Mutations in the GAL80 Gene in Yeast Result in the Continuous

Multiple Choice

Mutations in the GAL80 gene in yeast result in the continuous expression of the GAL1,GAL7,and GAL10 genes,even in the absence of galactose.This genetic evidence suggests that the GAL80 gene product acts as a(n)

A) transcriptional repressor.
B) promoter element.
C) enhancer element.
D) transcriptional activator.
E) RNA polymerase.