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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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aCn mnesooe lpeaxin yhw the narwse on’dtclu be l?einpeyaahlnn

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donutsnduodenums  ehT kid sha mai,bnsil hichw is eud ot rceedesda esynaoisrt icav.tyit If eh ahs a rolmepb iiomabeglztn yeilan,lnanhPe he ldouw be ntrespigne wthi hte UPK xs lkei antuitelecll i,tibdsylai smtyu odby do,or .tce, in dinaiodt ot ish iafr neopxo.mcli +22
zelderonmorningstar  I ees, so fi it aws PKU he wl’undot utjs eb ipnregnest for a rntoiue xomtan.neiai tI wloud eb one fo etosh oh“ pcra aswht’ onrgw wthi ym ”aybb .oens +16
wowo  F192A0 8p3 +
nbme4unme  ustJ a noet atht UdWrlo says rnontihlukepaey piatnest OLAS eavh la,msbini ts'i utsj ttah het roeun sx adn ymust reodr aer esvwyigaa. +4
pathogen7  cecniTyllah, basinlim si a ormlebp ienpgcsors APO,D nda ont rnso,eity no? I alsyaw iasctdesoa etoryi"ns cgniospsre efdce"t whti hcoorossni, iwhch is ywh I indt'd eoscoh .yesnirto seuGs m'I w.grno +5
cmun777  oahtpn7e@g e'your not norwg it si yicfisaclelp AODP tub dlowu yan fo the rtoeh arwnes hcisoec amek ayn sesne veor ?sirentoy +5
qiss  hatngpe@7o sola sey- you atnc' kaem APDO saeecub of a dveftceie oyerissant meezy.n ihsT yenzme aosl meiazbeoslt etrnsiyo iton DAOP feebro ti selabetmzio OPAD AA;iwUE8czqpXobwAec=nhRK1VwgimaoeiB7CmwTkv1otam=3l1W=NzV5oFoaQ&===jpVmaQoosq=i;waymMphyM2ia0-7bsLsw7ppdHGaXestc-pieaqmrsBegK&jr=21Ls&ap8m2Utrm2:mKrua;tfh?5eY/cRwr;ho01srlMBG_g0w&2u#3mV;8bz6&xQhc/V0&1m/CnHtZs=Ag.UaK2:iapsi&;;E.h8gsAtg0D9xxp9j +

  • 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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