Bacteria
Bacteria are unicellular prokaryotes that can reproduce even in isolated environments and generally reproduce through the process of binary fission. Bacteria have circular double stranded DNA and unlike viruses and prions can produce their own proteins and enzymes to carry out metabolic processes.
Virus
Viruses need a host to reproduce itself. Viruses can choose to reproduce by infecting a cell then using the celll to replicate itself and going out to infect more cells. Viruses needs to use the hosts' DNA to make their own DNA.
Prions
Prions are infectious proteins that usually occur in the brain and is created when a normal brain cell is transformed into a prion. Eventually this can cause cellular malfunction and brain degeneration.
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