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Watson and Crick describe structure of DNA1953. Photo: Model of DNA molecule. In the late nineteenth century, a German biochemist found the nucleic acids, long-chain polymers of nucleotides, were made up of sugar, phosphoric acid, and several nitrogen-containing bases.Later it was found that the sugar in nucleic acid can be ribose or deoxyribose, giving two forms: RNA and DNA.atson and Crick describe structure of DNA1953. Photo: Model of DNA molecule. In the late nineteenth century, a German biochemist found the nucleic acids, long-chain polymers of nucleotides, were made up of sugar, phosphoric acid, and several nitrogen-containing bases.
A nucleotide is a monomer of a nucleic acid consisting of 3 parts. These 3 parts include a pentose sugar, a phosphate group, and a nitrogenous base.The nitrogenous bases include purines (adenine and guanine) and pyrimidines (cytosine and thymine).Sugar, phosphate group, and a nitrogen base(base pair).There are also some exotic, artificial nucleotides with different types of sugars with different numbers of carbon atoms and/or different functional groups.ucleotides are molecules consists of three parts-a nitrogen base, a five-carbon sugar and a phosphate group. DNA and RNA are made of the subunits called nucleotides. 3 people found this useful.