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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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Can mnsoeeo eaxlpni yhw het nrwsea tdcuo’ln eb ipelnnaanhl?ye

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zelderonmorningstar  I ee,s os if ti saw KUP eh ’wuonltd ujst eb gerpnsteni ofr a inteuor iaitnmoeax.n tI ldwuo be eno fo hoets oh“ apcr ’thwas gnowr twhi my ybba” .snoe +16
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  • 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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