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A circular, double-stranded unit of DNA that replicates within a cell independently of the chromosomal DNA. Plasmids are most often found in bacteria and are used in recombinant DNA research to transfer genes between cells.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Genetics) a small circle of bacterial DNA that is independent of the main bacterial chromosome. Plasmids often contain genes for drug resistances and can be transmitted between bacteria of the same and different species: used in genetic engineering
[C20: from plasm + -id1]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈplæz mɪd)

a strand or loop of DNA that exists independently of the chromosome in bacteria and yeast and that is capable of genetic replication: used in recombinant DNA procedures as a vehicle of gene transfer.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.plasmid - a small cellular inclusion consisting of a ring of DNA that is not in a chromosome but is capable of autonomous replication
cellular inclusion, inclusion body, inclusion - any small intracellular body found within another (characteristic of certain diseases); "an inclusion in the cytoplasm of the cell"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
The genome of VR-MSSA has a 2,906,602-bp chromosome and 3 extrachromosomal elements, including a plasmid of 55,713 bp identical to the previously described vanA--carrying pBRZ01 (1), which also harbors aac(6')-aph(2"), which confers gentamicin resistance.
Most Bt isolates have several extrachromosomal elements, some of them circular and others linear (Carlson et al., 1994).
After an overview of the role of sex chromosomes in evolution and human diseases, research chapters cover topics such as the role of extrachromosomal elements in human leukemia cells, and alternative splicing transcripts affected by junction tandem repeats in the human genome.

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