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  1. Plasmid - Wikipedia

    Plasmid Diagram 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 …

  2. Plasmid | DNA replication, genetic engineering, cloning | Britannica

    Plasmid, in microbiology, an extrachromosomal genetic element that occurs in many bacterial strains. Plasmids are circular deoxyribonucleic acid (DNA) molecules that replicate …

  3. What Is a Plasmid in Biology? Its Function and Uses

    Aug 23, 2025 · A plasmid is a small, circular, extra-chromosomal DNA molecule found within the cells of many microorganisms. Unlike the main chromosomal DNA, which carries the …

  4. Plasmid - National Human Genome Research Institute

    1 day ago · A plasmid is a small circular DNA molecule found in bacteria and some other microscopic organisms. Plasmids are physically separate from chromosomal DNA and …

  5. What is a Plasmid? | Ask A Biologist

    Apr 12, 2010 · A plasmid is an independent, circular, self-replicating DNA molecule that carries only a few genes. The number of plasmids in a cell generally remains constant from …

  6. plasmid / plasmids | Learn Science at Scitable - Nature

    A plasmid is a small, circular, double-stranded DNA molecule that is distinct from a cell's chromosomal DNA. Plasmids naturally exist in bacterial cells, and they also occur in some …

  7. What Is a Plasmid in Biology and How Does It Work?

    Oct 4, 2025 · Once a gene is incorporated, the recombinant plasmid can be introduced into host cells, typically bacteria, for replication. This process allows for the production of numerous …

  8. 10: Plasmids - Biology LibreTexts

    Plasmids are the workhorses of molecular biology. Plasmids are small, circular DNA molecules that replicate independently of the chromosomes in the microorganisms that harbor them. …

  9. Unraveling Plasmids: A Comprehensive Guide - CD Genomics

    What is a Plasmid? Definition of Plasmids: Plasmids are small, circular DNA molecules. They exist separately from the main DNA in cells and can copy themselves. They are predominantly …

  10. What is Plasmid DNA? Definition & Structure Explained – QIAGEN

    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 …