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