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Nucleotide
A nucleotide is a repeating unit in a DNA or RNA chain. It consists of a sugar (ribose RNA, deoxyribose DNA), which has a base attached to its 3' end and a phosphate chain attached to its 5' end.
Nucleoside
An organic molecule, consisting of a base (deoxyadenosine, deoxyguanosine, deoxycytidine, deoxythimidine) and a 2' deoxyribose.
If a posphatechain is added, it becomes a deoxynucleotide.
Purine
Adenine and Guanine
Pyrimidine
Cytosine and thymine
Adenine, A
Purine, pairs with the base Thymine in DNA and Uracil in RNA
Has the following structure:
Guanine
Purine, pairs with Cytosine.
Has the following structure:
Cytosine
Pyrimidine, pairs with Guanine
Has the follwing structure:
Thymine
Pyrimidine, pairs with Adenine. Exists only in the DNA.
Has the follwing structure:
