A mutation in the gene for the yeast regulatory protein GAL4 causes yeast to grow poorly on galactose. What is the function of GAL4?
A) It is a substrate that binds and activates a transcriptional activator.
B) It is a product that binds and activates a transcriptional repressor.
C) It is a transcriptional activator for the galactose-digesting enzyme gene.
D) It is a transcriptional repressor that prevents expression of yeast galactose-digesting enzymes.
E) It is an enzyme that metabolizes galactose.

Question

Quizplus · Accepted Answer

GAL4 is a transcriptional activator that binds to specific DNA sequences to promote the expression of genes involved in galactose metabolism in yeast.

A Mutation in the Gene for the Yeast Regulatory Protein