How does an operon typically function in prokaryotes?

• A. By regulating a single gene
• B. By coordinating the expression of multiple genes
• C. By producing non-coding RNA
• D. By promoting transcription termination

Answer: (B)

An operon typically functions in prokaryotes by coordinating the expression of multiple genes. This arrangement allows a group of genes that encode proteins with related functions to be regulated as a single unit. The genes within an operon are often involved in a specific metabolic pathway or cellular process, enabling the bacterium to efficiently control the expression of those genes in response to environmental changes.

For example, when a certain substrate is present, the operon can be activated to produce the necessary enzymes for its metabolism. This coordinated response ensures that all relevant proteins are produced simultaneously, which is essential for efficient cellular functioning and resource management in prokaryotic organisms.