The Origins of Life on the Earth |
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Page 80
... MEMBRANES All cells are surrounded by a membrane composed of phospholipids and proteins . These membranes prevent useful molecules from diffusing out of the cell or harmful molecules from diffusing in . Cell membranes also contain ...
... MEMBRANES All cells are surrounded by a membrane composed of phospholipids and proteins . These membranes prevent useful molecules from diffusing out of the cell or harmful molecules from diffusing in . Cell membranes also contain ...
Page 81
... membranes would have been sufficiently developed to carry out active transport . There are a number of alternatives to the use of a membrane for keeping organic molecules together . It is possible that the concentration of organic ...
... membranes would have been sufficiently developed to carry out active transport . There are a number of alternatives to the use of a membrane for keeping organic molecules together . It is possible that the concentration of organic ...
Page 222
... membranes during the earliest stages in the evolution of life is unclear . Once membranes had formed , they would certainly have been able to perform a useful function by holding together sets of prebiotic molecules , including ...
... membranes during the earliest stages in the evolution of life is unclear . Once membranes had formed , they would certainly have been able to perform a useful function by holding together sets of prebiotic molecules , including ...
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