Describe the four structural levels of proteins

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1. The primary structure of a protein resembles a string of beads in which the amino acids form the basis for the protein molecule.
2. A protein in its secondary structure may exist in a coiled alpha-helix or an accordion-like beta-pleated sheet.
3. Most proteins reach the more complex tertiary level of structure. The tertiary structure is achieved when the alpha-helical or beta-pleated region of the polypeptide chain folds in on itself to form a globular (ball-like) molecule.
4. The quaternary structure results when two polypeptide chains combine to form a complex protein.

Anatomy & Physiology

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Anatomy & Physiology