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DNA and Genes - Mecca Hosting Client Sites on rhode
DNA and Genes - Mecca Hosting Client Sites on rhode

... 7. Each set of three nitrogen basesthat .E ...
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... Epilogue In 2007, archaeologists uncovered a second burial site around 70 metres from first. It contained the burnt remains of at least two people, and analysis suggested that these were the bodies of a young boy and girl. The remains were thought to be at least sixty years old, and the presence of ...
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Biology Vocabulary 8, test on Thursday, 1/19/17

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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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