BIOCHEMISTRY A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z                    HOME ABOUT CATEGORIES SITE MAP COPYRIGHT ADVERTISE CONTACT entire Web this site uracil A pyrimidine that is one of five organic bases found in the nucleic acids of cells. It pairs with adenine in RNA. The difficulty of synthesizing uracil and cytosine in laboratory experiments intended to mimic conditions on the primordial Earth has left a question mark over current models of prebiotic evolution. Related categories    • BIOCHEMISTRY    • ORIGIN AND EVOLUTION OF LIFE Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) BACK TO TOP