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DNA molecules are composed of repeating subunits called nucleotides. A nucleotide is made of three parts: a nucleobase, a certain type of sugar (deoxyribose in the case of DNA nucleotides), and one or more phosphate groups.

There are four different nucleobases found in DNA: adenine, cytosine, guanine, and thymine.

In terms of elements, the sugar contains carbon, hydrogen, and oxygen, the phosphate contains oxygen and phosphorus, and the nucelobase is carbon, hydrogen, oxygen and nitrogen.

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