What characterizes prokaryotic cells?

Prokaryotic cells are primarily characterized by the absence of membrane-bound organelles and a defined nucleus. Instead, these simple cells have a nucleoid region where their genetic material, usually a single circular strand of DNA, is located. In addition to genetic material, prokaryotic cells often possess a cell wall, which provides structural support and protection.

The presence of a cell wall is a significant feature of most prokaryotes, particularly bacteria, as it helps maintain cell shape and integrity. Although some prokaryotes can lack a cell wall, this characteristic broadly describes a majority of them, making it a defining feature of prokaryotic cells.

In contrast, more complex eukaryotic cells contain membrane-bound organelles and a true nucleus. The other options reflect features that are not characteristic of prokaryotic cells, reinforcing why the presence of a cell wall is the correct answer.