The Genetic Code - Bi Sci 001 Friday Announcements If you...

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Bi Sci 001 Friday January 22, 1999 Announcements: If you have just added the course then you can go to the web and listen to past lectures, but be sure to buy the note pack from the Student Book Store down town. If you are lefty, have long legs or have a disability be sure to sign the sheet in the front of class so that for the exam next Friday (Jan 29) you can be seated appropriately because there are assigned seats. Lecture notes: The Genetic Code Every 3 nucleotides (base triplet) specifies an amino acid to be added to the growing polypeptide chain. 61 of the 64 triplets code for amino acids. 3 are stop signal. UAA is a stop signal These triplets are called codons . There are only 2 amino acids that have only one codon: methionine (AUG) tryptophan (UGG) Methionine is also the START signal for protein synthesis. (AUG) These same codes are used (with only a few minor exceptions) in bacteria, fungi, plants and animals. Amino Acids: building blocks of proteins There are 20 common amino acids that appear in proteins. These same amino acids appear in all proteins in all forms of life (and viruses).
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