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Example Questions
Example Question #1 : Catabolic Pathways And Metabolism
Phenylketonuria is a genetic disorder resulting in a lack of phenylalanine hydroxylase activity. During the first step of phenylalanine metabolism, phenylalanine is hydroxylated into what amino acid?
Possible Answers:
Serine
Alanine
Threonine
Tryptophan
Tyrosine
Correct answer:
Tyrosine
Explanation:
The first step in phenylalanine metabolism is conversion of phenylalanine to tyrosine. Tyrsoine is simply a hydroxylated version of phenylalanine.
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