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13. A mutation that changes a codon specifying tyrosine into a stop codon:14. When both glucose and lactose are present in anE. colicell the genes of the lac operon:a.are expressed because lactose binds to the repressor protein.b.are not expressed because lactose is blocked from entering cells, thus no allolactose can be madec.are not expressed because the terminator is activated.d. are not expressed because lactose is the preferred energy source.
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