human
What is the most important discovery in chemistry?
assistant
The most important discovery in chemistry is the structure of DNA. DNA is a molecule that contains the genetic instructions for all living things. It is made up of four different nucleotides, which are adenine, guanine, cytosine, and thymine. These nucleotides are arranged in pairs, forming two strands that run in opposite directions. The strands are held together by hydrogen bonds between the nucleotides.