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Messenger RNA (mRNA) carries the DNA instructions for building the protein, transfer RNA (tRNA) carries the appropriate amino acid to the ribosome, and ribosomal RNA (rRNA) is the major component of a ribosome, the structure that reads codons on the mRNA and assembles amino acids into polypeptides.NA nucleotides contain a sugar called ribose; DNA nucleotides contain a similar sugar called deoxyribose. RNA has the nitrogenous base uracil, which behaves similarly to the thymine in DNA-that is, both uracil and thymine form complementary base pairs with adenine.
[1] RNA polymerase II (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. [2][3] A 550 kDa complex of 12 subunits, RNAP II is the most studied type of RNA polymerase.ubunits The eukaryotic core RNA polymerase II was first purified using transcription assays. [4] The purified enzyme has typically 10-12 subunits (12 in humans and yeast) and is incapable of specific promoter recognition. [5] Many subunit-subunit interactions are known.