DNA is made up of long chains of nucleotides. To make a complete DNA molecule, single nucleotides join to make chains that come together as matched pairs and form long double strands. Each nucleotide is comprised of the following:
A five-sided (pentose) sugar called deoxyribose
A phosphate
One of four nitrogen-rich bases: adenine, guanine, cytosine, or thymine
Nucleotides are joined together by phosphodiester bonds. Nucleotide chains are antiparallel and complementary.
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Source:http://www.dummies.com/how-to/content/the-structure-of-dna.html
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