Only plasmids are made of double-stranded DNA, in contrast to transposable elements.
A few proteins that the bacterial chromosome does not code for are synthesized thanks to plasmids. Transposons, also known as jumping genes, are little bits of DNA that contain enzymes that allow them to travel from one DNA site to another.
Plasmid DNA is naturally self-replicative since it contains the site of replication, whereas chromosomal DNA replicates along with the genome. For a cell to function properly and reproduce, the chromosomal DNA is necessary, but the plasmid DNA is not.
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