Uracil - Wikipedia
Apparently, either there was no evolutionary pressure to replace uracil in RNA with the more complex thymine, or uracil has some chemical property that is useful in RNA, which thymine lacks.

Uracil | Nucleobase, Nucleoside & DNA | Britannica
Uracil, a colourless, crystalline organic compound of the pyrimidine family that occurs as a component of ribonucleic acid (RNA), a molecule involved in the transmission of hereditary characteristics.

Uracil | C4H4N2O2 | CID 1174 - PubChem
Uracil is a common and naturally occurring pyrimidine nucleobase in which the pyrimidine ring is substituted with two oxo groups at positions 2 and 4. Found in RNA, it base pairs with adenine and replaces thymine during DNA transcription.

Uracil - National Human Genome Research Institute
Uracil (U) is one of the four nucleotide bases in RNA, with the other three being adenine (A), cytosine (C) and guanine (G). In RNA, uracil pairs with adenine. In a DNA molecule, the nucleotide thymine (T) is used in place of uracil.

Uracil Definition and Examples - Biology Online Dictionary
Uracil is similar to thymine in terms of structure except for the methyl group at position 5 in the heterocyclic aromatic ring that present in thymine. It has a chemical formula of C 4 H 4 N 2 O 2.

Uracil - New World Encyclopedia
Uracil is used in animals and plants to help carry out the synthesis of many enzymes necessary for cell function through bonding with riboses and phosphates (Garrett and Grisham). Uracil serves as an allosteric regulator and coenzyme for reactions in the human body and in plants (Brown 1998).

Uracil - (General Biology I) - Vocab, Definition, Explanations ...
Uracil is a nitrogenous base that is one of the four main building blocks of RNA, replacing thymine found in DNA. It plays a crucial role in coding, decoding, and regulating genes, linking to protein synthesis and various cellular processes.

The Chemistry of Uracil: A Deep Dive - numberanalytics.com
Uracil is one of the four nucleobases found in the nucleic acid of RNA. It plays a crucial role in the structure and function of RNA, and its unique chemical properties make it an important molecule to study.

Uracil: Structure, Synthesis and Uses - allen.in
Uracil is one of the four nucleobases found in RNA (ribonucleic acid), which is a type of genetic material present in cells. Learn more about uracil here.

Uracil (U) in RNA: Essential Nucleobase Pairing with Adenine - Nanowerk
Uracil is a key nucleobase in RNA, forming base pairs with adenine. It plays crucial roles in RNA structure, function, and the genetic code, with applications in biotechnology.