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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 hinkt erom rl,geeynal retipno indfglo saepphn ta hte ERR dna teh mtes sasy het eiprotn s’tdeno ldfo plryep.or ayeiScp,flcil eth most ncmoom FC totnaumi si a fmiedsdol ertinop and hte trinpoe is deainter ni the RRE nad not osaprtdretn to eth lecl embarmen - FA 0219 gp 0.6

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uroosisyed5  hWich kmsae eenss if we tknih boaut het phasotyph fo eedvelta lC- adn aN claeutyrrnll.ial ohtB of ehset onsi og pu insied hte eclls ude to eht eotnritne of eth osdleidfm itopsren ni het ER.R +
lilyo  I tallcyau sgeredai twih htsi .naisnroeg ehT syapgythophlioo ni RFTC is not edu to uinoacltuacm fo esfimddol on.prtsie It is ude ot eeedaasbnt/rsced APT tdage rmamtenrbesan rieolhCd henl.can Andcogrci to ,orUldw the mosidecd oeinrpt is teetedcd yb teh csiomnEplda mlctiuRe.u heT rolabmna pitrone is teatredg ofr icoturtsned by the tsopareome and nveer reachse eth llec r.fucase eeTrh is NO otreinnet of fmeddlosi eo,npitr teehr is aoigatneddr fo midoefdls tpioern nda oeftrerhe sabcnee fo ohideclr nshealcn no the anremmeb. sihT si tawh sadel ot iadmrpie vrmelao fo astl rmof eth tswea as llwe sa ecaerddes lCaN ni sm.cuu I tond tnhik hte aneswr odlhsu eb .RE aCn yeonna tlle em fi I am simsgin moihtgens hree hatt mkaes eht snrwae RE as peosdop ot m?aclyspot eBsceau hte ywa I ese if si mleodifsd epornits og mrfo the RE otni eht smlytocpa to cerha het oetresoamp dna ehnt eb dsrtuced.et oUwlrd outsiqnse DI era 8,50 20,8 1,154 dna 9193. +19
drdoom  ily@lo hTe FTCR is a stnabmrenrmea pnet.rio eikL all neoirs,pt tsi atianrlntso gnbies ni het o;syotcl atht s,dai TFCR ancsonit an srN-umiten as“gnil nu”eqecs,e hichw masne sa ti si iegnb teladsnr,ta ti nd(a eth besrmoio kinagm i!t) liwl eb arndreottsp to eht smalpcEinod uietfntt.Rcloo!oeum^ As ti tges n,eadatrstl its brhiopocyhd itofsm illw e,eremg ihhwc msbede teh CRFT irpento tniwih the dlhiishpoopp iaeblry of teh ER sfi!tle aTth seman het rnetoip llwi reenv agani eb udnfo n“i het tsyl”coo uecaseb it tsge readehdt ohhurtg het bayeril iw(chh i,s ni fc,ta hwo lal sabrmennartem tpsniroe bmeeco rnrmtneasmaeb otinpers ta eht ecll cufsrea -- htye ahev to be daem itno nmtrasemrneab reptisno in teh ER !ifst.r) +11
drdoom  yo@lli (toinud)nce oS, sey, y,lamttiuel seeht fdisolemd tipsorne ilwl eb eetidrdc tdroaw a tepesromao fro galicteodrndge,yc/rnai tub taht lwil ahenpp sa a eltlit iesvlec ro( m“oos”l;pei) het ldsmfiedo ieotnp,r ni sith sa,ce si not ebealtwo-lsur ,esni(c yb ifidnei,ont ti ash hcdpboiorhy foismt wihhc gte tradeedh“ uohtgrh” a ybrieal to ecaetr hte ntsmabemaernr rantp)e,t cihhw smane uyo ’tnow difn it ni teh lstyo.co +6
drdoom  ^eon!ttofo : hTe emmoevnt of *eitcav bemssooir mrfo the olycost to teh dsomncEailp mcliuuetR si hyw we lcal ahtt aera of RE “ghoru nioEspldacm lRitucmue ”r;(ER) on elntreoc icrompo,csy ttah ntcsieo saw sbeelpcedk wthi ltitle so;dt re,lta ew mhsun)a( orveidsdce atht eseth dtos ewre srbi!eomso +1
drdoom  * yB ati“evc osmibo,s”er I juts nmea moerobiss ni teh pcsosre fo nvctgroeni ANmR ot into!pre hat(W we lacl a“ntlto”nsira ) ; +1
wrongcareer69  oHw yanm ndaomgd aswy are yhte onigg to test su no CF. 'mI os veor hi!ts +2
furqanka  asol ni ,AF uernd lpaha 1 niprytatin,s its assy dfedlo'iMs ngee uodrctp iertpon setgagreag ni raahetlplocule "ER. htmig be eth emas np.tcceo +9
joanmanuel26  orgcniAcd ot paK;lan All pnsrtieo ttha aer henezsyistd ni eth RE msut ofld oyetcclrr ni erodr to eb prttnoedras to eth oligg aauapsrt adn tneh ot trihe ifaln asd.tneitnois fI the atminuot cusea a fdmsdloie tnio,rep hte leusrt lilw be teh lsos of het tioernp fncintuo ad,n ni meso s,eacs uocatinlumac fo hte rptenoi in the E.R +1
drdoom  yl@iol gniiknTh utoab thsi m.ore uYo wlil ton nifd eht )loe(dimsfd tirpneo in the ol.otcys ehT mddlifeos trenpio amy eb nidise a eaodnt—mpasoer a toperoasem may eliv in eth u—ycbloostt the lfdedsimo ropinet etlsfi iwll rneve raeapp in eth ocly.sto The srcduopt of tsi dnaraeigtdo htmgi ncsut(neotit nmaoi icdsa ro lmals psp)edeti but if you had na odniatyb fro eht iomesdfdl etnoipr dna sdeak it Wr“eeh si hte oldmsifde orp”itn?,e eht iybnoatd udwlo awes:nr s“Mto of awht I olduc nifd espaarp to eb in teh RE”r. +
yesa  ekhcC tuo teh nnilaxce lceyc, llasuyu ntiersop taht rae dmae in eht RER dna lidsemofd etg gdgeta dan ofleedr'd' nad nhte necdasn agani for rorepp aolin..nd.fgd if tyeh rellay tcan' be feeld,rdo 'ehtrey ddegrdae nhte nad erthe! So eht lnoy peacl semfdidlo RFCT oldcu ceauamtulc if mdlfosdei R...i.R..sE. n(ikL ot nxneilac lc:eyc uma2Z:;paHro;lmwhm5c8&ahpjiwt/?hg0os:4agKDQ8;Q&7eK/8IanmtiaP2ac&omenV=bksgc;m2yeew#KI=vd5ism=aOaej4hisprqcB&abUAh7O.6rXQ915p8bDs;7VA.QtrsZ&Ug/Aps1ghMru=svmcHA1g572oegQe9xt=0=1&lh_R=wfYwUU8MeAsWLCrio=ExIE0pwh3L;l+&Fp+Ta3Bo=CIaraY;9i4DbUHpmXmjm) +
amy  F0A022 :47 " snbAte ro cslutnaoyfdni SPR ilgsna( tecogroinni rictla)ep srsulte in tacaluominuc of nripote in hte c"osloyt +
drdoom  may@, satht’ a oogd onitp tbu ti samssue the npotrie si iwerehots n,lamro .ei., otn ilsmddeof ro baa“lmn”or in omse herto 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

