Bacteria have a single circular chromosome called a plasmid, which has a single origin of replication, and is double stranded DNA not enclosed within a nucleus (called the nucleoid region i think)
Plasmids are double stranded DNA, not single stranded. If you guys can recall DNA recombination with plasmid vectors, the restriction enzymes cuts the plasmid into sticky ends.
If you mean single as in how many present, then usually just one plasmid present in the bacteria cell.
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