Thursday, October 24, 2013

RNA world hypothesis - Wikipedia, the free encyclopedia

RNA world hypothesis - Wikipedia, the free encyclopedia

One of the challenges in positing abiogenesis [non-living chemicals giving rise to living things] is that the system of memory, reproduction and metabolism utilized by all extant cells has a level of complexity, involving three distinct macromolecules, that suggests it could not have arisen in its current form, and yet the interdependence of its components makes a more simplified mechanism challenging. Mechanisms have then been sought whereby the current system might have arisen from a simpler precursor system

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