The rare hereditary galactosemia involves defects in:

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Galactosemia is caused by a deficiency in one of three enzymes required to break down galactose, a sugar found in milk and dairy products. The most common form is caused by a deficiency in galactose-1-phosphate uridylyltransferase. Defects in galactokinase and UDP-glucose-4-epimerase can also lead to galactosemia, but they are much rarer. Phosphoglucomutase and UDP-glucose pyrophosphorylase are not involved in the breakdown of galactose.

The Rare Hereditary Galactosemia Involves Defects In