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19. Forklare hvad der menes med det evolutionære begreb *The RNA World*
Devlin, s.87
Stryer, s.23

RNA molecules can serve both as catalysts and carriers of genetic information. This has raised the possibility that the earliest living organisms were based entirely on RNA and that DNA and proteins evolved later. This model is sometimes referred to as “the RNA world”.

In the RNA world, RNA played all major roles, including those important for heredity, the storage of information, and promotion of specific reactions, that is, biosynthesis and energy metabolism. 

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