defined:

One of the four bases in RNA. The others are adenine, guanine, and cytosine. Uracil replaces thymine, which is the fourth base in DNA. Like thymine, uracil always pairs with adenine.

explained:

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

Dr. Richard Morgan, formerly of the National Human Genome Research Institute's Clinical Gene Therapy Branch, defines uracil.

illustrated:

View illustration

related
terms:

deoxyribonucleic acid (DNA), ribonucleic acid (RNA), protein, genetic code (ATGC), nucleotide

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