Resumen de Desperately seeking...: Initial darwinian ancestor
In the beginning was Ida, the initial Darwinian ancestor. Ida begat Luca, the last universal common ancestor, a molecule that stored information as genetic code, and gave rise to all life on Earth. Humans' cells all use the same genetic code embodied in DNA, suggesting Luca was itself made of DNA. RNA is a close relative of DNA found in all living cells that also carries genetic code and, crucially, can catalyze chemical reactions on its own. Brahic determines where RNA came from.
