Adenine and guanine are double-ring molecules called purines, but cytosine, thymine and uracil are all pyrimidines: single rings. To maintain its orderly structure, single rings on one strand can ...

This image illustrates the chemical structures of the five main nucleobases found in DNA and RNA. The pyrimidines, thymine (DNA), uracil (RNA), and cytosine are shown on top while the purines, adenine ...

In addition to the five nitrogenous bases—adenine, guanine, cytosine, thymine and uracil—required for building DNA and RNA, the researchers also found xanthine, hypoxanthine, and nicotinic ...

Both uracil and thymine pair with adenine ... In RNA, a point mutation can involve the substitution of uracil with another nucleobase, such as cytosine (C) or guanine (G). These mutations can ...

Three of the four nitrogenous bases that make up RNA — adenine (A), cytosine (C), and guanine (G) — are also found in DNA. In RNA, however, a base called uracil (U) replaces thymine (T ...

During the process of transcription, DNA is converted to RNA, a complex molecule that is able to carry genetic information outside of the cell's nucleus. This page guides you through the ...

In 1992, researchers found that the amination reaction of sodium bisulfite with unmethylated cytosine is different than the reaction of sodium bisulfite with 5mC. Because of this difference, ...

Nucleotides are the combination of a five-carbon sugar, ribose, along with a phosphate group and one of five possible ...