Here are some key points about prokaryotes:

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

* Single-celled organisms: All prokaryotes are single-celled organisms, also known as unicellular organisms.

* Examples: Bacteria and archaea are the two main groups of prokaryotes.

* DNA location: While they don't have a nucleus, prokaryotes do have DNA. Their DNA is located in a region called the nucleoid, which is not enclosed by a membrane.

* Other features: Prokaryotes also lack other membrane-bound organelles that eukaryotic cells have, such as mitochondria, Golgi apparatus, and endoplasmic reticulum.

Let me know if you have any other questions!