What's the difference between a plasmid from a prion?

Benefit provided: A plasmid is a small, self-replicating segment of bacterial dna (chromosome) that exists only within a cell and are usually of benefit to the bacteria. A prion is a protein that is considered infectious, specifically increasing the number of proteins that become like itself: they can convert proteins to prion status.

Not even close: A plasmid is a bit of dna that one microbe donates to another. A prion is a protein that transforms host proteins into copies of itself. Basic biology. Little is learned from "compare and contrast." good luck with your studies.