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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 hinkt more ryleae,nlg teoprin liodngf hppnsea ta the RER nda eht mtes yass teh eoitnrp tesdon’ dflo epr.oplry efcacli,Siylp teh toms onmmoc FC tmounait si a msdfdolei noprtei adn het oinrpte is eaedrtin ni the ERR dan otn prrtonsdtea ot hte lelc eebrmanm - AF 2901 pg .60

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uroosisyed5  chhWi skmea esnes if ew hitnk touba teh pshyoahpt fo avedeetl lC- adn Na irrlcan.yltellua hBto fo ehtes osin og up snidei eth cslel eud ot the eontertni fo eth msdlfeido rpetnosi ni the RER. +
lilyo  I utyallac rgdeseai tiwh tish nsngraoie. ehT tlspayyghoooiph in FRTC is tno due ot nuaaotucclmi of edsfiomld itre.spno tI si eud to ebessacaen/reddt PAT gtaed eetmnsrrmaabn idrolehC lc.nhaen ircAnodcg ot rU,ldow het dosdeicm poirnte is ededetct yb eht clpoamnidEs ecmltuuiR. hTe armnalob oripnte is dtgretae rfo ocnteisdrtu yb the aspoetremo dan ernve recahse the clel ecsfa.ur erTeh is ON noeitnetr of elmdidfos einorp,t teerh si ageidtdrona fo eilsdmdof itnrpeo adn eertofreh eaebsnc of rdieohlc ascnnelh on the amnmeb.re sihT si thaw dlsea ot rdmepiia vlroema of tsal rfmo hte tweas as lwel sa rdscedeea NCal ni cum.us I ndto itkhn eth sanrwe oshlud be RE. anC yenoan tell me if I ma msgiisn nhsitgmeo reeh atth ksaem eth seawrn ER as oodpspe to myatlo?spc uaecBes het awy I see fi si idfledosm pineotrs go mrof het ER tino hte caplmytso ot cerah eth mrpseoeota nda hnte be sd.ctderetu wlrUdo ouisqnset DI rea 058, 2,80 11,45 dna 19.39 +19
drdoom  y@lilo ehT FTRC si a trameanrbmesn nrei.pot Like lla pitns,roe sit iotslaatrnn nsebgi ni eth ys;lcoot hatt i,ads FTCR anncstoi na Nn-emuirst iglnas“ cn,eu”eesq wchhi esmna as it is bgien aas,rldntet ti (dan the rsmobeoi gianmk i)t! ilwl eb etrsoapnrtd to the Esomlancpid mneofect!o^t.tuuRloi sA ti segt nasetldart, sit yoichopbhrd tfmois wlil megree, hhwic mdeesb het TFCR ipetron wntiih the dhplphpisioo brliaye fo teh RE siftle! athT nasme eht optienr llwi rneve giaan eb undof n“i hte oc”otysl ceauseb ti etsg erhaetdd rhthguo het ierybal i(hwhc i,s ni ,catf how lal anteramebsnmr toinspre obemce emrnmaanterbs ensopirt at the lelc rcefaus -- htye aehv to be aemd iont mreanrsenmbta ertsiopn in teh ER f)rt!i.s +11
drdoom  oll@iy dicetu)no(n So, yse, ayeiml,lttu heest eddiflmos oeinrpts illw eb cddeiert rdtowa a emoproatse rof neacloigyi/n,retdgcard ubt ttha wlil pnhepa sa a lltite vslecei (ro )so“”;lieomp eth ldesoidmf pnoitre, in isth seac, is tno s-eabwterulol (niecs, yb ndneof,iiti it ahs cdohiobpyhr stiofm hciwh teg radeehd“t h”rgutho a blaiyer to aceert the baremsemrtann rt)ntaep, ichhw easnm uoy n’tow nfid ti in het o.olscty +6
drdoom  ^ttfn!oooe : The mntmeove fo eitvac* reosbsmio omfr hte tyolocs to teh licospnmdaE tuluRcemi si ywh ew clal taht reaa of ER “uogrh osanmEpldci ltcmRueui )R(r;”E no letnreco cscporoy,mi atth sncteio was depbecelks itwh ietltl otds; tler,a we smha(n)u vdoiresced htat sthee dsto rwee oros!mesbi +1
drdoom  * By avict“e ssire,ombo” I tujs naem rbseomsoi ni eth rcsosep fo trgneovcin ARNm to eorn!tpi tWha( we lcal nanol”tartsi“ ; ) +1
wrongcareer69  Hwo amyn gamoddn wsay era hyet oggin to tset su no C.F 'Im os ovre hti!s +2
furqanka  saol ni FA, drneu aalph 1 natyisrnipt, tsi ysas odfile'dsM neeg dputcro pironte aggteesagr ni lueohtaplrcale E"R. ghmit be hte emas t.pncceo +9
joanmanuel26  gAdcrcion to a;Knpla All ntiposer tath era dthnzeesyis ni hte RE mtsu olfd orteclrcy ni rodre ot eb trasrpntdeo to hte igglo trsaapua and tneh ot ihetr iflna atds.eonnsiit If the iuonttam ecasu a lfeiddsom pnrioet, teh uslret illw be hte ossl fo hte tnpreoi otcnnfiu dn,a in seom sa,esc tccliaamonuu fo eth ntireop ni hte R.E +1
drdoom  yi@lol kigTinnh obtua tsih .oemr You wlli nto fndi teh )(dsoliefmd eotprni in het .olstoyc ehT oldfimdse nitoerp yam be nidies a rp—stnedaeoaom a stparmooee may vlei ni the oltyt—bocsu the mfideslod epniort stlfei wlil venre rpapae in eht o.tyocsl The sodptrcu fo sit igetdraanod hgmti iettnotc(usn maion iasdc ro slaml pe)sdpite utb fi oyu dah na nabydito fro eth ldsdmoeif orenpit nad seakd it Where“ is het emioldsfd ,ri?”etopn hte iadonbyt wudol awrs:en “otMs of wtah I uocdl ifdn rpsaaep ot be in het R”E.r +
yesa  ckeCh uto teh nclxinae lcy,ce lualyus ioptsern atht era dmea ni teh ERR adn edfisomld etg tgedag and edfoer''dl and nteh asdncne aniga orf rppoer g.n..lodfadni fi tyhe layrle nta'c be ldef,dore rteh'ey deagderd thne dna r!eteh So the noyl aelcp odeldmifs TRCF uocld aacltmueuc fi edldosmfi R...E..s.iR. kn(iL to alxicnne e:cylc &ppDK=;is8w7gso.&asieg=wVa&fvmaY8ghr?Ow2cciBjhailQmcnw0sgahmqptoCa;bUWbQ5=o7e;7a5VhcE1t&0/ac/8biD&ZL4ggu0uw_mk4a3i:Aymm;oM.A&rIKseTxmHp4vUe+Y8=Zhphgr5oprpd1ACMmX+6He1rt5RIao=lhwUeQ=b;p=7LBral&A89;EjthPQFIe=:m3=nUsAax2U;1Qrs9Kjs2mHmD2seX9O#/Ia) +
amy  FA0220 74: " Aetbsn ro iuondcsfantly PSR nig(las rocniegotni ecr)pilat ressult ni naclmucaiuto of ropniet ni the ycltoo"s +
drdoom  a@my, ’ahtts a oogd npito but ti semssau eht oeprnit si irheweost a,omlnr ei.,. ont oslfdemdi or bmro“nl”aa ni omse troeh 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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submitted by seagull(1933)
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I evha an ussei htwi htis niutoqse hwcih losa otilfnscc wiht rl.dUoW In erdor ot be drdeedag yb rtspesmooeo teh sddmlifoe oiterpn odlwu ened ot be prseent in the lcyosot fro obntui.ianu tI ti atmleuucdca in het RER etnh ohw deos it egt tgade?g nlsHeyto, os ic.ntdeolcf..

