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GAL4 null mutants express the GAL1, 2, 7 & 10 genes A. never whether galactose is absent or present B. constitutively whether

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Answer #1

Gal repressor activity is regulated by the level of D galactose in the cell. Increased galactose levels inhibit the repressor's activity by binding allosterically, resulting in a conformational protein modification that suppresses its interactions with RNA polymerase and DNA. This induces the activity of operon by improvin the metabolism rate for galactose, by transcribing the necessary genes.

Thus, the correct answer is option C.

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