defined:

One of the structural components, or building blocks, of DNA and RNA. A nucleotide consists of a base (one of four chemicals: adenine, thymine, guanine, and cytosine) plus a molecule of sugar and one of phosphoric acid.

explained:

Listen to a detailed explanation. (Requires the free RealPlayer download)

Dr. Robert Nussbaum, formerly of the National Human Genome Research Institute's Laboratory of Genetic Disease Research, defines nucleotide.

illustrated:

View illustration

related
terms:

base pair, deoxyribonucleic acid (DNA), genetic code (ATGC), ribonucleic acid (RNA)

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