B1.2.4 - Infinite variety of possible peptide chains

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Last updated 8:04 PM on 10/17/26
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5 Terms

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Amino ⁣Acid Sequences

  • Cells use 20 different amino acids to build ‍proteins

  • Because any amino acid can occupy any position in a chain, the number of possible ‌sequences grows exponentially with chain length


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Sequence vs Shape

  • Sequence of amino acids ‍in a polypeptide, its primary structure, determines how the chain folds into its three-dimensional shapes

  • This shape is what lets the protein do its job

  • Sequence determines shape, shape determines function


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Possible Polypeptide Sequences of Length N

  • use the formula 20ⁿ, where 20 is ‍the number of amino acid types


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Two Components of an Amino Acid

  1. Backbone like DNA just a scaffold no information

  2. R group


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Scaffold

  • Provides a stable, repeating framework for protein assembly

  • It determines the geometry and flexibility of the polypeptide chain