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.

Question

Quizplus · Accepted Answer

The fact that mutations in the GAL80 gene lead to continuous expression of the GAL1, GAL7, and GAL10 genes, even without the presence of galactose, suggests that the GAL80 gene product normally acts as a transcriptional repressor, suppressing expression of these genes in the absence of galactose.

Mutations in the GAL80 Gene in Yeast Result in the Continuous