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Starting & Stopping Translation. Joohee Kim Sec. III IB Biology. Genetic Information. Genetic information flow can be divided into 3 stages 1. Replication : DNA is duplicated 2. Transcription : information from DNA is transferred to RNA

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Starting stopping translation

Starting & Stopping Translation

Joohee Kim

Sec. III

IB Biology


Genetic information
Genetic Information

  • Genetic information flow can be divided into 3 stages

  • 1. Replication: DNA is duplicated

  • 2. Transcription: information from DNA is transferred to RNA

  • 3. Translation: information in mRNA is used to build polypeptides


Translation process of protein synthesis
Translation: Process of Protein Synthesis

  • 1.Initiation: 2 ribosomal subunits assemble with mRNA

  • 2.Elongation: amino acids are brought to ribosome and are added to growing polypeptide

  • 3.Termination: occur when ribosome reaches stop codon



How is reading frame chosen
How is Reading Frame Chosen?

  • Reading Frame: Non-overlapping set of three-nucleotide codons in RNA

  • Genetic code contains signals for starting and stopping translation.

  • Start Codon: AUG

  • Stop Codon: UAA, UAG, UGA


Start codon stop codons
Start Codon & Stop Codons

  • Start Codon: AUG

  • => signal for starting translation

  • Stop Codon: UAA, UAG, UGA

  • => signal for stopping translation


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