enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  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. RNA - Wikipedia

    en.wikipedia.org/wiki/RNA

    It has become widely accepted in science [1] that early in the history of life on Earth, prior to the evolution of DNA and possibly of protein-based enzymes as well, an "RNA world" existed in which RNA served as both living organisms' storage method for genetic information—a role fulfilled today by DNA, except in the case of RNA viruses—and ...

  4. Ribozyme - Wikipedia

    en.wikipedia.org/wiki/Ribozyme

    RNA can also act as a hereditary molecule, which encouraged Walter Gilbert to propose that in the distant past, the cell used RNA as both the genetic material and the structural and catalytic molecule rather than dividing these functions between DNA and protein as they are today; this hypothesis is known as the "RNA world hypothesis" of the ...

  5. List of RNAs - Wikipedia

    en.wikipedia.org/wiki/List_of_RNAs

    5' small nucleolar RNA capped and 3' polyadenylated long noncoding RNA - SRP RNA: signal recognition particle RNA CL00003: ssRNA single stranded RNA - stRNA: small temporal RNA - tasiRNA: trans-acting siRNA - tmRNA: transfer-messenger RNA RF00023: Bacterial RNA molecule with dual tRNA-like and messenger RNA-like properties uRNA U spliceosomal ...

  6. 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.

  7. RNP world - Wikipedia

    en.wikipedia.org/wiki/RNP_world

    The period followed the hypothesized RNA world and ended with the formation of DNA and contemporary proteins. [2] In the RNP world, RNA molecules began to synthesize peptides. These would eventually become proteins which have since assumed most of the diverse functions RNA performed previously. This transition paved the way for DNA to replace ...

  8. 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]

  9. Abiogenesis - Wikipedia

    en.wikipedia.org/wiki/Abiogenesis

    In an RNA world, the ribozyme would have had even more functions than in a later DNA-RNA-protein-world. For RNA to function, it must be able to fold, a process that is hindered by temperatures above 30 °C. While RNA folding in psychrophilic organisms is slower, the process is more successful as hydrolysis is also slower. Shorter nucleotides ...