+/- drdoom(1206)

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 +4  upvote downvote
submitted by seagull(1933)
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I heav an essiu htwi ihts uotisnqe wichh slao tsilfnocc wiht Wd.lUor nI rored ot eb daeedgdr yb oermpessoto the lmediodsf ienpotr louwd ende to be nertesp in hte slooyct fro iitbuuaonn. tI ti eadlmauctcu in the RRE enht how sedo it tge gage?dt ,nsotyHle os .ditn.cc.elof

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sajaqua1  So iiyrrnodal a midodfsle eiportn soed ogudenr ubinoqiintuait and pistrelsooy. tI is aelebton htat CFRT lfdgmoiins edont's eevn alowl it ecasep teh E,R os it uaclutmaecs in het ER +9


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 +4  upvote downvote
submitted by drdoom(1206)
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The FCTR nerotip is a rrntanmebaems .tnreoip ikeL lal roespit,n sit ilarntsatno esnigb ni the y;loosct hatt das,i TRCF cnitsnao na mtsruN-nei nisa“gl qence,”seu hwich eamns sa ti si begni dlrtea,satn it and( the boosirme gnikma i!t) ilwl eb ronetasrptd to the acsimdolnpE Ruiltmuec.^oto!ntofe

sA it steg aratden,tls ist bcdhyrohpio smotif lliw eer,egm ihchw smdbee het CTRF rtoinpe iwhtni het oshpiihdpolp alybeir of hte RE sef!lti tTah naesm eth ntreiop wlil renve aiagn eb fundo n“i hte so”olytc acsueeb ti gest detaedrh rguhhto hte iylraeb ci(hhw i,s in ca,ft who all beammtnraesnr poneistr coebem erermmanbasnt oistnerp ta eht clel urcsfae -- yeht veha ot eb eamd into mnbesreatrnam opisentr ni hte RE f!r)st.i

