Molecular Asymmetries in Biological Evolution and the Role of Water and Ions

  • C. Portelli


In a previous paper1, a model was presented according to which the living organisms manifests a selectivity for L-amine acids and beta-D-pentose molecules because of the asymmetric nitrogen atom included in the structure of the nucleotide bases and at the level of the peptide bonds of protein molecules. Thisasymmetric nitrogen atom presents a first covalent bond (C+→N), which has a major electric polarization, a second covalent bond (C+→N), which has a minor electric polarization, and a third covalent bond with a hydrogen atom. The hydrogen atom, covalently bound to the asymmetric nitrogen atom, is preferentially directed to the side of the molecular plane of the nucleotide base in a position from where an observer should see the sense of the major electric polarization as being in the counter clockwise direction of the molecular ring.


Covalent Bond Electric Polarization Nucleotide Base Molecular Plane Counter Clockwise Direction 
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Copyright information

© Springer Science+Business Media New York 1985

Authors and Affiliations

  • C. Portelli
    • 1
  1. 1.Department of BiophysicsFaculty of MedicineBucharestRomania

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