1. Gene Expression Continued
Formation of a Protein

2. Genetic Code = relationship b/t nucleotides in DNA & amino acids
Every 3 base letters of mRNA stands for an amino acid = codon
Why 3? AUG = codon Why not 2?
How many amino acids are there? ___

3. Codon Table #1

4. Codon Table #2

5. Codon Table
START codon = AUG
STOP codons = UAA, UAG, UGA

6. STEP 2:Translation Step 2 – Translation
3 RNAs work together to assemble amino acids into a protein.
Where?

7. Phases 1 – mRNA passes through 2 subunits of ribosome (rRNA)
2 – tRNA, with anticodon (complementary to mRNA codon), brings amino acid to ribosome
3 - Peptide bond forms b/t amino acids
4 – tRNAs continue to bind & carry amino acids adding to protein chain until reach STOP codon

8. Translation

9. Translation (cont)

10. Translation

11. Gene Expression Summary

12. Molecular Biology Dogma
DNA  RNA  Protein