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sajaqua1  oS rnyadlroii a edsoimfld onirpte oeds egrnudo iibtnqnuatouii and eo.ytlrsoips It si tolenabe htta RCFT gfidnolism doset'n veen wolla it ecseap the RE, os it luctaamceus in the ER +9


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submitted by drdoom(1206)
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ehT FTRC tenrpoi si a esartnamnermb ret.pnoi Lkie lla ns,oitpre tis solanrttnai isbneg ni the yo;clots ttah ad,is CFTR onistanc na rtinNuem-s “glnias e,c”qesuen wihhc smnae sa it si bngie an,dsatelrt it (nda eth misobeor gankim t)i! iwll be rrspanettdo to hte iplomEasdnc ^mRliteuu.cooefto!tn

As ti gste ,nrelttsada sit hypbohidrco otimsf wlil rgme,ee hwich eedmbs eht TCFR ntrioep tiiwnh eht ohspipdoilph brailye fo teh ER leitf!s thTa nmaes the poretin liwl nreev aanig be fondu “ni het oy”olcst seaebuc it sget edrtahed thrghuo het beiaryl w(hich i,s ni acf,t woh all ansarntremmeb tiorpens ecbmoe meesnarbnarmt rnopiset at het cell ferausc -- yteh avhe ot be aedm tino tnaemrnasremb esnirotp ni the ER itsr.)!f

,oS sye, lleyia,ttum thees diofdmels psieontr iwll eb ddcteeir wtador a eoroatsepm for iaeenco,l/adricygndgrt btu taht llwi appenh sa a tiletl cvliees (or ”;mplsooi“)e the msifddleo otirep,n ni htsi ,esac si ton lsrtlow-beaue ,in(sec yb n,ifeontiid it ahs hpioybdhcro tfoims cwhhi gte “eatddreh rhouh”gt a aleybri to teearc het samnrtreanemb nrt,e)tap hhicw emsan uoy ’nwto infd it in hte slcooyt.


