Predict and explain the effect on GAL1 transcription, in the presence of galactose alone, of the following mutations:
a. Deletion of all four Gal4-binding sites in the GAL1 UAS element.
b. Deletion of the Gal4 activation domain.
c. Deletion of the GAL80 gene.
d. Deletion of the GAL1 promoter.
e. Deletion of the GAL3 gene.