Twenty-Five Years Ago,when Oshima and Colleagues Discovered That a Mutation

question 35

Multiple Choice

Twenty-five years ago,when Oshima and colleagues discovered that a mutation in the GAL4 gene led to the inability to synthesize all five enzymes required for galactose catabolism (breakdown) ,they couldn't be blamed for wanting to apply a bacterial model to explain this finding.What they expected,but did not find,was _____.

• A)for all five genes to constitute an operon
• B)five widely separated genes,each containing a GAL4 binding site in its regulatory region
• C)for chromatin decondensation to play an important role in regulating the genes of galactose catabolism
• D)for transcription to be important in regulating the genes of galactose catabolism

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