In the accompanying image, a nucleotide is indicated by the letter B in the double stranded DNA structure.
Nucleotide refers to the molecule consisting of a nitrogen containing base, a phosphate group, and a sugar. The nitrogenous bases are adenine, guanine, cytosine and thymine in DNA (deoxyribose nucleic acid) molecule. In RNA (ribonucleic acid), thymine is replaced with uracil. These molecule pair together according to Chargaff's rule. Nucleotides are considered as the building block of DNA and RNA. They are responsible for functions such as the cell signaling, metabolism, and enzyme reactions. Nucleotides are synthesized from small molecules and amino acids and carry huge importance in nucleobases and nucleosides.
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