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?

The remaining positions are occupied by carbon atoms, forming the backbone of important nucleobases in DNA and RNA. (Image: Public Domain) Types of Pyrimidines in Nucleic Acids There are three types ...

thymine and uracil are all pyrimidines: single rings. To maintain its orderly structure, single rings on one strand can only bond with double rings on the other. This keeps the DNA molecule in the ...

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 ...

Rather, DNA was first identified in the late 1860s ... In other words, the total amount of purines (A + G) and the total amount of pyrimidines (C + T) are usually nearly equal.

DNA integrity is always under attack from environmental ... During photoreactivation, an enzyme called photolyase binds pyrimidine dimer lesions; in addition, a second molecule known as ...