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Unformatted text preview: GENETIC CODE The genetic code allows the ribosome to read the mRNA and, by determining the sequence of bases, determine the proper amino acids to be linked to form the protein. Each group of three bases forms a codon. Since there are 4 nitrogenous bases and a codon may have 3 different bases, 2 same and one different, or 3 of the same base, the number of possible codons is 64. Only 20 different amino acids are used in making proteins, so in many cases there will be more than one codon that stands for a particular amino acid. This is referred to as the degeneracy of the code. 61 of the codons code for amino acids, and are called sense codons. The remaining 3 codons do not code for any amino acid, and are known as nonsense, stop, or termination codons. AUG is a special sense codon. It stands for the amino acid methionine, but it is also known as AUG is a special sense codon....
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This note was uploaded on 01/23/2012 for the course MCB MCB2010 taught by Professor Smith during the Fall '09 term at Broward College.
- Fall '09