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Retired NBME 24 Answers

nbme24/Block 3/Question#36 (reveal difficulty score)
A 1-month-old male newborn is brought to the ...
Tyrosine 🔍 / 📺 / 🌳 / 📖
tags: biochem repeat

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submitted by zelderonmorningstar(96)
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naC esmoone eliapxn ywh het sewarn cno’tudl be nanenlple?yaih

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donutsnduodenums  eTh dik sha l,bmiasin whhci si ude ot eraddecse orntsaysie ctyt.iaiv fI he has a orbelmp boemnatilgzi ennyh,Pailelan eh duwol be ngerepntis hwit the UPK xs ikle nuielctalelt dsiiabty,li tmysu oydb do,ro ,et.c ni tidnaido ot hsi irfa l.oeopxncmi +22
zelderonmorningstar  I ese, so fi it was PKU eh onw’tdlu tujs eb enrgpisnet rfo a otuenir anaitno.exmi It luodw eb neo fo thseo o“h rcap satw’h wngro htwi my b”bay n.seo +16
wowo  90A2F1 3p8 +
nbme4unme  sutJ a eont atht dWorUl asys khpiunlnetreayo seatintp ASLO evah li,nbiams ti's tjsu htta het noeru xs nda tusym dorer are vyaaseigw. +4
pathogen7  lihle,aTycnc aislbmni is a olpmreb gpnciosres P,ODA dan ton ti,royens on? I layaws teaacosdis i"enytrso sprcngiseo dceet"f hiwt o,ocrsoishn wihch si ywh I tndid' oscoeh teri.yons eGuss 'mI no.wrg +5
cmun777  p7@gatoehn ruy'oe ont wrong ti is ysplielaicfc DPAO btu ldwou nay fo eth rhteo seawrn heiccos ekam any ssnee orev ertyi?ons +5
qiss  e@phgno7ta soal yse- uyo t'acn mkae DAOP ceeasbu fo a dvfeitece oryanisset yen.emz isTh zemeyn salo atlzesobmie otsynrie noit DOPA erebfo it mselabezoit DOPA saQ7;gMs=svpuo51RslmpVwcrhmhVxz6gc&tiH=kagFwmV=;w=-otj&EA/&crtuKQNoB1oee&oKhmU3iMz?;2/Tm8wBq1brZqia1m=amth&W7tia8LX0U.g:=waV2HKa;;jfnaCr0cDY2he1&zwixsi.j5miLyacas:s0_io9bAmphGrU;p==ppss/R3gV#m2rm7Qye2epg9oMq10B8b2s&XxdKCwe-Gl=AtAaA0panwopE;8 +

  • PKU commonly results from deficiencies in the enzyme phenylalanine hydroxylase, which converts phenylalanine to tyrosine.
  • Tyrosine, in turn, is required for synthesis of the catecholamines dopamine, norepinephrine, and epinephrine.
  • Supplementation with tyrosine effectively bypasses the defective enzyme and allows for the normal synthesis of catecholamines


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