Biology 9th Edition by Eldra Solomon,Linda Berg ,Diana Martin

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EVOLUTION LINK. The total number of possible amino acid sequences in a polypeptide chain is staggering. Given that there are 20 amino acids, potentially there could be 20 100 different amino acid sequences (an impossibly large number), just for polypeptides only 100 amino acids in length. However, the actual number of different polypeptides occurring in organisms is only a tiny fraction of this. Why