Phenylketonuria (PKU):
A. involves an inability to metabolize phenylalanine, an amino acid.
B. can lead to IQ levels between 75 and 100.
C. helps the individual develop resistance against brain damage.
D. is not a genetically transmitted and occurs in about 50 in 1,000 births.
Answer: A
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The best method of controlling for retrospective reports is to:
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