[Answer] plasmids

Answer: extrachromosomal, autonomous, self-replicating circular DNA pieces
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A plasmid is a small often circular DNA molecule found in bacteria and other cells. Plasmids are separate from the bacterial chromosome and replicate independently of it. They generally carry only a small number of genes notably some associated with antibiotic resistance. Plasmids may be passed between different bacterial cells.
Plasmids . A plasmid is an independent circular self-replicating DNA molecule that carries only a few genes. The number of plasmids in a cell generally remains constant from generation to generation. Plasmids are autonomous molecules and exist in cells as extrachromosomal genomes although some plasmids can be inserted into a bacterial …
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Plasmids are small circular molecules of double-stranded DNA derived from larger plasmids that occur naturally in bacteria. 68 Most plasmid-cloning vectors are designed to replicate in E. coli. 69 All of the enzymes required for replication of the plasmid DNA are produced by a host bacterium.
A plasmid is a small extrachromosomal DNA molecule within a cell that is physically separated from chromosomal DNA and can replicate independently. They are most commonly found as small circular double-stranded DNA molecules in bacteria; however plasmids are sometimes present in archaea and eukaryotic organisms.
The size of plasmids varies enormously. The F-plasmid of Escherichia coli is fairly average in this respect and is about 1% the size of the E. coli chromosome. Most multicopy plasmids are much smaller (ColE plasmids are about 10% the size of the F-plasmid).
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A plasmid is a small circular …

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