Phenylketonuria Is Caused by

question 6

Multiple Choice

Phenylketonuria is caused by

• A) an inherited lack of an enzyme that produces tyrosine.
• B) accumulation of waste products in the brain.
• C) neurofibrillary tangles.
• D) toxic chemicals released by a virus.
• E) leakage from glutamate into the brain blood system.

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