Which one of these is NOT a trait of prokaryotic organisms?

Prokaryotic organisms are primarily characterized by their cellular structure, which lacks a true nucleus. Instead of a membrane-bound nucleus, prokaryotes have their genetic material located in a region called the nucleoid, which is not enclosed by a membrane. This distinguishes them from eukaryotic cells, which possess membrane-bound organelles and a defined nucleus.

The absence of a true nucleus is a fundamental trait of prokaryotes that sets them apart and is integral to understanding their cellular biology. In addition, prokaryotes usually exhibit unicellularity, meaning they are single-celled organisms, and they reproduce asexually through binary fission, which is a simple form of cell division. The other options provided accurately describe traits of prokaryotic organisms, while the presence of a nucleus is definitively not a characteristic of these organisms.