The chemical structure of uracil, showing its single-ring pyrimidine structure. Uracil forms hydrogen bonds with adenine in RNA, contributing to the molecule's structure and function. (Image: Public ...

In RNA, however, a base called uracil (U) replaces thymine (T) as the complementary nucleotide to adenine (Figure 3). This means that during elongation, the presence of adenine in the DNA template ...

Ribonucleic acid (RNA) is a linear molecule composed of four types of smaller molecules called ribonucleotide bases: adenine (A), cytosine (C), guanine (G), and uracil (U). RNA is often compared ...

Nicholas Hud holds up Uracil, on the right, a nucleobase of RNA. Barbituric acid, on the left, looks very much like it and could have been part of a proto-RNA that preceded RNA. Disclaimer ...

A second pyrimidine, called thymine (T), only occurs in DNA, while the third type, uracil (U), only occurs in RNA. Nitrogenous bases are used when writing out genetic code. Gene codes are broken ...

It is a polymeric molecule composed of nucleotides, each containing a ribose sugar, a phosphate group, and one of four nitrogenous bases: adenine (A), uracil (U), guanine (G), or cytosine (C). RNA is ...

But when U.S. National Institute of Standards and Technology researchers Christina Bergonzo and Alexander Grishaev put ...

All five nucleobases that make up DNA and RNA have now been detected in meteorite samples ... identified in samples from some of the same meteorites—but also cytosine, uracil, and thymine, supporting ...