The Origin of Early Life
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The review of the genetic apparatus at both the precellular and cellular levels of life provides the information necessary to suggest what steps actually took place during the development of organisms beyond the primitive broth stage. The existence of that stage can scarcely be doubted, because of the biological requirements for it and the demonstration by biochemists of numerous paths for creating its organic ingredients. Although it may not be possible to establish firmly the exact species, or even types, of amino acids that had been present in the primeval soup, it is obvious that a sufficiency of those biochemicals had been created to permit their polymerization into early polyamino acids. The formation of these polyamines is also beyond question, for the presence of some type of proteinoid is an absolute requirement for life, as was revealed by the analysis of the gentic apparatus in Chapter V. In addition, nucleosides and nucleotides of various sorts probably had existed in the primeval seas, but they do not appear to have been essential during the earliest period of life’s development.
KeywordsEarly Life Transfer RNAs Polyamino Acid Total Molecular Weight Colorless Sulfur Bacterium
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- Burton, S. D., Morita, R. Y., and Miller, W. 1966. Utilization of acetate by Beggiatoa. J. Bacteriol. 91: 1192–1200.Google Scholar
- Dillon, L. S. 1974. Neovulcanism: A proposed replacement for the concepts of plate tectonics and continental drift. Mem. Amer. Assoc. Petr. Geol. 23: 167–239.Google Scholar
- Lwoff, A., and Tournier, P. 1971. Remarks on the classification of viruses. In: Maramorosch, K., and E. Kurstak, eds., Comparative Virology., New York, Academic Press, p. 2–42.Google Scholar
- Rhodes, A. J., and van Rooyen, C. E. 1968. Textbook of Virology. 5th Ed., Baltimore, Williams & Wilkins Co.Google Scholar
- Roizman, B., and Spear, P. G. 1971. Herpesviruses: Current information on the composition and structure. In: Maramorosch, K., and E. Kurstak, eds., Comparative Virology., New York, Academic Press, p. 135–168.Google Scholar
- Rubey, W. W. 1955. Development of the hydrosphere and atmosphere, with special reference to probable composition of the early atmosphere. Spec. Paper Geol. Soc. Amer. 62: 631–650.Google Scholar
- Schaechter, M., Tousimis, A. J., Cohn, Z. A., Campbell, J., and Hahn, F. E. 1957. Morphological, chemical and serological studies of the cell walls of Rickettsia mooseri. J. Bact. 74: 822–829.Google Scholar
- Schoenheimer, R. 1942. The dynamic state of body constituents. Cambridge, Mass., Harvard University Press.Google Scholar
- Sigurdsson, B. 1954. Observations on three slow infections of sheep. Brit. Vet. J. 110: 255, 307, 341.Google Scholar
- Weiss, E. and Kiesow, L. A. 1966. Incomplete citric acid cycles in the agents of the psittacosis-trachoma group (Chlamydia). Bact. Proc. 1966: 85.Google Scholar