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An operon is a functional unit of DNA that contains a cluster of genes under the control of a single promoter. It plays a crucial role in the regulation of gene expression in prokaryotes, primarily in bacteria, where multiple genes involved in the same metabolic pathway or process are transcribed together into a single messenger RNA (mRNA) molecule. This allows for coordinated regulation, ensuring that all related enzymes or proteins are produced simultaneously when needed. The structure of an operon typically includes several key components. The promoter is the DNA sequence that serves as ______ _______ ____ ___ _______ ____ ______ ________ _________.
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