S,o s,ye myaue,tllit sehte sdomdlfie etopirns will eb etedridc rdowat a oereaomspt rfo /cd,cgrrntnedialaoeygi tbu thta wlil ahnpep sa a tlltei veliesc or( s)e“”oio;mpl eth loddsefmi ntie,pro ni shit csae, is nto elsewrutoa-lb nc(ies, by dti,ioenfin ti has hhciproydob omisft chwhi teg tdeea“hdr hugrh”ot a yaeribl ot eterac eth rameanmnbetrs tert),npa hchwi asmne uoy tno’w ndfi it ni eth .oscoytl


\ !ttofonoe \ Teh cithgihn fo cavie*t sisbeoomr ot eht lmEoniaspcd ticReumlu si why we llca hatt eara of ER groh“u pEocilnsdam cieuRumtl RE;(”r) no lronceet ocrsyp,mcio ahtt neiotsc swa plesckbeed ihwt ttliel o;std rl,tea we ns(aumh) cevsreddoi thta sthee otds were somsobire!

\ * \ yB eic“avt sobmi,re”os I utsj neam mobeosisr ni the sescpro of geocnvnrti mNRA to nreiop!t t(hWa ew clal ”taliao“nsnrt ;)

roF a arget litelt muysamr of teh amplicoEdns teRlimucu dn(a amny otreh eocsnptc in lrceuamlo gly!i)o,bo ees sthi mofr ’lsAertb lroecauMl Blogoyi of hte lelC:
8k4/w2ssn2n/2/4nAhh:o.tm0v..6wpii#ltc.wgoB/bKNb1/o

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drdoom  ^ 'Im jstu asnt-ergit ni one netmocm htaw I oerwt in umletilp smecsmtbuon vo:abe nsm/e/e9mcn/ma#p3esbw29etom1s.b9arht34:n/7/x +

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

+/- drdoom(1206)

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submitted by therealslimshady(42)
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hneW ionterps ebgni emad in het ER islo,dfm ythe atlcucemua ni eht ER, chiwh neht rtiegrsg ethm to be pist otu onti eth olsytoc nda boecem drgeddea by oostmaersep. hsTu, hte ilumatnucaoc fo teh fsdmdieol nproeit ni the ER si ereirqud for mhet to tlaleytmiu be gtgade by tuuqibiin nad be dergddea in e.optearssmo

Evne if ouy ageur thta eyht wlli eb tunamaclucig ni eht lysootc sbaeceu aosoptseerm rea in hte c,olysot eht neiutqso si saingk hwree aer het repnstio ualtugicnmac, nto genbi regddeda. So tyeh 'tacn ctcuemulaa ni asrotpmesoe, eeuascb ehyt rae eyodetsdr in htme.

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drdoom  icne hccat tihw hte ctu”nugiacaml“ rk!rame q,q newh you say ggsrti“re ethm ot be ipst uto tnio teh loc,sot”y od you aehv a soceru rof ?atth d'tno lrleac ilegnnra atth reenyahw fm.lesy xt!h +1
therealslimshady  I an'tc bmereemr rweeh I rade isht tub it skutc thwi e,m I ktnih it was a lelc ibo bkoo +


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submitted by mutteringly(33)
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hsTi si frmo :abmsso ueatdMt FRCT gene 8Δ(F50 iao)untmt → iedlsmfod npiorte → vctieedef npioetr si nrtaedie in eth oguhr sionpeclmad cerilumut r)R(E for dtoandeairg → -APTgatde ilrdheoc clnahen is besnta no eth llce faucers fo leplthieia lscle otuohurhgt eht bydo .e(g., itnneitsal nda asoryperrti hiaptee,li tswea dnlg,as ceeoxirn pnraas,ec coxreine dagsnl of iceerdrptuov ang)sro

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submitted by unknown001(9)
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ARTLU ILME.SP

h.re1te rae yman aivtsnra fo scciyt obssiifr so shti teuqnois si ont oubat phyyahts.p fo CF

2oi.pnt of sineoqut : wereh dsoe rinptoe lingfod rcocu ? we)nrsa RER

  1. IN ITHS PTYE FO FC , fi petorni oints fodled eporlyrp ni ERR ilwl it go tuo or llwi ti aealmutcuc ? r)wnesa ti will lccmuauaet in RER.

PIT : IF UOY KPEE GERECIHRANS ON AVAINTRS OF CF, YOU ERA NO A PTAH TO SSLDNEE DMOO

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submitted by blah_blah(1)
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lhplfe uhwbtoeQjaaatuchBp_i=oXoh.nytua/?Iiyw3cg&mpGvnybe/etsaluscHmwN=l./n;:sogfw

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submitted by welpdedelp(270)
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19senC59yi1Msp/=.b2232_9LmmP2rsg4tiFn31/ico:2egn3oa2.t?72ivs0__15npg_he40T0ep23_oMh/gn8/8.wd91l.H/5/ks/5

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