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Plasmid. Illustration of a bacterium showing chromosomal DNA and plasmids (Not to scale) 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 ...
Dec 24, 2022 · The term plasmid was first introduced by the American molecular biologist Joshua Lederberg in 1952. A plasmid is a DNA molecule that is separate from, and can replicate independently of the chromosomal DNA. They are double-stranded and, in many cases, circular. Plasmids usually occur naturally in bacteria, but are sometimes found in archaea ...
A plasmid is a closed circular molecule of double-stranded DNA that range in size from 1 to >200 kb. Plasmids are found in various bacterial species, where they behave as additional genetic units inherited and replicated independently of the bacterial chromosome. However, they rely upon enzymes and proteins provided by the host for their ...
Mar 31, 2015 · The relationships between the phyla of plasmid hosts and plasmid size or GC content are shown in Figures 1B,C. The bimodal distribution of plasmid sizes was plotted as previously shown (Smillie et al., 2010 ; Garcillán-Barcia et al., 2011 ) with peaks at approximately 4–8 kb and 32 kb, whereas the number of sequenced plasmids increased from ...
- Masaki Shintani, Zoe K. Sanchez, Kazuhide Kimbara
- 10.3389/fmicb.2015.00242
- 2015
- Front Microbiol. 2015; 6: 242.
Jul 28, 2023 · The capacity for conjugation is connected to two other biologically relevant properties: plasmid size and the number of copies of the plasmid maintained in a host cell. In general, conjugative plasmids are large and have a low copy number (typically one or a few copies per cell), while small plasmids, which tend to have a high copy number, are ...
- Ian Dewan, Hildegard Uecker
- Microbiology (Reading). 2023; 169(7): 001362.
- 10.1099/mic.0.001362
- 2023
Dec 29, 2023 · Plasmids are extra-chromosomal genetic elements that replicate independently. They are small, circular (some are linear), double-stranded DNA molecules (mostly) that exist in bacterial cells and some eukaryotes. The sizes of plasmids range from roughly one to more than 1000 kilobase pairs. A typical plasmid is a circular, double-stranded DNA ...
Jan 19, 2021 · Plasmid prevalence and types. Plasmids are remarkably diverse. Plasmids differ in size, copy number, G + C content, replication mechanism, transmission mode, DNA topology (that is, circular or ...
