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68006 Biochemistry

A 2-month-old, breast-fed baby that was normal at bih begins to develop gastrointestinal problems and cirrhosis of the liver. Molecular analysis indicates a normal amount of galactose-1-phosphate uridyl transferase (GALT) mRNA, but no observable enzyme activity. Which of the following would be the best possible explanation for this?

AGene deletion
BNonsense mutation
CPremature transcription termination sequence in the DNA
DPromoter mutation
Biochemistry
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