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The nucleotide contains both a segment of the backbone of the molecule (which holds the chain together) and a nucleobase (which interacts with the other DNA strand in the helix).

A nucleobase linked to a sugar is called a nucleoside and a base linked to a sugar and one or more phosphate groups is called a nucleotide.

Within eukaryotic cells DNA is organized into long structures called chromosomes.

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The complementary nitrogenous bases are divided into two groups, pyrimidines and purines.

A polymer comprising multiple linked nucleotides (as in DNA) is called a polynucleotide.