Suppose that a mutant form of GAL80 protein lacks the domain that binds to GAL4 protein. Yeast cells with this mutant GAL80 will:
a. never activate the genes needed for galactose metabolism.
b. always repress the genes needed for galactose metabolism even in the presence of galactose.
c. always activate the genes needed for galactose metabolism even in the absence of galactose.
d. have the minimal (basal) level of transcription of genes for galactose metabolism.
