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The operon concept, first described by Jacob and Monod in prokaryotes, refers to a cluster of structural genes under the control of a single promoter and regulatory elements, allowing coordinated transcription. In prokaryotes like *E. coli*, operons such as the lac operon facilitate rapid adaptation to environmental changes by turning on or off multiple genes simultaneously. However, in eukaryotes, the operon model is largely inapplicable due to the structural and functional complexity of eukaryotic __________ _____ ___ _______ ______ ________ ____ _________ ____ ____ _____.
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