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.

Winston's baseball team had the bases loaded in the last inning when his friend freddie watched three straight pitches go by without swinging and was called out on strikes out to end the game. how can winston demonstrate responsible behavior in this situation? a. ask the coach sarcastically, in front of the team, if he gave freddie the take sign b. confront freddie and let him know that the team would have won if he could hit c. ignore freddie both after the game and the next day at school d. tell freddie that no one is perfect and to keep his confidence up