Dna rna for moodle

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Dna rna for moodle

  1. 1. Protein Synthesis: two parts! <ul><li>Transcription: DNA  mRNA </li></ul><ul><ul><li>occurs in the nucleus </li></ul></ul><ul><li>Translation: mRNA  protein </li></ul><ul><ul><li>occurs on the ribosome (in the cytoplasm) </li></ul></ul>
  2. 2. Transcription (RNA Synthesis) <ul><li>DNA serves as a template for the synthesis of mRNA </li></ul><ul><li>Within the nucleus </li></ul><ul><li>RNA polymerase joins RNA nucleotides </li></ul>
  3. 3. Translation (mRNA to Protein) <ul><li>mRNA attaches to ribosome </li></ul><ul><li>Each tRNA carries one amino acid </li></ul><ul><li>Anticodon on tRNA </li></ul><ul><li>matches with a codon </li></ul><ul><li>on mRNA </li></ul><ul><li>Amino acids join forming a polypeptide chain </li></ul><ul><li>Long polypeptide chains form protein!!! </li></ul>
  4. 4. How does DNA “code” for protein? <ul><li>Each codon codes for 1 of 20 amino acids </li></ul><ul><li>What amino acid chain would form from the mRNA: </li></ul><ul><li>AUGGUCCAA </li></ul><ul><li>Met–Val–Glu </li></ul>
  5. 5. The Genetic Code <ul><li>64 different combinations of RNA bases </li></ul><ul><li>1 “start” codon </li></ul><ul><ul><li>Methionine </li></ul></ul><ul><li>3 “stop” codons </li></ul>
  6. 6. Protein Synthesis Summary

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