If a scientist isolates genes for hepatitus b antigens from a hepatitus virus, then inserts them into a bacterial plasmid and replicates the bacteria in a fermenter,
A plasmid is a type of double-stranded, circular, tiny DNA molecule that differs from a cell's chromosomal DNA. Both bacterial and certain eukaryotic cells naturally contain plasmids. Plasmids frequently carry genes that give bacteria genetic advantages like antibiotic resistance.
While plasmids are typically circular DNA molecules, rarely they can also be linear or comprised of RNA. They may exist in single or many copies and contain anything from a few dozen and hundreds of genes. Only the host cell may allow plasmids to replicate.
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