What Is the Most Likely Explanation for the Light Skin

question 89

Multiple Choice

What is the most likely explanation for the light skin and hair of people with PKU?

• A) Too much phenylalanine interferes with the production of melanin.
• B) Their expression levels of the genes that produce melanin are low.
• C) They cannot adequately synthesize tyrosine, an important precursor of melanin.
• D) Melanin is broken down by excess phenylalanine.
• E) Phenylalanine interferes with the transport of melanin to the appropriate location.

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