Describe the four levels of protein structure. Explain how the structure of a protein determines its function using hemoglobin as an example.

Proteins are complex macromolecules made up of amino acids linked together by peptide bonds. Their structure is intricately organized into four levels—primary, secondary, tertiary, and quaternary—each contributing to the protein’s overall shape and functionality. The structure of a protein dictates its function, and this relationship can be understood by examining the structure of hemoglobin, a protein involved in oxygen transport in the blood.

Primary Structure: The primary structure of a protein refers to the linear sequence of amino acids in a polypeptide chain. The sequence is determined by the genetic code and dictates the protein's unique characteristics. In hemoglobin, the primary structure is composed of 574 amino acids distributed across four subunits: two alpha (α) and two beta (β) ______ ___ ____ ________ ______ ________ _________.
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