Discuss the four basic structural levels of proteins, giving examples.

Proteins are essential macromolecules in living organisms, performing a wide range of functions that are vital for cellular structure, metabolism, signaling, and more. Proteins' structure is hierarchical, consisting of four primary levels: primary, secondary, tertiary, and quaternary. Each level contributes to the protein's overall function and three-dimensional shape. Here's an overview of these structural levels along with examples:

1. Primary Structure: The primary structure of a protein refers to the linear sequence of amino acids in its polypeptide chain. The sequence is encoded by the genetic information in DNA. Even __________ _____ ________ ________ ____ _________ _________.
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