Which one of the following statements concerning a one-week-old male infant with undetected classic phenylketonuria is correct?
a) tyrosine is a nonessential amino acid for the infant. b) high levels of phenylpyruvate appear in his urine. c) therapy must begin within the first year of life. d) a diet devoid of phenylalanine should be initiated immediately.

Marco is considering leaving his wife. she yells at him, throws objects against the wall, hits the dog, and tells marco that he is ugly. which factor is an indication that marco should leave right away and seek ? marco’s wife is unwilling to change. marco may be in physical danger. marco’s wife is ignoring him. marco’s friends tell him that he should leave the relationship.