Structures of Proteins

Primary Structure:

The sequence of amino acids in a polypeptide chain. Each different polypeptide is made up of different sequences of amino acids. It may contain all 20 amino acids or it could only be a few.

Secondary Structure:

The polypeptide chain twists or folds into a more stable structure: alpha-helix, beta-pleated sheet or both. Held in place with hydrogen bonds, the hydrogen bonds form between -C=O and -N-H groups of the peptide bonds. Many hydrogen bonds can form.

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