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Protein Synthesis

Protein Synthesis

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Protein Synthesis

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Presentation Transcript

  1. Protein Synthesis Transcription and Translation

  2. Transcription • Begins at the start codon “ATG” and stops with “TAA”,”TAG”, or “TGA” • mRNA binds with the bases to form the mRNA code

  3. mRNA • Known as messenger RNA • RNA stands for Ribosenucleic acid (ribose sugar) • Binds with the antisense or template strand of DNA • Has a sugar – phosphate backbone to hold bases in place

  4. Create the mRNA strand Fill in the rest of the mRNA code:

  5. Compare DNA and mRNA Compare: name, size, composition (what it is made of), location, bases, and function

  6. Summarize Transcription • DNA unzipps Helpful website: DNA to mRNA Transcription

  7. Translation Ribosome

  8. tRNA • Looks like a “t” • Matches up with the mRNA code and attaches the corresponding amino acid

  9. 1. Initiation • mRNA binds to a ribosome at the 5’ end • Slides down the mRNA until it encounters the AUG or start codon • The AUG codon for methionine

  10. 2. Elongation • tRNA matches the next codon on the mRNA • The amino acid chain (the protein) is linked to the newest amino acid • The old tRNA is released • The ribosome moves down the mRNA strand to the next codon

  11. 3. Termination • The stop codon is reached on the mRNA • Either UAA, UAG, or UGA (remember U replaces T in RNA) • The protein is released from the ribosome • The mRNA is released from the ribosome

  12. Summarize Translation

  13. Try It Out • Go to the website and try to create a protein chain from the DNA code given: • Transcribe and Translate DNA • In your journal, highlight 3 things you learned today and one question you have.