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  2. RNA world - Wikipedia

    en.wikipedia.org/wiki/RNA_world

    The RNA world hypothesis places RNA at center-stage when life originated. The RNA world hypothesis is supported by the observations that ribosomes are ribozymes: [120] [121] the catalytic site is composed of RNA, and proteins hold no major structural role and are of peripheral functional importance. This was confirmed with the deciphering of ...

  3. RNP world - Wikipedia

    en.wikipedia.org/wiki/RNP_world

    This difference between protein and ribonucleoprotein catalysts can be explained by extending the RNA world theory. The older RNA molecules were originally self-catalyzed through ribozymes, which evolved the assistance of proteins to form RNP. Thereafter, the newer DNA molecule used only the more efficient protein processes from the start.

  4. Abiogenesis - Wikipedia

    en.wikipedia.org/wiki/Abiogenesis

    The RNA world hypothesis describes an early Earth with self-replicating and catalytic RNA but no DNA or proteins. [172] Many researchers concur that an RNA world must have preceded the DNA-based life that now dominates. [173] However, RNA-based life may not have been the first to exist.

  5. Leslie Orgel - Wikipedia

    en.wikipedia.org/wiki/Leslie_Orgel

    In the late 1960s, Orgel proposed that life was based on RNA before it was based on DNA or proteins. His theory included genes based on RNA and RNA enzymes. [17] This view would be developed and shaped into the now widely accepted RNA world hypothesis. Almost thirty years later, Orgel wrote a lengthy review of the RNA World hypothesis. [18]

  6. Here’s what a Nobel Prize-winning scientist wants you ... - AOL

    www.aol.com/nobel-prize-winning-scientist-breaks...

    RNA is the component that allows the CRISPR machinery to be so specific and to edit one gene in the human genome while leaving all of the other genes intact. What are some potential uses of CRISPR ...

  7. Evolution of cells - Wikipedia

    en.wikipedia.org/wiki/Evolution_of_cells

    This concept is known as the RNA world hypothesis. According to this hypothesis, the ancient RNA world transitioned into the modern cellular world via the evolution of protein synthesis, followed by replacement of many cellular ribozyme catalysts by protein-based enzymes.

  8. Bronze Age mass grave reveals grisly massacre in which ...

    www.aol.com/news/bronze-age-mass-grave-reveals...

    The latest theory suggests the opposite, ... DNA and RNA are made from “right-handed” nucleotides, and proteins are made from “left-handed” amino acids. ... They find wonder in planets ...

  9. Last universal common ancestor - Wikipedia

    en.wikipedia.org/wiki/Last_universal_common_ancestor

    Kandler's pre-cell theory is supported by Wächtershäuser. [64] [65] In 1998, Carl Woese, based on the RNA world concept, proposed that no individual organism could be considered a LUCA, and that the genetic heritage of all modern organisms derived through horizontal gene transfer among an ancient community of organisms. [66]