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Many genes whose expression is turned on by DNA damage have been isolated. Loss of function mutations in the lexA gene leads to expression of many of these genes, even when there has been no DNA damage. Would you hypothesize that LexA protein is a positive or negative regulator? Why?

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Given the results stated in the assignment we can deduce that lexA\textit{lexA} is a negative regulator of the genes. The reason for this is that in the absence of fully functional LexA protein protein levels of genes in question increase. Once DNA damage happens RecA protein is activated, which leads to catalytic cleavage of LexA protein, which then allows the transcription and translation of the SOS proteins in the bacterial cell.

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