USMLE Step 1 Quiz
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BIOCHEMISTRY
Question 1 of 20
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An 8-month-old infant is brought to the pediatrician for evaluation. The parents report that since they started introducing fruits and juices into his diet, he has had episodes of vomiting, irritability, and poor feeding. Physical examination reveals jaundice and hepatomegaly. Laboratory studies show hypoglycemia, hyperbilirubinemia, and elevated liver transaminases. The condition is known to be caused by the trapping of phosphate within a toxic metabolite.
A deficiency in which of the following enzymes is the most likely cause of this infant's condition?
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