DNA is formed by 2 chains of nucleotides, joined together by hydrogen bonds.
Nucleotides are composed of a deoxyribose (pentose) sugar, a phosphate group and an organic base.
Nucleotides join to each other to form a chain by forming phosphodiester bonds.
Nucleotide chains join to each other by forming hydrogen bonds within the organic bases
There are 4 organic bases: Adenine, Cytosine, Guanine, and Thymine.
Adenine joins to Thymine by making 2 hydrogen bonds
Cytosine joins to Guanine by making 3 hydrogen bonds.
DNA has a double helix structure.
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