The Origins of Life on the Earth |
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Page 16
... geological evidence . As we shall show , this evidence is not available , since no sedimentary rocks . are known that were laid down during the period when life began . In spite of this ... GEOLOGICAL EVIDENCE, The Geological Time Scale,
... geological evidence . As we shall show , this evidence is not available , since no sedimentary rocks . are known that were laid down during the period when life began . In spite of this ... GEOLOGICAL EVIDENCE, The Geological Time Scale,
Page 23
Stanley L. Miller, Leslie E. Orgel. THE GEOLOGICAL PERIODS The various geological periods were originally ordered on the basis of their fossils , but they have now been given absolute ages , as shown in Fig . 3-2 . These determinations ...
Stanley L. Miller, Leslie E. Orgel. THE GEOLOGICAL PERIODS The various geological periods were originally ordered on the basis of their fossils , but they have now been given absolute ages , as shown in Fig . 3-2 . These determinations ...
Page 31
... geological data show that life arose sometime within about a billion years of the formation of the earth . A more precise estimate of the time needed for the synthesis of the first living organisms cannot yet be given . References ...
... geological data show that life arose sometime within about a billion years of the formation of the earth . A more precise estimate of the time needed for the synthesis of the first living organisms cannot yet be given . References ...
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