_____ is the disorder of infancy characterized by failure to produce an enzyme necessary for the breakdown of a specific amino acid in the body.
A) Down syndrome
B) Fragile X syndrome
C) Phenylketonuria
D) Tay-Sachs disease

Question

Quizplus · Accepted Answer

Phenylketonuria (PKU) is a genetic disorder in which an individual is unable to produce the enzyme phenylalanine hydroxylase, which is necessary for the breakdown of the amino acid phenylalanine. This leads to a buildup of phenylalanine in the body, which can cause damage to the central nervous system if not treated early. Down syndrome and Fragile X syndrome are genetic disorders, but they do not involve issues with amino acid breakdown. Tay-Sachs disease is a disorder in which the body cannot break down certain fatty substances, and is not related to amino acids.

_____ Is the Disorder of Infancy Characterized by Failure to Produce