Final answer:
Genes in prokaryotes are organized in operons, which facilitate efficient and coordinated regulation of gene expression, allowing responses to environmental changes.
Step-by-step explanation:
Since genes are arranged in operons in prokaryotes, it allows for efficient regulation of gene expression. Groups of related genes are organized into operons, enabling coordination and simultaneous control of their expression. For example, in E. coli, all the genes needed to metabolize lactose are part of the LAC operon, and are transcribed into one mRNA. An operon typically includes a promoter, where RNA polymerase binds, and an operator, a regulatory sequence where proteins such as repressors can bind to regulate transcription.Operons can be inducible, activated in response to a substrate (e.g., the LAC operon becomes active in the presence of lactose), or repressible, turned off in response to a product (e.g., the trp operon is repressed in the presence of tryptophan). Operons ensure that prokaryotes efficiently adapt to environmental changes by controlling transcription of groups of functionally related genes.