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DNA Polymerase II. (str. K-12 substr. MG1655) DNA polymerase II (also known as DNA Pol II or Pol II) is a prokaryotic DNA-dependent DNA polymerase encoded by the PolB gene. [ 1] DNA Polymerase II is an 89.9-kDa protein and is a member of the B family of DNA polymerases. It was originally isolated by Thomas Kornberg in 1970, and characterized ...
RNA polymerase II ( RNAP II and Pol II) is a multiprotein complex that transcribes DNA into precursors of messenger RNA (mRNA) and most small nuclear RNA (snRNA) and microRNA. [ 1][ 2] It is one of the three RNAP enzymes found in the nucleus of eukaryotic cells. [ 3] A 550 kDa complex of 12 subunits, RNAP II is the most studied type of RNA ...
Polaris is the brightest star in the constellation of Ursa Minor (upper right). Big Dipper and Ursa Minor in relation to Polaris. A view of Polaris in a small telescope. Polaris B is separated by 18 arc seconds from the primary star, Polaris A. A 4 day time lapse of Polaris illustrating its Cepheid type variability.
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In a Mirror, Darkly. " In a Mirror, Darkly " is the eighteenth and nineteenth episodes of the fourth season of the American science fiction television series Star Trek: Enterprise, and originally aired on April 22 and 29, 2005. This installment was developed to be a sequel to The Original Series episode "The Tholian Web" and a prequel to ...
2 DNA Pol III enzymes, each comprising α, ε and θ subunits. (It has been proven that there is a third copy of Pol III at the replisome. [1]) the α subunit (encoded by the dnaE gene) has the polymerase activity. the ε subunit has 3'→5' exonuclease activity. the θ subunit stimulates the ε subunit's proofreading.
RNA polymerase II holoenzyme. RNA polymerase II holoenzyme is a form of eukaryotic RNA polymerase II that is recruited to the promoters of protein -coding genes in living cells. [1] [2] It consists of RNA polymerase II, a subset of general transcription factors, and regulatory proteins known as SRB proteins [clarification needed] .
RNA polymerase III. In eukaryote cells, RNA polymerase III (also called Pol III) is a protein that transcribes DNA to synthesize 5S ribosomal RNA, tRNA, and other small RNAs. The genes transcribed by RNA Pol III fall in the category of "housekeeping" genes whose expression is required in all cell types and most environmental conditions.