Definition of plasmid in English:

plasmid

Syllabification: plas·mid
Pronunciation: /ˈplazmid
 
/

noun

Biology
  • A genetic structure in a cell that can replicate independently of the chromosomes, typically a small circular DNA strand in the cytoplasm of a bacterium or protozoan. Plasmids are much used in the laboratory manipulation of genes. Compare with episome.
    More example sentences
    • The bacterium contains a plasmid, a circular piece of DNA that holds the gene and promoter sequence.
    • The replication control genes of bacterial plasmids face selection at two conflicting levels.
    • We note, however, that few if any of the genes borne by bacterial plasmids are under strong positive selection at all times.

Origin

1950s: from plasma + -id2.

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