Plasmid

Plasmids are (typically) circular double-stranded DNA molecules that are separate from the chromosomal DNA (Fig. 1). They usually occur in bacteria, sometimes in eukaryotic organisms (e.g., the 2-micrometre-ring in Saccharomyces cerevisiae). Their size varies from 1 to over 400 kilobase pairs (kbp). There are from one copy, for large plasmids, to hundreds of copies of the same plasmid present in a single cell.

Related Topics:
DNA - Bacteria - Eukaryotic organisms - Saccharomyces cerevisiae - Kilobase pair - Cell

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