Bacteria
Bacteria are unicellular prokaryote that able to reproducing even under an isolated environment. Bacteria have circular double stranded DNA. Bacteria usually reproduce by binary fission, meaning a bacterium reproduce by making exact copies of itself by replicating its DNA. However, some bacteria can reproduce using other methods. Unlike viruses and prions, bacteria have ribosomes allowing them to produce their own proteins and enzymes to carry other metabolic processes. Some bacteria are considered pathogens by the toxins they secrete during metaloblism.
Virus
A virus is something that live in between the living and non-living. Like prions, the virus needs a host to reproduce itself. The viruses can choose to reproduce by infecting a cell and use the cell to make more replicas of itself then invade other cells. The virus lack ribosomes so it needs to use the hosts' DNA to make their own DNA.
Prions
Prions are infectious proteins. Prions usually occur in the brain and converts a normal cell into a prion. Prions would convert normal brain cells into prion cells until prions build up and cause cellular malfunction and brain degeneration. Prions are not truly living and does not function like a virus or a bacteria simply because it is a form of protein.
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