Transcription of DNA by Bruce Thomson https://padlet.com/brucecraigthomson/m8rocuidf5wy en-us 2017-10-30 23:15:09 UTC 2017-11-08 20:12:08 UTC hello@padlet.com 1. https://padlet.com/brucecraigthomson/m8rocuidf5wy/wish/204981171 Transcription is the synthesis of mRNA from a section of DNA]]> 2017-11-08 18:30:34 UTC https://padlet.com/brucecraigthomson/m8rocuidf5wy/wish/204981171 Aces https://padlet.com/brucecraigthomson/m8rocuidf5wy/wish/204981509 Transcription is the synthesis of mRNA from a section of DNA

Transcription begins when RNA polymerase attaches to promoter sequence located before the start of the gene. 

The RNA polymerase builds a strand of mRNA (5' t 3')  using free ribonucleotides (adenine, guanine, cytosine, uracil) which are freely available in the nucleus 

The enzyme the catalyses a strong covelent bond between the ribonucleotides to form an RNA strand sugar phosphate backbone

Assembly of the mRNA strand is similar to DNA replication except that as the strand is being built from ribonucleotides there is no need for a primer

transcription termination DNA sequences tell RNA pol


]]> 2017-11-08 18:31:08 UTC https://padlet.com/brucecraigthomson/m8rocuidf5wy/wish/204981509 Group 4 https://padlet.com/brucecraigthomson/m8rocuidf5wy/wish/204982191 Transcription is the synthesis of mRNA from a section of DNA. 

RNA polymerase is the enzyme responsible for transcription.

RNA moves along the gene strand from the Promotor causing unwinding and unzipping of the double helix structure of DNA and brings about the syntthesis of an mRNA molecule.

Primary transcript of mRNA has coding areas made up of Exons and introns and as the INtrons have been removed from the mRNA by Splicing it creates the Mature mRNA strand.

DNA transcribed to mRNA is about 8000 nucleotides long. only 1200 nucleotides are required to code an average sized polypeptides.

 

]]> 2017-11-08 18:32:09 UTC https://padlet.com/brucecraigthomson/m8rocuidf5wy/wish/204982191 Group 3 https://padlet.com/brucecraigthomson/m8rocuidf5wy/wish/204984698 2017-11-08 18:35:59 UTC https://padlet.com/brucecraigthomson/m8rocuidf5wy/wish/204984698 Synthesis of mRNA from a section of DNA https://padlet.com/brucecraigthomson/m8rocuidf5wy/wish/204986796  
Synthesis of mRNA from a section of DNA 

 

Transcribing or making a copy 

 

Genetic information is copied but the language remains the same 

 

Helix unwinds and H-bonds separate 

 

RNA polymerase carries transcription making RNA copies of DNA 

 

Three stages – initiation, elongation, and termination 

 

RNA polymerase attaches to the promoter sequence located before the start of the gene 

]]> 2017-11-08 18:39:22 UTC https://padlet.com/brucecraigthomson/m8rocuidf5wy/wish/204986796 Group 2 https://padlet.com/brucecraigthomson/m8rocuidf5wy/wish/205035129 2017-11-08 20:04:42 UTC https://padlet.com/brucecraigthomson/m8rocuidf5wy/wish/205035129 Group 3 https://padlet.com/brucecraigthomson/m8rocuidf5wy/wish/205037023 Before translation can begin a ribosome must bind to the 5 end of the mRNA template so that the mRNa ]]> 2017-11-08 20:08:31 UTC https://padlet.com/brucecraigthomson/m8rocuidf5wy/wish/205037023