Resumen de RNA world may never have existed
Within every living cell lurks a relic from the earliest stages of life on Earth, like a flint spear point in a modem military arsenal. Its discovery is overturning people's understanding of how they came to be--and could signal the end of the favored explanation of the origin of life, "RNA world". Life has a chicken-and-egg problem: enzymes are needed to make nucleic acids--the genetic material--but to build them they need the genetic information contained in nucleic acids. So most researchers assume that the earliest life, long before the evolution of cells, consisted of RNA molecules.
