单词	uracil
释义	uracil /ˈjʊərəsɪl / noun [mass noun] Biochemistry A compound found in living tissue as a constituent base of RNA. In DNA it is replaced by thymine. A pyrimidine derivative; chemical formula: C4H4N2O2. 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. Origin Late 19th century: from ur(ea) + ac(etic) + -il.
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