Article Abstract:
The reductive evolution of the mitochondrial genome is correlated with its inability to support genetic recombination. Reductive evolution refers to the simplifications of animal mitochondrial translation systems such as the minimization of genes used by mitochondrial genomes to code for tRNA species. Codon reassignment confers selective advantage by reducing the undesirable effects of some mutational bias. Reductive evolution of mitochondrial genomes is driven by two forces affecting small populations: growth rate competition and Muller's ratchet.
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Article Abstract:
Studies on beta-galactosidase enzymes showed that it exhibits alpha, omega and beta complementations. Compared to wild-types, these complemented enzymes only minimally recovered their activity after renaturation suggesting the absence of the connecting part of their polypeptides. With guanidine denaturation, full recovery of the peptides occured after removal of guanidine. An alpha and a 40 kildodalton omega peptide are essential for these observed effects.
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Article Abstract:
A novel experimentally testable hypothesis of a process by which selective chirality in amino acids and ribonucleotides emerged simultaneously and hand-in-hand with the origin and directionality of the genetic code within a system of interactions involving amino acids, peptides, nucleotide bases and their sugars and polynulceotides are presented.
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