A 4-Month-Old Boy Is Brought to the Office for His

A 4-month-old boy is brought to the office for his first visit since arriving in the United States.  The patient was recently adopted, and his adoptive mother says the boy is tremulous compared to her biological children.  Over the past week, the boy has also had episodes of upward eye deviation and bilateral arm and leg shaking for approximately 2 minutes at a time.  Biological family history is not available.  His temperature is 36.7 C (98.1 F) , blood pressure is 90/40 mm Hg, pulse is 120/min, and respirations are 30/min.  Examination shows a fair-skinned infant with blue eyes and a musty body odor.  Which of the following amino acids is most likely essential in this patient?

A) Cysteine
B) Isoleucine
C) Leucine
D) Phenylalanine
E) Tyrosine
F) Valine

Correct Answer:

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