Labels:book | bulletin board | reckoner OCR: In DNA the bases are adenine (A) guanine (G) cytosine (C and thymine (T) In RNA uracil (U substitutes for thymine The bases constitute the alphabet and triplets bases form the words AS an example the triplet CUU in RNA instructs cell to add the amino acid leucine toa growing strand of protein From such findings we can infer that our last common ancestor stored genetic infomation in nucleic acids that specified the composition of all needed proteins also relied on proteins to direct many of the reactions required for self perpetuation Hence the central problem of origin -of -life research can be refined to ask, By what series of chemical reactions did this interdependent system of nucleic acids and proteins come into being? Anyone trying to solve this puzzle immediately encounters paradox N ...
(.png)
