When you say ‘Prokaryote’, you instantly think about the most primitive forms of life that ever existed on Earth. The Prokaryote organisms are basically divided into two domains: the bacteria and the archaea. Most of them are unicellular, and they can adapt easily to any environment. This is why you can find bacteria mostly everywhere you go, not to mention that they are very resistant as well. For you to understand better this form of life, here is a Prokaryote cell diagram, which may come in very handy in the learning process.
As you can see in this cell diagram, all Prokaryote organisms are nucleus free. This is thus the main difference that you will see between a Prokaryote cell diagram and a Eukaryote one. Instead of a nucleus, you will see in this Prokaryote cell diagram a nucleoid, which may be considered as an equivalent, as it has an important part in the DNA production. Although this nucleoid is not bounded by a defined membrane, you can easily tear it apart from the other components in the Prokaryote cell diagram.
This Prokaryote cell diagram will also teach you that there are several components which are in common to the Eukaryote cell: the cell wall, which protects the cell and gives it shape; the cytoplasm, which holds the cell components, as well as enzymes and molecules; the cell membrane, or the plasma membrane, which has an important role in transportation of ions and nutrition; the ribosomes, which are protein producers.
Then, as you can see in this Prokaryote cell diagram, these organisms also have specific features, which cannot be found in the Eukaryote cell: plasmids, which are satellite DNA structures which store many important genes; the bacterial flagellum is what helps these organisms to adhere to different surfaces; pilis are hairy structures which help the cells attach to other cells; the capsule is not found in all the cells, but it is very important for the protection of bacterial cells; mesosomes, even if not shown in this Prokaryote cell diagram, are found in the plasma membrane and are important for DNA replication and excretion.