Was RNA the First Genetic Polymer?
In recent years the hypothesis that an ‘organism’ based on RNA but lacking proteins is the ancestor of all living things has become increasingly popular (Cech, 1986; Darnell & Doolittle, 1986; Gilbert, 1986; Westheimer, 1986). The purpose of this article is to discuss the consequences of this hypothesis from the point of view of a chemist interested in the origins of life. How could such an organism have evolved? The nature of the ‘metabolism’ of the first RNA organisms is outside the scope of our discussion. We assume only that they made use of catalytic RNAs (ribozymes), one of which was capable of carrying out RNA replication.
KeywordsNucleotide Analogue Zirconium Phosphate Prebiotic Synthesis Glyceraldehyde Phosphate Genetic Polymer
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