The Origins of Life on the Earth |
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Page 137
... condensation of two amino acid residues to form a dipeptide , and the hydration of the carbodiimide to a urea by the water generated in the condensation . The hydration of carbodiimides makes avail- able a large amount of free energy ...
... condensation of two amino acid residues to form a dipeptide , and the hydration of the carbodiimide to a urea by the water generated in the condensation . The hydration of carbodiimides makes avail- able a large amount of free energy ...
Page 148
... condensation reactions . Many interesting scraps of information are available , but there is no indication that the ... condensation of mono- nucleotides by cyanamide , " Science 173 , 444 ( 1971 ) . Cyanamide dimer and dicyanamide G. D. ...
... condensation reactions . Many interesting scraps of information are available , but there is no indication that the ... condensation of mono- nucleotides by cyanamide , " Science 173 , 444 ( 1971 ) . Cyanamide dimer and dicyanamide G. D. ...
Page 222
... condensation reactions . It has , for example , turned out to be surprisingly difficult to obtain nucleo- sides from bases and sugars . A number of prebiotic syntheses of nucleotides from nucleosides and inorganic phosphate have been ...
... condensation reactions . It has , for example , turned out to be surprisingly difficult to obtain nucleo- sides from bases and sugars . A number of prebiotic syntheses of nucleotides from nucleosides and inorganic phosphate have been ...
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