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Kaplan Qbank USMLE



Author4 Posts
  #1

name all the vitamin and mineral cofactors for the respective enzymes in the following reaction.

Tyrosine----(1.Tyrosine Hydroxylase)----> L-Dopa ----(2.Dopa Decarboxylase)----> Dopamine ----(3.Dopamine beta-Hydroxylase)---> N.E.----(4.PNMT)----> Epinephrine


  #2

[Good Classic q and Hi Yeild drk1980, dont see why the others didnt jump on it] #1)BH4----could be defiicent in variants of PKU. #2) Vitamin B6 #3 Cu++ and Vitamin C 4)SAM

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  #3

PKU?? thts phenylalanine hydroxylase i think!!

  #4

could u pls elaborate on ur ans for the 1st one mjl1717.ok with the cofactor but why is it different in pku?anything to do with the fact that tyrosine is derived from phenylalanine?

thnx







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