Illustrate the four levels of protein structure and explain the importance of peptide bonds in maintaining protein stability with suitable diagrams.

Proteins are complex macromolecules composed of long chains of amino acids, and their structure is essential for their function. The structure of a protein is often described in four levels: primary, secondary, tertiary, and quaternary. Each level plays a crucial role in determining the protein's final shape and function.

1. Primary Structure: The primary structure of a protein refers to the sequence of amino acids that are linked together by peptide bonds to form a polypeptide chain. Each amino acid in the sequence has a unique side chain (R-group) that determines its chemical properties. The primary structure ____ ___ ___ ________ _____ _______ _______ ________ __________ _______ ______.
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