Chemistry

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Protein Structure Levels: From Primary to Quaternary.

Diagram showing the four levels of protein structure: primary (amino acid chain), secondary (pleated sheets and alpha helix), tertiary (folded polypeptide), and quaternary (multi-subunit protein).

This diagram shows the four structural levels of a protein: primary, secondary, tertiary, and quaternary. It visually explains how amino acids form a polypeptide chain and undergo folding to create functional proteins. This image is suitable for high school and college biology or biochemistry textbooks, particularly in chapters covering protein structure and function in cells.

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