Bacteria are some of the best examples of prokaryotic organisms. These organisms do not have a membrane-bound nucleus and lack the well-distinguished cell features found in eukaryotes. More »

A unicellular organism is any life form that is composed of a single cell; they live and carry out all life processes as a single cell. Based on their complexity, unicellular organisms can be placed in one of two categor... More »

All bacteria are classified as prokaryotes, and common examples include E. coli and Streptococcus. Archaea, which has similarities to bacteria, is another domain that exclusively features prokaryotes. Prokaryotes are sin... More »

Bacteria are prokaryotic cells, which are characterized by a lack of a membrane-bound nucleus. They are typically simpler than eukaryotic cells, which have a membrane-bound nucleus and organelles responsible for cell fun... More »

The only organisms with prokaryotic cells belong to the domains Bacteria and Archaea. These organisms are considered to be prokaryotes, which are characterized by being cells that do not possess a distinct nucleus. More »

Bacteria are single-celled organisms that reproduce by cell division, while viruses are not cells and are incapable of reproducing on their own. Viruses must invade other cells and use the cells' machinery to reproduce t... More »

Bacteria are simple organisms that are found in every type of environment, including on land, in the air, in water and on and inside plants and animals. A bacterium (or single bacteria) is a single-celled creature that c... More »