A Mutation in the Gene for the Yeast Regulatory Protein

question 17

Multiple Choice

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.

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