The Origins of Life on the Earth |
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Page 153
The formation of the purine nucleosides has been demonstrated under “prebiotic”
conditions, but the synthesis is not completely satisfactory. 4. The condensation
of 2-amino acids to polypeptides is unambiguous, except for aspartic acid, ...
The formation of the purine nucleosides has been demonstrated under “prebiotic”
conditions, but the synthesis is not completely satisfactory. 4. The condensation
of 2-amino acids to polypeptides is unambiguous, except for aspartic acid, ...
Page 221
At the present time, about 17 of the 20 amino acids that occur in proteins have
been obtained under plausibly prebiotic conditions. The synthesis of sugars from
formaldehyde was described a century ago by Butlerov. This reaction has been ...
At the present time, about 17 of the 20 amino acids that occur in proteins have
been obtained under plausibly prebiotic conditions. The synthesis of sugars from
formaldehyde was described a century ago by Butlerov. This reaction has been ...
Page 222
Although many important biochemicals can be synthesized under prebiotic
conditions, we know much less about prebiotic condensation reactions. It has, for
example, turned out to be surprisingly difficult to obtain nucleosides from bases
and ...
Although many important biochemicals can be synthesized under prebiotic
conditions, we know much less about prebiotic condensation reactions. It has, for
example, turned out to be surprisingly difficult to obtain nucleosides from bases
and ...
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Contents
INTRODUCTION | 1 |
GEOLOGICAL EVIDENCE | 16 |
The Present Oxidizing Atmosphere | 34 |
Copyright | |
17 other sections not shown
Common terms and phrases
abundant adenine alanine aldehydes amino acids ammonia ammonium amounts aqueous solution aspartic acid biochemical biological carbon Chem chemical concentration condensation contain COOH cyanamide cyanate cyanoacetylene cyanogen cytosine decomposition electric discharge energy enzyme equilibrium evolution evolved example formaldehyde formation formed genetic geological glutamic acid glycine half-lives hydrogen cyanide hydrolysis hydrolyzed important inorganic isomers L. E. Orgel living organisms lysine mechanism membranes metabolism meteorite methane mixture molecules nitrogen nucleic acids nucleosides obtained occur OH OH OH optically active organic compounds origin oxidation oxygen pathways peptide phosphate phosphorylation photochemical photosynthesis planets poly polymerization polymers polynucleotides polypeptides possible prebiotic conditions prebiotic synthesis Precambrian present primitive atmosphere primitive earth primitive ocean purines pyrimidines reaction replication rocks S. L. Miller S. W. Fox Science sequence solar system stars structure sugars surface t-RNA temperature tetramer thermal ultraviolet light uridine yield