The Origins of Life on the Earth |
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Page 63
... enzyme , lysozyme . The polypeptide chains making up enzymes usually contain at most a few hundred amino acids ; a few proteins , for example insulin , have much lower molecular weights . The efficiency of an enzyme depends on the ...
... enzyme , lysozyme . The polypeptide chains making up enzymes usually contain at most a few hundred amino acids ; a few proteins , for example insulin , have much lower molecular weights . The efficiency of an enzyme depends on the ...
Page 68
... enzyme , the amino acid can be changed to a similar amino acid without affecting the type of enzyme activity . In other words , there are very many amino acid sequences which have the same enzyme activity . Crystallographic studies ...
... enzyme , the amino acid can be changed to a similar amino acid without affecting the type of enzyme activity . In other words , there are very many amino acid sequences which have the same enzyme activity . Crystallographic studies ...
Page 74
... enzyme , deoxyribonucleotide triphosphates polymerize on a preformed DNA primer to give a new DNA strand ... enzyme - bound aminoacyladenylates . There is usually one enzyme NH2 N = HC : N ཋ --w པརི - 74 Chapter Six Protein Synthesis,
... enzyme , deoxyribonucleotide triphosphates polymerize on a preformed DNA primer to give a new DNA strand ... enzyme - bound aminoacyladenylates . There is usually one enzyme NH2 N = HC : N ཋ --w པརི - 74 Chapter Six Protein Synthesis,
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