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2 gru 2014 · I am studying nitrogen bases and their structures and roles in nucleotide, polynucleotides and nucleic acids formation. In the structures of the nitrogen bases like Adenine, Guanine, Cytosine and Thymine, the numbering is baffling me. Why are the atoms in these molecules numbered so?
IUPAC codes are used in bioinformatics to represent nucleotide sequences, including adenine, cytosine, guanine, thymine (or uracil), and other ambiguous bases.
Nucleotide Numbering. The nucleotides are shown with standard numbering convention. The aromatic base atoms are numbered 1 through 9 for purines and 1 through 6 for pyrimidines. The ribose sugar is numbered 1' through 5'.
Nucleotide bases [1] (also nucleobases, nitrogenous bases) are nitrogen-containing biological compounds that form nucleosides, which, in turn, are components of nucleotides, with all of these monomers constituting the basic building blocks of nucleic acids.
17 kwi 2015 · A nucleotide has three characteristic parts: (A) A nitrogenous or nitrogen-containing organic base, (B) a pentose or five-carbon sugar molecule, and (C) a phosphate group. Bases and pentoses are heterocyclic compounds.
A nucleotide is composed of a nitrogenous base, deoxyribose (five-carbon sugar), and at least one phosphate group. The nitrogenous bases are purines such as adenine (A) and guanine (G), or pyrimidines such as cytosine (C), thymine (T), and uracil (U).
DNA and RNA nucleotide building blocks contain three components: a heterocyclic base, a pentose sugar, and a phosphate. For the first two components, a precise numbering and nomenclature system is needed to communicate a universally distinct chemical structure and name.
