The Origins of Life on the Earth |
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Page 160
... polynucleotide system ) . Let us accept , tentatively , the conclusion that reasonably accurate replica- tion of polynucleotides using mononucleotides as precursors may have occurred in a nonbiological environment . What degree of ...
... polynucleotide system ) . Let us accept , tentatively , the conclusion that reasonably accurate replica- tion of polynucleotides using mononucleotides as precursors may have occurred in a nonbiological environment . What degree of ...
Page 161
... polynucleotides ( primitive nucleases ) . At present there is no evidence that polynucleotides have even limited catalytic activity . In biological systems , we know that catalytic functions are performed by proteins and never by ...
... polynucleotides ( primitive nucleases ) . At present there is no evidence that polynucleotides have even limited catalytic activity . In biological systems , we know that catalytic functions are performed by proteins and never by ...
Page 162
... polynucleotides . It is difficult to avoid the conclusion that the original association was achieved by direct selective interactions between amino acids and polynucleotides , possibly assisted by polypeptides or other organic material ...
... polynucleotides . It is difficult to avoid the conclusion that the original association was achieved by direct selective interactions between amino acids and polynucleotides , possibly assisted by polypeptides or other organic material ...
Contents
PREBIOTIC SYNTHESIS OF PURINES PYRIMIDINES | 8 |
THE COMPOSITION | 12 |
GEOLOGICAL EVIDENCE | 16 |
Copyright | |
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abundant active adenine alanine aldehydes amino acids ammonia ammonium amounts anticodon aqueous solution aspartic acid biochemical biological CaCO3 carbon CH₂ chain chemical chert CO₂ concentration condensation contain COOH cyanoacetylene cytosine decomposition dust cloud electric discharge energy enzyme equilibrium escape layer evolution example formaldehyde formation formed gases genetic geological glutamic acid glycine H₂ H₂N H₂O hydrocarbons hydrogen cyanide hydrolysis hydrolyzed important inorganic L. E. Orgel limestone living organisms material mechanism membranes metabolism meteorites methane minerals mixture molecules N₂ NH₂ nitrogen nucleic acids nucleotides O₂ obtained occur organic compounds origin oxidation oxygen pathways peptide phosphate phosphorylation photochemical photosynthesis planets polymers polynucleotides polypeptides prebiotic prebiotic synthesis Precambrian present pressure primitive atmosphere primitive earth primitive ocean purines reaction replication rocks Schopf Science sequence solar system structure sugars surface t-RNA temperature ultraviolet light volcanoes yield