WIKI MOVIE

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Transcription In prokaryotes. : 

Transcription In prokaryotes.

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The RNA polymerase recognises the promoter sequence Initiation Site Termination Site

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It binds to the promoter, which includes the initiation site and 10-35 base pairs upstream of it.

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Like DNA polymerase, RNA polymerase unwinds the double helix of the DNA. RNA Polymerase Initiation Site

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The bases that are unwound are bound back together soon after. The unwound segment propagates (5’-3’ direction) along the DNA and is called the “Transcription Bubble”. RNA Polymerase

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Once past the initiation site the RNA polymerase attracts and binds bases (A, U, G & C) to the corresponding DNA bases. Initiation Site Complementary Strand Template Strand

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The strand that is used to bind with the RNA bases is called the template strand. Template Strand

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The pairing off of the bases continues on without overlapping and a molecule of mRNA is produced.

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RNA uses Uracil instead of Thymine as a base.

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The nucleoside triphosphate approaches the growing strand of the RNA.

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Two phosphates are removed and the base links on to the 3’ hydroxyl while joining the bases down the centre by hydrogen bonds.

The : 

The The DNA bases between the initiation site and the termination site is referred to as the transcription unit, it codes for a single molecule of mRNA.

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The RNA polymerase recognises the termination site and breaks away from the DNA strand and in the process releases the mRNA codon. mRna codon