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0 15 Regulation of Gene Expression Overview: Differential Expression of Genes Prokaryotes and eukaryotes alter gene expression in response to their changing environment Multicellular eukaryotes also develop and maintain multiple cell types Gene expression is often regulated at the transcription stage, but control at other stages is important, too Concept 15.1: Bacteria often respond to environmental change by regulating transcription Natural selection has favored bacteria that produce only the gene products needed by the cell A cell can regulate the production of enzymes by feedback inhibition or by gene regulation Gene expression in bacteria is controlled by a mechanism described as the operon model Regulation of gene expression Precursor trpE gene (a) Regulation of enzyme
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