Consider the Regulation of Galactose Metabolism Through GAL4

question 6

Multiple Choice

Consider the regulation of galactose metabolism through GAL4. Which of the following would result from a mutation that allowed GAL3 to bind to GAL80 in the absence of galactose?

• A) Transcription of the genes involved in galactose metabolism would occur both in the presence and in the absence of galactose.
• B) GAL80 would be able to bind to GAL4, and transcription of the genes involved in galactose metabolism would be repressed.
• C) GAL4 would no longer be able to bind to the DNA; thus, transcription of the genes involved in galactose metabolism would occur.
• D) GAL80 would no longer be able to stimulate transcription of the genes involved in galactose metabolism.
• E) There would be no change in the regulation of galactose metabolism because GAL3 normally binds to GAL80 to cause a conformation change in GAL80.

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