The GAL Gene System in Yeast Is Used to Metabolize

question 21

Multiple Choice

The GAL gene system in yeast is used to metabolize galactose.In the presence of galactose,the GAL genes are expressed; however,in the absence of galactose,the GAL genes are repressed.A yeast mutant is discovered that continuously expresses the GAL genes in the presence or absence of galactose.Which GAL gene is likely mutated?

• A)GAL3
• B)GAL4
• C)GAL1
• D)GAL 10
• E)GAL180

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