Monday, February 27, 2012

Compare & Contract: Replication;Transcription;Translation

Compare and Contract: Replication, Transcription, and Translation


Initiation Elongation Termination
Replication
  • DNA Helicase
  • Single-stranded binding protein
  • DNA gyrase
  • Primase: to make RNA primers
  • DNA polymerase III
  • DNA polymerase I
  • Ligase
Transcription
  • Transcription factors (->proteins)
  • TATA box (->DNA)
  • RNA polymerase II (->protein)
  • RNA polymerase II
  • AAUAAA sequence (RNA)
Translation
  • Ribosome: recognize a specific sequences (usually, AUG; occasionally, GUG, UUG) moves along the mRNA three nucleotides at a time
  • Transfer RNA(tRNA): delivers the appropriate amino acid and the polypeptide chain
  • stops when ribosome reaches a specific sequence (UAA,UAG,UGA) that does note code for and an amino acid but is instead a “stop” signal
  • The ribosome falls off the mRNA
  • the polypeptide chain is released

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