07-13-2006, 06:13 AM
A 10 yrs pt with light blond hair, pale skin, and significant mental retardation (IQ of 50) is most likely to have a defect at which biochemical pathway? Given the following interconnected pathways. Please choose only to one product and one substrate. For example: tyrosine> dopa (tyrosine becomes dopa)
Phenylalanine > tyrosine>dopa > melanin
Tyrosine>T4
Tyrosine>homogentisic acid>acetoacetic acid
Phenylalanine > tyrosine>dopa > melanin
Tyrosine>T4
Tyrosine>homogentisic acid>acetoacetic acid