\ tooetnof! \ eTh chngtihi fo *viecta ibmsesroo to eht mlnEoiapcsd elictRmuu si yhw ew clla htta area of RE urgoh“ nsipdEoclma mRieutcul R;)”(rE on nreloect csyiocpomr, ttah ncoitse wsa epeslkbdce hwit teiltl otsd; al,ret we unm)hsa( dcdoeirves hatt htese dtos erwe biso!somre

\ * \ yB ce“taiv ibse”osrmo, I utsj emna oiremboss ni teh scespro of toigcvnner mANR ot priote!n th(Wa ew alcl tnln”as“ratio );

roF a rgaet illett rsmmauy fo the lEocnimpdas cmRuitleu a(nd many htoer occnpset in celomural bl,go!)oyi ees ihst rmfo bst’relA uolalecMr Bgolioy fo teh lelC:
mnhc/4K/v21hiws.6Ap0tonnbN8w.Bso4b.2:w/.ilk//go#2t

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drdoom  ^ Im' stuj -tiarsngte ni eno emontcm ahtw I eortw ni puimeltl osnumsbtemc oaev:b hb3/xwes4sn9//an3maetber17cm/t9np2om/.:e9ms# +

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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heWn sroipten gnebi edma ni the ER s,lmfodi htye tlauceucma ni the R,E hihwc htne rirgtges mteh ot eb stip uto oint the tlyocos dna obceem reeddgda by rpeae.smstoo hu,sT eth auclcauonitm fo eth lesidodfm tireopn ni the RE is reiqeudr fro hmte to yeutaitlml eb gdegta by iiqiuuntb nad eb edrgaded ni aooemserspt.

eEvn fi oyu reagu hatt hety lliw be cugnltciauam ni eth ootcsyl esuceba omtsapereso rae in het st,clooy eth esuqiton is ignask erewh rea eht rpesiotn nuuglcmtaiac, nto nigbe raeddgde. So hyet cant' maccleuaut ni tsmeras,eopo sbuceae teyh aer oytsrddee in te.hm

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drdoom  ince achct htwi the i”mgac“ctlnuua rk!rema ,qq whne ouy say tsrgiegr“ emht ot eb istp uot inot het tsoc”oyl, do uoy ahve a sureoc for h?tat 'dont rlclea negailnr atht rewynaeh .mfleys !hxt +1
therealslimshady  I 'cnta erbmerem erewh I adre ihst btu ti stkuc wiht ,me I nhkit ti swa a elcl bio bkoo +


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submitted by mutteringly(33)
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ihTs si ormf :osbmsa utatdMe FTRC eneg (F5Δ08 tmutni)ao → foeldsdim roeintp → eeevtfdic epntroi is rtiednea in eht horgu onslecpdmia mulurtiec E)(rR rfo odtgandaier → geP-tAadT orecldih hcelnan is seatbn on hte llec feucsra of ehleipalti cells ruugtohtoh het doyb ,eg.(. lteiinsant nad rsareroyipt teiilpaeh, setwa lda,gsn crnexeoi ,sraeancp cxeoiren sgdaln of irteerupvdco ns)oarg

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submitted by unknown001(9)
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TALRU LM.ESPI

teer1h. rae yamn tavsainr fo ccsyit irssfboi so stih tuqneios si ont butoa hts.apyhyp of FC

npito2. fo toeuiqsn : ewher dsoe rtinope gdilfno curco ? )nrswea ERR

  1. NI THSI YTPE FO FC , fi tinoerp stoin loedfd orpylrep in RRE illw ti og otu or liwl ti aulatmeccu ? n)eawrs ti wlli uueacacmtl ni .RRE

IPT : IF UYO EPEK EASECGRNRIH ON VNASRTIA FO ,CF YOU RAE ON A HTPA TO NELESDS DOMO

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submitted by blah_blah(1)
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leu lphf.lHnge/jaynoafcgsncwGyXcQ&=.?t/yweutm3ihes;NtbBthshwuoaIliw:vup_o/=mbpoaa

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submitted by welpdedelp(270)
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//_gsT._Htb7_gn/v/2ci5a921ns:o5s_3dm3?hg10is4FPeh.i2Lne1.ye5.m32o5o/n/8_9ntp40CMi=s281gp2e1r9k2w0329M/lp

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