Yes they are - yet they are not the only examples.
prokaryotes
Prokaryotes
No. A prokaryote is a single cell.
A prokaryote contains a single circular chromosome in its cytoplasm.
Prokaryotes.
They are known as Prokaryotes.
Single-celled organisms that do not have organized nuclei are called prokaryotes. These organisms are simple in structure and lack a membrane-bound nucleus. Examples of prokaryotes include bacteria and archaea.
Prokaryotes
Prokaryotes don't have a nucleus - their DNA is floating free in the cell cytoplasm. in other words they lack a Nucleus
According to evolution, prokaryotes were the first cells on Earth. (Prokaryotes are single-celled organisms that don't have a nucleus, if you didn't know that.)
it is called a eukaryote
Yes, most prokaryotes have cell walls.