DNA is a macro molecule or a large molecule and contains two interrelated links of polynucleoside. Each nucleotide is formed by three components of nitrogen, pentose sugar, and phosphate group. In the base of nitrogen there is a base of primidin and purine base. Primidinous bases are thymine and cytosine whereas in the basic bases there are adenine and guanine @elfaisal
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Well said @taufar.