pre-RNA

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• RNA world hypothesis — A comparison of RNA (left) with DNA (right), showing the helices and nucleobases each employs. The RNA world hypothesis proposes that life based on ribonucleic acid (RNA) pre dates the current world of life based on deoxyribonucleic acid (DNA),… …   Wikipedia

• RNA interference — (RNAi) is a mechanism that inhibits gene expression at the stage of translation or by hindering the transcription of specific genes. RNAi targets include RNA from viruses and transposons (significant for some forms of innate immune response), and …   Wikipedia

• RNA polymerase II — (also called RNAP II and Pol II) is an enzyme found in eukaryotic cells. It catalyzes the transcription of DNA to synthesize precursors of mRNA and most snRNA and microRNA. [cite journal | author = Kronberg, R.D. | title = Eukaryotic… …   Wikipedia

• RNA-induced silencing complex — RNA induced silencing complex, or RISC, is a multi protein siRNA complex which cleaves (incoming viral) dsRNA and binds short antisense RNA strands which are then able to bind complementary strands. When it finds the complementary strand, it… …   Wikipedia

• Pre Cells — Pre Cells: structures to confine RNA in ancient times. Allow the RNA to remain in close proximity with other RNA molecules, keeping them concentrated and allowing for an increased reaction rate. These enclosed structures would have facilitated… …   Wikipedia

• pre-rRNA — pre ribosomal RNA the large primary transcript that is synthesized and processed in the nucleolus to yield three of the mature rRNA molecules found in eukaryotic ribosomes (18S, 5.8S, and 28S in higher eukaryotes). Small nucleolar RNA s (snoRNA… …   Medical dictionary

• pre-tRNA — pre transfer RNA any of the primary transcripts of eukaryotic transfer RNA (tRNA) genes, synthesized in the nucleoplasm, and cleaved, modified, and sometimes spliced before transport through nuclear pore complexes to the cytoplasm, as mature tRNA …   Medical dictionary

• RNA — For other uses, see RNA (disambiguation). A hairpin loop from a pre mRNA. Highlighted are the nucleobases (green) and the ribose phosphate backbone (blue). Ribonucleic acid (English pronunciation: /raɪbɵ.njuːˌkleɪ.ɨk ˈæsɪd/), or RNA, is one of… …   Wikipedia

• RNA splicing — In molecular biology and genetics, splicing is a modification of an RNA after transcription, in which introns are removed and exons are joined. This is needed for the typical eukaryotic messenger RNA before it can be used to produce a correct… …   Wikipedia

• RNA-Interferenz — Übergeordnet Gen Silencing Post Transkriptionelles Gen Silencing Gene Ontology …   Deutsch Wikipedia

• RNA polymerase — RNAP from T. aquaticus pictured during elongation. Portions of the enzyme were made transparent so as to make the path of RNA and DNA more clear. The magnesium ion (yellow) is located at the enzyme active site. RNA polymerase (RNAP or RNApol) is… …   Wikipedia