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

question 25

Multiple Choice

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

• A)The enzymatic degradation of phenylalanine requires the biopterin cofactor.
• B)Individuals with defects in phenylalanine catabolism require tyrosine in their diet.
• C)An inability to hydroxylate phenylalanine results in increased blood levels of phenylalanine,causing mental retardation.
• D)A and C
• E)A,B,and C

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