Mitochondria evolved from a parasite bacteria, they lost most of their DNA and can't live outside the cell and encode their replication. The difference is that

Mitochondria evolved from a parasite bacteria, they lost most of their DNA and can't live outside the cell and encode their replication. The difference is that Mitochondria are very useful, but this look like a very nasty parasite. This is clearly a archea, not a virus.