan of ivecreudotrp n)gaors

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submitted by unknown001(9)
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TARLU IS.LPEM

trh1ee. era amyn trainasv of iycstc iifosbrs so htis snitoueq si ont tuoab ty.hyapsph fo CF

o2pt.in of eqiuosnt : wehre odse prinoet gdonifl crocu ? )raensw RRE

  1. IN ISHT YPET OF CF , fi enoprit otnis ofddel pyrrpleo ni ERR ilwl it go tuo ro will ti auaccetulm ? )erawsn it liwl cemuucatal in ERR.

IPT : IF YUO KEPE IEGNRCERSHA NO RAIVTNSA FO ,FC YUO AER NO A APTH OT SELESND OOMD

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submitted by blah_blah(1)
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lhpue fly:ewoa/uiyI_a&ajlaweBnonvaXpmGhs?tw3o/c.wlbmg/h=ugsnQt;pyecuc=is.ofttNbHh

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submitted by welpdedelp(270)
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2_s9/14./0dpMi2amT/tC50n581:l9mw4._?.n8h5Mhikgg/e1io5L_p2.293evi3_gn10so23et//gys_s2r=9FPse/opc2273n1Hbn

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