Pyrimidine: Difference between revisions
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[[Nucleotide|Nucleotides]] can be divided into two catergories, [[Purine|purines]] and [[Pyrimidine|pyrimidines]]. [[Pyrimidine|Pyrimidines]] are named so as they are derived from the six membered ring [[Pyrimidine|pyrimidine]].<ref>Alberts et al, Molecular Biology of the Cell 5th Edition</ref> Examples of [[Pyrimidine|pyrimidines]] are [[Cytosine|cytosine]], [[Thymine|thymine]] and [[Uracil|uracil]] (which is only present in [[RNA|RNA]]). These bond via [[ | [[Nucleotide|Nucleotides]] can be divided into two catergories, [[Purine|purines]] and [[Pyrimidine|pyrimidines]]. [[Pyrimidine|Pyrimidines]] are named so as they are derived from the six membered ring [[Pyrimidine|pyrimidine]].<ref>Alberts et al, Molecular Biology of the Cell 5th Edition</ref> Examples of [[Pyrimidine|pyrimidines]] are [[Cytosine|cytosine]], [[Thymine|thymine]] and [[Uracil|uracil]] (which is only present in [[RNA|RNA]]). These bond via [[Hydrogen_bonds|hydrogen bonds]] with there complementary [[Purine|purine]] [[Base|bases]] when in [[DNA|DNA]]'s double helix form. They also exist in [[RNA|RNA]], where [[Thymine|thymine]] is replaced by [[Uracil|uracil]]. | ||
These [[Base|bases]] are only refered to as [[Nucleotide|nucleotides]] when bonded to one or more [[Phosphate|phosphate]] groups by diester bonds, when separate they are known as [[Nucleoside|nucleosides]].<ref>Stryer et al, Biochemistry 6th Edition</ref> | These [[Base|bases]] are only refered to as [[Nucleotide|nucleotides]] when bonded to one or more [[Phosphate|phosphate]] groups by diester bonds, when separate they are known as [[Nucleoside|nucleosides]].<ref>Stryer et al, Biochemistry 6th Edition</ref> | ||
Revision as of 19:03, 3 January 2011
Nucleotides can be divided into two catergories, purines and pyrimidines. Pyrimidines are named so as they are derived from the six membered ring pyrimidine.[1] Examples of pyrimidines are cytosine, thymine and uracil (which is only present in RNA). These bond via hydrogen bonds with there complementary purine bases when in DNA's double helix form. They also exist in RNA, where thymine is replaced by uracil.
These bases are only refered to as nucleotides when bonded to one or more phosphate groups by diester bonds, when separate they are known as nucleosides.[2]