DNA is fundamental to the biology of all life on Earth, but how many of us actually know what it is or what it's made of?

All of the information needed to build and maintain an organism — whether it's a human, a dog, or a bacterial cell — is contained in its DNA. DNA molecules are composed of four nucleotides ...

DNA methylation is a fundamental epigenetic mechanism in which a methyl group is added onto a nucleotide, commonly cytosine. DNA methylation affects many biological processes, including gene ...

Other combinations of the atoms form the four bases: thymine (T), adenine (A), cytosine (C), and guanine ... molecule group together to make up a nucleotide. Nucleotides are abundant in the ...

Adjacent ribose nucleotide bases are chemically attached ... of smaller molecules called ribonucleotide bases: adenine (A), cytosine (C), guanine (G), and uracil (U). RNA is often compared to ...

The structure of a nucleotide, consisting of a phosphate group (left), a ... They contain ribose as the sugar molecule and one of four nitrogenous bases: adenine (A), guanine (G), cytosine (C), or ...