Why are fetuses with PKU usually symptom-free?
A) The organs affected by phenylalanine have not yet developed.
B) There is a fetal enzyme that metabolizes phenylalanine.
C) The mother's blood has the enzyme that metabolizes phenylalanine.
D) Mothers typically eat foods low in phenylalanine.
E) Phenylalanine quickly breaks down in fetal blood.
Correct Answer:
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