Which of the following statements about phenylalanine is(are)TRUE?

Question

Quizplus · Accepted Answer

Statement A is true, as the enzymatic degradation of phenylalanine requires the biopterin cofactor.
Statement B is also true, as individuals with defects in phenylalanine catabolism require tyrosine in their diet since their bodies cannot convert phenylalanine to tyrosine.
Statement C is true, as an inability to hydroxylate phenylalanine (due to a genetic disorder called phenylketonuria) results in increased blood levels of phenylalanine, which can cause mental retardation.

Which of the Following Statements About Phenylalanine Is(are)TRUE