Two nucleotides together form a base pair ... Adenine and guanine are double-ring molecules called purines, but cytosine, thymine and uracil are all pyrimidines: single rings.
Most DNA molecules consist of two polymers (double-stranded) of four nucleotides that each consist of a nucleobase, the carbohydrate deoxyribose and a phosphate group, where the carbohydrate and ...
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