<Li> 5 - carbon sugar which is called deoxyribose (found in DNA) and ribose (found in RNA). </Li> <Li> One or more phosphate groups . </Li> <P> The nitrogen bases adenine and guanine are purine in structure and form a glycosidic bond between their 9 nitrogen and the 1' - OH group of the deoxyribose . Cytosine, thymine and uracil are pyrimidines, hence the glycosidic bonds forms between their 1 nitrogen and the 1' - OH of the deoxyribose . For both the purine and pyrimidine bases, the phosphate group forms a bond with the deoxyribose sugar through an ester bond between one of its negatively charged oxygen groups and the 5' - OH of the sugar . The polarity in DNA and RNA is derived from the oxygen and nitrogen atoms in the backbone . Nucleic acids are formed when nucleotides come together through phosphodiester linkages between the 5' and 3' carbon atoms . A Nucleic acid sequence is the order of nucleotides within a DNA (GACT) or RNA (GACU) molecule that is determined by a series of letters . Sequences are presented from the 5' to 3' end and determine the covalent structure of the entire molecule . Sequences can be complementary to another sequence in that the base on each position is complementary as well as in the reverse order . An example of a complementary sequence to AGCT is TCGA . DNA is double - stranded containing both a sense strand and an antisense strand . Therefore, the complementary sequence will be to the sense strand . </P> <P> There are three potential metal binding groups on nucleic acids: phosphate, sugar and base moieties . Solid - state structure of complexes with alkali metal ions have been reviewed . </P>

A major base associated with the formation of nucleic acids is
find me the text answering this question