A) no phenylalanine and no tyrosine
B) low phenylalanine and normal requirement of tyrosine
C) normal recommended amount of phenylalanine
D) normal recommended amount of both phenylalanine and tyrosine
Correct Answer: B
Solution :
Phenylketonuria (PKU) is a disease caused by the livers inability to produce a particular type of phenylalanine hydroxylase (PAH) enzyme. This enzyme converts the amino acid phenylalanine into tyrosine. A lack of PAH causes buildup of abnormally high phenylalanine concentrations in the blood and brain. The typical diet prescribed for PKU patients is very small amount of phenylalanine and higher quantity of tyrosine.
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