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Suppose an experimenter becomes proficient with a technique that allows her to move DNA sequences within a prokaryotic genome.
-If she moves the operator to the far end of the operon (past the transacetylase gene), which of the following would likely occur when the cell is exposed to lactose?

Question

Quizplus · Accepted Answer

Moving the operator to the far end of the operon (past the transacetylase gene) would mean that the repressor can no longer bind to it and block transcription. In the presence of lactose, the inducer would bind to the repressor, causing it to release from the operator. With the operator now downstream of the transacetylase gene, the promoter would be continuously open, allowing the genes to be transcribed continuously, even in the presence of only low levels of lactose. Therefore, the correct answer is D - the genes will be transcribed continuously.

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