PROTEIN SYNTHESIS

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  • Created by: Imogen
  • Created on: 10-01-12 13:33

PROTEIN SYNTHESIS.

Transcription –

During transcription an RNA copy of a gene is made in the nucleus.

  • Hydrogen bonds between the 2 DNA strands in a gene break and the DNA molecule uncoils.
  • One of the strands is then used as a template to make mRNA. The template strand is called the antisense strand.
  • mRNA is a single polynucleotide
  • RNA is an exact reverse copy of the antisense strand except T is replaced with U.
  • Free RNA mononucleotides line up along the template strand. Once they have paired up with their complementary bases they form an mRNA molecule.
  • The mRNA moves out of the nucleus through a nuclear pore and attaches to a ribosome in the cytoplasm.
  • When enough mRNA has been produced the hydrogen bonds reform and the strands coil back into a double helix.

 

Translation –

Translation occurs at the ribosomes in the

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