A compound found in living tissue as a constituent base of RNA. In DNA its place is taken by thymine.
- Thymine, present in DNA, and uracil, present in RNA, also contribute to this band.
- RNA has the same set of four bases, except that instead of thymine, RNA has uracil - commonly referred to as U.
- The nitrogen-containing units are the bases: adenine, cytosine, guanine, and uracil.
Late 19th century: from ur(ea) + ac(etic) + -il.
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