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The DNA connection - Somerset Academy North Las Vegas
The DNA connection - Somerset Academy North Las Vegas

...  The order of the nitrogen bases along a gene forms a genetic code that specifies what type of protein will be produced.  Example: CGT, always codes for the amino acid alanine. ...
Biotechnology Free Response Questions part II
Biotechnology Free Response Questions part II

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... - DNA fragments may be combined with bacterial DNA so they can be reentered into a bacterium. - The plasmids are removed and cut with the same restriction enzyme used to produce the DNa fragments. - The cuts leave sticky ends which are then joined together to complete the ring. DNA Insertion - The D ...
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Bulletin 1 - DNA: The Cookbook of Life - ctahr

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AP BIO Unit 6 Review Ch. 14,15,16,18,19 Westbrook Gene

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Pre-AP Biology 2009
Pre-AP Biology 2009

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Extrachromosomal DNA



Extrachromosomal DNA is any DNA that is found outside of the nucleus of a cell. It is also referred to as extranuclear DNA or cytoplasmic DNA. Most DNA in an individual genome is found in chromosomes but DNA found outside of the nucleus also serves important biological functions.In prokaryotes, nonviral extrachromosomal DNA is primarily found in plasmids whereas in eukaryotes extrachromosomal DNA is primarily found in organelles. Mitochondrial DNA is a main source of this extrachromosomal DNA in eukaryotes. Extrachromosomal DNA is often used in research of replication because it is easy to identify and isolate.Extrachromosomal DNA was found to be structurally different from nuclear DNA. Cytoplasmic DNA is less methylated than DNA found within the nucleus. It was also confirmed that the sequences of cytoplasmic DNA was different from nuclear DNA in the same organism, showing that cytoplasmic DNAs are not simply fragments of nuclear DNA.In addition to DNA found outside of the nucleus in cells, infection of viral genomes also provides an example of extrachromosomal DNA.
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