Here are some key things to remember about prokaryotic cells:

* Simple structure: They are much simpler in structure than eukaryotic cells (which do have a nucleus).

* No membrane-bound organelles: They lack the complex internal structures found in eukaryotic cells, like mitochondria, Golgi apparatus, and endoplasmic reticulum.

* DNA location: Their DNA is located in a region called the nucleoid, which is not enclosed by a membrane.

* Examples: Bacteria and archaea are examples of prokaryotes.

Let me know if you'd like more details on prokaryotic cells!