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14 Cards in this Set
- Front
- Back
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what is a gene
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sequence of dna that is transcriped
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what are housekeeping genes
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these are genes essentiall for for normal cellular activity
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what do house keeping genes encode
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protiens and rna
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what do t rna do ?
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transfers a specific active amino acid to a growing polypeptide chain at the ribosomal site of protein synthesis
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rRNA
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the protein manufacturing machinery of all living cells
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mRNA
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carries coding information to the sites
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what transcribes rna sythesis?
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rna polyerase
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are added as nucleotidyl group transer reactions using dna as template
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ribonucleoside triphosphate
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termination sequence
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disassemlely of the transcription complex at the 3' end.
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pause site
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site of termination for transcription sequence
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how can transciption complex terminate:
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1. haripin structure this destabilizes and deformation causes the elongation to cease.
2. rho dependent termination - happens at the pause site where rho ninds to newly systhesized rna and binds around it destablizing it. |
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A/T regions does what
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transcription begins
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G/C regions does what
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transcrition ends.
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steps to transcription
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1. the holoenzyme goes to the dna and bind non specically, then the sigma molecule cause the affinity for the promoter to increase and search for promotro finds it and then make a closed complex. then goes to open make transciption bubble where the rna is synthesize and then sigma dissacotes and nus comes in not allwoing the holoenyze to and keeping it bound polyermase bound to template until termination
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