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DNA is the molecule that holds the instructions for growth and development in every living thing. Its structure is described as a double-stranded helix held together by complementary base pairs. The basic units of DNA are nucleotides. These nucleotides consist of a deoxyribose sugar, phosphate group and a nitrogenous base.
DNA (deoxyribonucleic acid) contains deoxyribose sugars as well as phosphate groups and bases. Alternating sugars and phosphate groups form the backbone of a DNA strand