The Origins of Life on the Earth |
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Page 49
... evolved in lakes or tidepools , our conclusion about the ammonia content of the oceans is tentative . This discussion makes it clear that the primitive atmosphere , often spoken of as a methane - ammonia atmosphere , must have been a ...
... evolved in lakes or tidepools , our conclusion about the ammonia content of the oceans is tentative . This discussion makes it clear that the primitive atmosphere , often spoken of as a methane - ammonia atmosphere , must have been a ...
Page 179
... evolved before any essential component of the prebiotic soup was exhausted . Free energy was derived from prebiotic condensing agents such as cyanamide or inorganic polyphosphates . Stage 2. A few essential components of the prebiotic ...
... evolved before any essential component of the prebiotic soup was exhausted . Free energy was derived from prebiotic condensing agents such as cyanamide or inorganic polyphosphates . Stage 2. A few essential components of the prebiotic ...
Page 186
... evolved before the earlier ones . A detailed discussion of this problem was first given by Horowitz . He supposed that the prebiotic soup contained compounds that were directly useful to primitive organisms , for example , the amino ...
... evolved before the earlier ones . A detailed discussion of this problem was first given by Horowitz . He supposed that the prebiotic soup contained compounds that were directly useful to primitive organisms , for example , the amino ...
Contents
PREBIOTIC SYNTHESIS OF PURINES PYRIMIDINES | 8 |
THE COMPOSITION | 12 |
GEOLOGICAL EVIDENCE | 16 |
Copyright | |
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Common terms and phrases
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