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A-Level Biology OCR A

Trna Mrna Amino Binds Codon Ribosome Start Bound

Front Describe the process of translation in a series of bullet points.
Back Translation:
  • mRNA binds to small subunit of ribosome at its start codon 
  • A tRNA with the complementary anticodon binds to the mRNA start codon (tRNA carries the corresponding amino acid)
  • Next tRNA with anticodon, carrying the corresponding amino acid, binds to the next codon on mRNA
  • Maximum of two tRNA can be bound at same time
  • First amino acid is bound to the second tRNA amino acid by the formation of a peptide bond - catalysed by peptidyl transferase
  • Ribosome moves along mRNA releasing the first tRNA, the second tRNA becomes the first until the stop codon is reached, leaving fully assembled polypeptide chain

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