Chemical 'nose' sniffs critical differences in DNA structures. ScienceDaily . Retrieved June 2, 2025 from www.sciencedaily.com / releases / 2021 / 05 / 210504112535.htm ...

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 ...

The structure of DNA can also be described as a ladder. The chemical backbones of the ladder are made up of sugar and phosphate molecules that are connected by chemical bonds.

Scientists have detected bits of adenine, guanine and other organic compounds in meteorites since the 1960s (SN: 8/10/11, SN: 12/4/20).Researchers have also seen hints of uracil, but cytosine and ...