Uracil replaces thymine in RNA because RNA is a more primitive nucleic acid than DNA, and uracil predates thymine. DNA utilizes thymine because it is easier for the cell to detect damage and transcription errors with thy... More »

www.reference.com Science Chemistry

Uracil in RNA replaces thymine in DNA, according to ScienceDaily. Both uracil and thymine bond with adenine, the complementary base found in both the RNA and DNA structures. More »

Ribonucleic acid's use of uracil instead of thymine probably developed from a genetic mutation in mRNA and from recognizing the enzyme's utility, according to the National Science Teachers Association. In its early stage... More »

www.reference.com Science Biology Molecular Biology & DNA

Uracil in RNA replaces thymine in DNA, according to ScienceDaily. Both uracil and thymine bond with adenine, the complementary base found in both the RNA and DNA structures. More »

Ribonucleic acid, known as RNA, is composed of a combination of four different nucleotides: adenine, uracil, guanine and cytosine. Each nucleotide primarily consists of a ribose sugar (five-carbon ring) and a phosphate g... More »

www.reference.com Science Biology Molecular Biology & DNA

DNA and RNA are nucleic acid polymers. Nucleic acid is a macromolecule that serves as the binding for these two genetic substances. It is a staple of all organic life. More »

Examples of key pyrimidines are cytosine, orotic acid, thymine and uracil. Either RNA or DNA can contain cytosine and thymine is usually discovered in DNA. RNA usually has uracil. At times, tRNA has both uracil and thymi... More »