Nucleotide

Nucleotides are the fundamental building bocks of DNA and RNA. They are similar to the structure of nucleosides but differ in the fact that they have a phosphate group added. The contituents of nucleotides are a base, a sugar and a phosphate group, the types of which vary between DNA and RNA. In DNA the base can be either one of the purines, adenine or guanine, or one of the pyramidines, thymine or cytosine. This is similar in RNA with the exception of one base; thymine is replaced with uracil. The sugar present in nucelotides

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