Thymine vs Uracil The nucleic acids contain chains of nucleotides. Each nucleotide comprises a nitrogenous base, a pentose sugar and a phosphate group. Nitrogenous bases make the backbone of the nucleic acids. Nitrogenous bases are mainly divided into two types; (a) pyrimidines, which include cytosine, uracil and thymine, and (b) purines, which include adenine […]