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 twisted double strand structure -- the famed double helix ... Often this copying process makes errors, so that the wrong nucleotide is placed in position. The cell can correct these errors ...

DNA is a complex molecule that consists of two strands coiled around each other to form a double helix structure. Comparison of a single ... The double helix unwinds, and each strand serves as a ...

As shown in Figure 2, the 5'-phosphate group of the new nucleotide binds to the 3'-OH group of the last nucleotide of the growing strand ... almost as soon as the structure of DNA was elucidated ...

Because of its molecular structure, whenever one of these special nucleotides adds itself to a growing DNA strand ... Each type of nucleotide is marked with its own color: A is marked with ...

In 1953, Francis Crick and James Watson first described the molecular structure of DNA ... and twist together. Each DNA strand within the double helix is a long, linear molecule made of smaller ...