There isn't a "modern version" of prokaryote cells. Prokaryotes are a fundamental and ancient type of cell, distinct from eukaryotes, and they continue to exist in their basic form today.

Here's why:

* Evolutionary History: Prokaryotes were the first life forms on Earth, existing for billions of years before eukaryotes emerged. They are incredibly diverse and successful.

* Basic Structure: Prokaryotes are defined by their simple structure: lacking a nucleus and membrane-bound organelles. This basic design has proven incredibly effective for survival.

* Adaptability: Prokaryotes have evolved diverse adaptations for survival in nearly every environment on Earth, from boiling hot springs to extreme cold.

While prokaryotes are still considered "primitive" in terms of their complexity, they are far from outdated or obsolete. They continue to thrive and evolve, playing crucial roles in ecosystems and even contributing to the development of new technologies.