+ Translate

Speculations on the evolution of the genetic code. II

, : Speculations on the evolution of the genetic code. II. Origins of Life 9(2): 133-136

An evolutionary scheme is postulated in which a primitive code, involving only guanine and cytosine, would code for glycine (GG), alanine (GC), arginine (CG) and proline (CC). From each of these amino acids and their codons, there evolves a family of related amino acids as the code expands. The four families are: (1) alanine valine, leucine, isoleucine, phenylalanine, tyrosine, methionine and tryptophane; (2) proline, threonine and serine; (3) arginine, lysine, and histidine; (4) glycine, serine cysteine, glutamic acid, glutamine, aspartic acid and asparagine. Except for the glycine relation to glutamic acid and aspartic acid, all amino acids are related by chemical similarities in their side chains. Glycine not having a side chain would permit a more complex set of substitutions.

(PDF 0-2 workdays service)

Order PDF Full Text


Click here to order any other PDF Full Text

Accession: 041410036

PMID: 752133

PDF Full Text: Submit

Submit PDF Full Text

No spam - Every submission is manually reviewed

Due to poor quality, we do not accept files from Researchgate

Submitted PDF Full Texts will always be free for everyone
(We only charge for PDFs that we need to acquire)

Select a PDF file:

Other references

Robak, E.; Robak, T.; Góra-Tybor, J.; Chojnowski, K.; Strzelecka, B.; Waszczykowska, E.; Sysa-Jedrzejowska, A., 2001: Toxic epidermal necrolysis in a patient with severe aplastic anemia treated with cyclosporin A and G-CSF. Toxic epidermal necrolysis (TEN) and severe aplastic anemia (SAA) are rare nonpredictable side effects of several drugs. To our knowledge there are no reports on the coexistence of these two disorders. This study presents a 23 year-old man with TE...

Sarkisov A. A., 2000: Analysis of the functional uses of computerized sounding complexes when sounding the relief of the floor. Necessity of computerized hydrographic sounding complexes use when sounding the bottom of the relief is substantiated. Standard and structural schemes of such complex are adduced. Technical characteristics of all blocks, their designation and pecu...

Fowler J.F., 1991: Apparent rates of proliferation of acutely responding normal tissues during radiotherapy of head and neck cancer. Total doses, fraction sizes, and overall times reported to give "tolerance level" reactions in oral, pharyngeal, or laryngeal mucosa vary greatly in different countries. The variation in fraction size reviewed here is from 1.15 Gy (Franc...

Cepelak, J., 1971: New knowledge on the occurrence and ecology of Tachinidae, Oestridae, and Diptera in Cerchov mountains. Entomologicke problemy: 0 106-124

Hidalgo J. C. G.; Echeverria M. T., 1990: Quantification of erosion processes in the Aragon semi-arid sector; conception and installation of an experimental station. Azara (Zaragoza) 2: 35-45

Anan'ina, Yu V.; Samsonova, A. P., 1997: Possible mechanisms of the hostal persistence of Leptospira interrogans. Zhurnal Mikrobiologii Epidemiologii i Immunobiologii 0(6): 22-25, Nov -Dec

Hurst, P.S.; von Fraunhofer, J.A., 1978: In vitro studies of fluoridated amalgam. Four types of fluoridated amalgam were assessed in vitro in terms of fluoride release, corrosion behaviour and compressive strength, and compared with amalgams prepared from the corresponding non-fluoridated alloys. Although corrosion susceptibili...

Ishizaki, J.; Meguro, K.; Ishii, H.; Yamaguchi, S.; Shimada, M.; Yamadori, A.; Yambe, Y.; Yamazaki, H., 2000: The effects of group work therapy in patients with Alzheimer's disease. International Journal of Geriatric Psychiatry 15(6): 532-534

Devore George W., 1963: Compositions of silicate surfaces and surface phenomena. A general discussion of the problems of silicate surface chemistry is offered in order to describe the surface phenomena and to make significant surface contributions in petrologic relationships. The application of the principles of crystal and ph...

Chubachi A., 1990: Flow cytometric analysis of immunophenotypes in peripheral t cell lymphoma and reactive lymphadenitis. This study evaluated the diagnostic usefulness of flow cytometry using monoclonal antibodies (MoAbs) in reactive lymphadenitis and T-cell non-Hodgkin's lymphoma (NHL). The lymph node cell suspensions from 19 patients with reactive lymphadenit...