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Transcription and Translation

Transcription and Translation. The Central Dogma of Biology. How does DNA make us who we are?. By making proteins! DNA contains the instructions for which proteins to make *and complicated instructions on when to make them that we don’t fully understand. We Differ in our Protein Make Up.

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Transcription and Translation

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  1. Transcription and Translation The Central Dogma of Biology

  2. How does DNA make us who we are? • By making proteins! • DNA contains the instructions for which proteins to make • *and complicated instructions on when to make them that we don’t fully understand

  3. We Differ in our Protein Make Up • I.e. difference in pigments (hair, eye, skin etc.) • I.e. difference in enzymes (make different amounts of molecules) • I.e. difference in antibodies (some get sick more often or from different things) • *A lot of differences are also due to more complicated gene expression

  4. Different Alleles • Code for slightly different versions of the protein • Probably arose through mistakes in DNA replication Makes a purple protein in flowers Makes a white protein in flowers

  5. Transcription • DNA-> mRNA • Like making a copy of the blueprint • Kind of like DNA replication- complementary nucleotides are added- EXCEPT U is used instead of T

  6. RNA vs. DNA DNA • Deoxyribose sugar • A,C, G and T nucleotides • Usually double stranded • Stores the code (like the master blueprint) • Ribose sugar • A, C, G and U nucleotides • Usually single stranded • But can fold on itself • Different types and functions • mRNA, tRNA, rRNA • Carries code, assembles proteins RNA

  7. Accomplished by RNA polymerase

  8. Where does it happen? • Each gene has a promoter • Transcription factors help RNA polymerase bind to the promoter and begin transcription

  9. Example – promoter=TATAA RNA polymerase AGCTATAACGACG T TAGCATCA T CGATAT T GCT GCAATCGTAGT T CGATAT T GCT GCAATCGTAGT DNA GCUGCAAUCGUAGU mRNA

  10. Mr. Mahon’s Pet peeve • DNA is not turned into RNA! • An RNA molecule is made based of the DNA code!

  11. Translation • mRNA Protein in the ribosome

  12. Basics of Translation • Every 3 RNA nucleotides (letters) codes for 1 amino acid • Called a “codon” • Example: DNA ATG GCA GAC RNA UAC CGU CUG Protein Tyr ArgLeu

  13. How? • A tRNA molecule carries an amino acid • tRNA nucleotides must be complementary to mRNA code

  14. tRNA (transfer RNA)

  15. Codon Table

  16. Beginning and End • Translation always begins at the Start Codon AUG and ends when a STOP codonis reached • Ex. RNA GTCA AUG GCC CCA UGG • Protein Met – Ala - Pro

  17. Translation Animation

  18. Review • Transcription • DNA (gene) transcribed to make mRNA which carries code • In Nucleus • Translation • mRNA code translated into a protein • With help of tRNA in the ribosome

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