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NBME 20 Answers

nbme20/Block 3/Question#19 (reveal difficulty score)
A 23-year-old man comes to the physician ...
Area labeled ‘B’ (Mitochondrion) 🔍 / 📺 / 🌳
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 +25 
submitted by g.liller@yahoo.com(30),
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mrag ,+ B im,yctloeh nmubiltg tlmt,oiiy omrf kroect lasit rmof anict emapnorztyoili wichh aowll orf ,vnemmoet taallreir,nulc grwos in codl smtpe on km,il fsot ees,hsec iec r,ecma hncul amt.e

siendacer ienicndec ni egaptnnr oemwn yiscllepea in dr3 ismtrtere


 +16 
submitted by usmle11a(94),
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kEwpt-t.toaywvh/e.squ62Awc=AYu/mct?obhw0/:p

gysu ihst deiov xapsilen oalt




 +8 
submitted by jinzo(15),
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A - lenuusc ( itwh cslnouleu diesin ) B - danmcithorio C - ERR ( yuo acn ese cdtataeh omriobsse D) - ?? aym eb ssoylosme E - gnylgoec esrlgaun

weenathon  I don't think A is the nucleus, It seems more like a lysosome with digested material inside. If you watch the video below it shows the relative size of the nucleus to the mitochondria - a nucleus would be MUCH bigger than the mitochondria +5  
weenathon  https://www.ncbi.nlm.nih.gov/books/NBK26858/ There are very similar looking pictures in this article, it must be a peroxisome +4  



 +2 
submitted by lianallado(3),
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hTsi etntaip nrseestp hwit a romniitcohald pmahoyyt cesin eht redrsiod si hideniret rmof eht terohm. naiiotMldhroc pstmheoaiy whso edrgag“ erd bs”eirf no mcluse iyosbp ued ot het uaucaitlmnoc fo dseiades oidonhaicrmt ni eht mmbocselauras of eht mclseu e.rifb




 +1 
submitted by qfever(60),
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esoD yanoen kwno wtah rae ,A ,C D? Fro C ont urse if t'si gponniti to teh imrooebss on R.RE

mI'( gmanissu E is elocyggn easnrlug dasbe on a ncmmteo !wel)ob

drdoom  see @jinzo’s comment above +  



 +1 
submitted by usmile1(143),
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odes neanoy konw what eth ruturtces E is ogtniipn ?ot

thomasburton  Not sure looks like it might be free ribosomes or other such small cytosolic structure (I picked E too, thought B looked way too big!) +  
targetusmle  same here!! marked e thinking of it as a mitochondria +1  
msyrett  Glycogen Granules! They are not membrane bound and float freely in the cytoplasm. +4  



 +0 
submitted by hombremasorca(0),
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Aeynno dfni a emrlpbo ithw eht tems? eesSm to me ttha ti ens'odt leph to astet ,owhere"v ish hf'atsre setsri dan ihrndcle are unte.dfaefc" eW arydlea nwko teh otuanmti rnsu in eht mrt'esoh s,ide thg?ir It esmes ikle ttha teetmntsa stndeo' idasrdc rno irfmnoc nay eictneriahn entartp. Why wulod ew arce obaut eht iptensa't ha'serft ?ised

bbr  It just further helps to tell us this is mitochondrial. I guess they are doing us a favor. +  



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