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what is a pyrimidne and a purine as related to DNA

asked in DNA, science



siasl74 answers:

3 pyramadines derivatives form the bases cytosine, thymine, and uracil. These bases form hydrogen bonds with their complementary purines. Thus the purines adenine (A) and guanine (G) pair up with the pyrimidines thymine (T) and cytosine (C)

See the wiki for more:
http://en.wikipedia.org/wiki/Pyrimidine


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seacommander answers:

DNA is a double helix of adenine:thymine pairs and guanine:cytosine pairs all attached to a sugar phosphate backbone. Adenine, thymine, guanine and cytosine are termed nucleotides. The order of the pairs along the DNA strand is very precise and composes the genes that determine the structure and the individual features of each and every manifestation of life from bacterium to human being.

http://www.accessexcellence.org/RC/VL/GG/structure.php

The length of the DNA molecules in a human being is absolutely amazing: in a cell the DNA, if fully extended, would have a total length of 1.7 metres. If you unwrap all the DNA you have in all your cells, you could reach the moon ...6000 times!

http://www.rothamsted.bbsrc.ac.uk/notebook/courses/guide/dnast.htm

Uracil can take the place of thymine in RNA and only occurs as a breakdown product of cytosine in DNA.

http://en.wikipedia.org/wiki/DNA


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