DNA building blocks found in meteorites
Using modern analytical techniques, scientists have discovered pyrimidine bases necessary for building DNA and RNA in three carbon-rich meteorites. The discovery supports the idea that the building blocks, playing a role in the genetic functions of early life, were transported to Earth from space. The findings are presented in the journal Nature Communications.
"Two types of chemical building blocks, or nitrogenous bases, are needed to form DNA and RNA. These are the pyrimidines, which include cytosine, uracil and thymine, and the purines," the study authors say.