called cytosine (C), occurs in both types of nucleic acid. A second pyrimidine, called thymine (T), only occurs in DNA, while the third type, uracil (U), only occurs in RNA. Nitrogenous bases are ...

Kossel isolated cytosine from calf thymus tissues and found that it was a component of nucleic acids. This discovery, along with the identification of other nitrogenous bases, laid the foundation for ...

Levene proposed that nucleic acids were composed of a series of nucleotides, and that each nucleotide was in turn composed of just one of four nitrogen-containing bases, a sugar molecule ...

In the late nineteenth century, a German biochemist found the nucleic acids, long-chain polymers of nucleotides, were made up of sugar, phosphoric acid, and several nitrogen-containing bases.

Nucleic acids are complex biological molecules that store and transmit ... In DNA, two complementary strands of nucleotides pair up through hydrogen bonds between the bases (A with T and G with C) to ...

Ribonucleic acid (RNA) is a form of nucleic acid ... deoxyribose), an attached phosphate group, and one of four nitrogenous bases. Three of these four nitrogenous bases—adenine, cytosine, ...

characteristic of the cyclic nitrogenous bases present in the nucleic acids. In contrast, the homologous mature tissues exhibit a different absorption similar to that of the proteins.