- Messenger RNA is made in the nucleus by transcription from a DNA molecule.
- A ribosome on the rough endoplasmic reticulum (RER) attaches to the mRNA molecule.
- A transfer RNA molecule arrives and brings an amino acid to the first three bases (codon) on the mRNA.
- The three unpaired bases (anticodon) on the tRNA link up with the codon.
- Another tRNA molecule comes into place bringing a second amino acid
- Its anticodon links up with the second codon (next three bases) on the mRNA
- A peptide bond is formed between the two amino acids
- The first tRNA molecule releases its amino acid and moves off into the cytoplasm
- The ribosome moves along the mRNA to the next codon
- Another tRNA molecules bring in the next amino acid into place
- A peptide bond joings the second and third amino acid to form a polypeptide chain
- The process continues - polypeptide chain gets longer, this continues until termination (stop) codon is reached then the polypeptide is complete
Sunday, 9 June 2013
Translation of the Genetic Code: Protein Synthesis
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