The Origins of Life on the Earth |
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Page vii
... PYRIMIDINES , AND NUCLEOSIDES , 103 Introduction , 103 Synthesis of Purines , 103 Synthesis of Pyrimidines , 108 Sugars , 109 Nucleoside Synthesis , 112 References , 116 9. STABILITY OF ORGANIC COMPOUNDS AND THE TEMPERATURE OF THE ...
... PYRIMIDINES , AND NUCLEOSIDES , 103 Introduction , 103 Synthesis of Purines , 103 Synthesis of Pyrimidines , 108 Sugars , 109 Nucleoside Synthesis , 112 References , 116 9. STABILITY OF ORGANIC COMPOUNDS AND THE TEMPERATURE OF THE ...
Page 108
... PYRIMIDINES The synthesis of the biologically important pyrimidines - cytosine , uracil , and thymine - under potentially prebiotic conditions has not been investigated as extensively as purine synthesis . NH2 HN HN CH3 $ 13 H Cytosine ...
... PYRIMIDINES The synthesis of the biologically important pyrimidines - cytosine , uracil , and thymine - under potentially prebiotic conditions has not been investigated as extensively as purine synthesis . NH2 HN HN CH3 $ 13 H Cytosine ...
Page 123
... PYRIMIDINES , AND NUCLEOSIDES The rates of hydrolysis of adenine to hypoxanthine and of guanine to xanthine seem to be so slow at reasonable pH values that the instability of these purines is not a serious problem . The pyrimidine ring ...
... PYRIMIDINES , AND NUCLEOSIDES The rates of hydrolysis of adenine to hypoxanthine and of guanine to xanthine seem to be so slow at reasonable pH values that the instability of these purines is not a serious problem . The pyrimidine ring ...
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