Steps involved in transcription

Steps involved in transcription - molecule. Eukaryotic...

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Steps involved in transcription RNA polymerase recognizes a specific base sequence in the DNA called a promoter and binds to it. The promoter identifies the start of a gene, which strand is to be copied, and the direction that it is to be copied. RNA polymerase unwinds the DNA. RNA polymerase assembles bases that are complimentary to the DNA strand being copied. RNA contains uracil instead of thymine. A termination code in the DNA indicates where transcription will stop. The mRNA produced is called a mRNA transcript . Processing the mRNA Transcript In eukaryotic cells, the newly-formed mRNA transcript (also called heterogenous nuclear RNA or hnRNA) must be further modified before it can be used. A cap is added to the 5’ end and a poly-A tail (150 to 200 Adenines) is added to the 3’end of the
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Unformatted text preview: molecule. Eukaryotic genes contain regions that are not translated into proteins. These regions of DNA are called introns and must be removed from mRNA. Their function is not well understood. The remaining portions of DNA that are translated into protein are called exons . After intron-derived regions are removed from mRNA, the remaining fragments- derived from exons- are spliced together to form a mature mRNA transcript . The Nucleus DNA is located in an organelle called the nucleus . Transcription and mRNA processing occur in the nucleus. The nucleus is surrounded by a double membrane. After the mature mRNA transcript is produced, it moves out of the nucleus and into the cytoplasm through pores in the nuclear membrane ....
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This note was uploaded on 12/15/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.

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Steps involved in transcription - molecule. Eukaryotic...

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