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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 nemoseo lpnxiae ywh teh ransew nocutld’ eb inlaen?apyhlne

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donutsnduodenums  eTh ikd has inal,imbs chhwi si eud ot radeeedcs onistyeras ctit.yvai If he hsa a pbolrem zingmbailteo yealnhle,aPnin he lowdu eb netsrgienp with teh UPK xs leik alueitencltl ltiibsdyia, tmysu body d,roo ,c.te in dianodit ot sih rfai inmel.oopxc +22
zelderonmorningstar  I ,ees os fi it swa PUK eh ulotn’wd stuj eb inenrgpest orf a eunotri tix.imnaaneo It dulwo eb oen fo hoest “ho rpca ’thswa wrngo tihw ym ba”by .enos +16
wowo  01A2F9 3p8 +
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pathogen7  ciya,cenTlhl masibnil is a bemlpor gcsripsnoe ,ODAP adn ont osyrient, o?n I ylawas asoeistcad nioesr"yt oecgpsnrsi te"dfce with iroshsoocn, wcihh si yhw I i'tndd ocehos niotsy.er sseuG 'Im ownr.g +5
cmun777  tgnoae7h@p ou'yer ton rwgon it si leyfasclipci OPAD tub lduow yna of hte rehto rsewan sicheoc aemk nya neses rvoe ?nsrtoeyi +5
qiss  gnta7epho@ lsoa ye-s ouy a'ctn emka DAOP aceeubs fo a eefdevtci aeitsronys e.eyzmn This nemzye soal eebzsoalitm insytero onti ADOP eoefbr ti iebozatesml AOPD ZwrK7_?om;r2paqueABKUtwaVx;Mas8o1g0mehz1=pA;=&29l&YbLGp-.npVtiweRaUwh=u;gMm1mssostoh5Xr&pkT20s8tthsa3&8Vi=pi/hQE9=XBgcmfypqAbGjaQHpVgFa3zipAo5:c=rlW/soi=aj;NK&iE6-rm.z1b;hmcRc:sHsmj1=0mmBmnd1LoD2cweo2erCyww0Ciq0vUxw2&x&ai8VaQ7t;K#s7gge=M/Aaa +

  • 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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