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The Genetic Code

The Genetic Code. Using the Genetic Code. A. Codon – 3 nitrogen bases of mRNA in a row that code for a specific amino acid B. Genetic code – a chart that shows the amino acids that correspond to the codons of mRNA. C. How nucleotides are read – 3 at one time 1. 3 DNA nucleotides = CAT

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The Genetic Code

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  1. The Genetic Code

  2. Using the Genetic Code A. Codon – 3 nitrogen bases of mRNA in a row that code for a specific amino acid B. Genetic code – a chart that shows the amino acids that correspond to the codons of mRNA

  3. C. How nucleotides are read – 3 at one time • 1. 3 DNA nucleotides = CAT • 2. 3 mRNA nucleotides = • 3. tRNA nucleotides = GUA CAU

  4. D. Reading the Genetic Code 1. 1st letter (base) of the codon = G 2. 2nd letter (base) of the codon = U 3. 3rd letter (base) of the codon = A Using the genetic code on the front, which amino acid does the above codon produce? ________ Valine

  5. E. To “make” a protein 1. Transcribe the given DNA strand into mRNA 2. Look up the mRNA codons on the Genetic Code table

  6. Practice: AUG UUU CAU ACC CCG UAG Met- Phe- His- Thr- Pro- stop

  7. ACC UGG ACC AGA UCU Serine AAA UUU Lysine ACT ACU Stop

  8. Although there are only 20 amino acids in the human body, thousands of proteins exist because the sequence and number of amino acids are different.

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