Which statement about prokaryotic cells is true?

Prokaryotic cells are characterized by their simpler structure compared to eukaryotic cells. One of the key features of prokaryotic cells is that they often contain operons, which are groups of genes that are regulated together. This arrangement allows for efficient regulation of gene expression in response to environmental changes. Operons enable prokaryotic cells to coordinate the production of proteins that are required for specific functions, making them highly adaptable. This is particularly important for prokaryotes as they often inhabit varying environments and need to respond quickly to changes.

In contrast, the other statements do not accurately represent the characteristics of prokaryotic cells. They lack membrane-bound organelles and a defined nucleus, and they reproduce primarily through binary fission rather than mitosis. Understanding these features helps clarify the distinction between prokaryotic and eukaryotic cells.