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plasmid    
质粒

质粒

plasmid
n 1: a small cellular inclusion consisting of a ring of DNA that
is not in a chromosome but is capable of autonomous
replication [synonym: {plasmid}, {plasmid DNA}]

Plasmid \Plas"mid\, n. (Molecular genetics)
A piece of DNA, usually circular, functioning as part of the
genetic material of a cell, not integrated with the
chromosome and replicating independently of the chromosome,
but transferred, like the chromosome, to subsequent
generations of daughter cells. In bacteria, plasmids often
carry the genes for antibiotic resistance; they are exploited
in genetic engineering as the vehicles for introduction of
extraneous DNA into cells, to alter the genetic makeup of the
cell. The cells thus altered may produce desirable proteins
which are extracted and used; in the case of genetically
altered plant cells, the altered cells may grow into complete
plants with changed properties, as for example, increased
resistance to disease.
[PJC]


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  • 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 from chromosomal DNA and can replicate independently
  • Plasmid - Definition, Types and Functions | Biology Dictionary
    A plasmid is a small, circular piece of DNA that is different than the chromosomal DNA, which is all the genetic material found in an organism’s chromosomes It replicates independently of chromosomal DNA
  • Plasmids 101: What is a plasmid? - Addgene
    What is a plasmid? At their most basic level, plasmids are small circular pieces of DNA that replicate independently from the host's chromosomal DNA They are mainly found in bacteria, but also exist naturally in archaea and eukaryotes such as yeast and plants
  • Plasmid - National Human Genome Research Institute
    A plasmid is a small circular DNA molecule found in bacteria and some other microscopic organisms Plasmids are physically separate from chromosomal DNA and replicate independently
  • 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 independently of the bacterial chromosome
  • What is a Plasmid? | Ask A Biologist
    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 generation to generation
  • Plasmids- Definition, Properties, Structure, Types, Functions, Examples
    What are Plasmids? Plasmids are small circular DNA fragments, double-stranded, self-replicating extra chromosomal structures found in many microorganisms The term Plasmid was coined by Joshua Lederberg in 1952 Plasmids are important as genetic tools, which are used to introduce, manipulate or delete certain genes from the host cell
  • 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 eukaryotes
  • What is a plasmid? What Every Life Scientist Should Know.
    In this guide, we will tell you what is a plasmid by breaking down the essential concepts every life scientist should know, from plasmid anatomy to system-specific considerations Plasmids are small, circular DNA molecules that replicate independently from chromosomal DNA, primarily found in bacteria
  • Plasmids: Structure, Types, and Their Role in Gene Transfer
    The backbone of a plasmid consists of several key elements that facilitate its replication and maintenance One of the most important components is the origin of replication (ori), a specific sequence where the replication process initiates





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