This biology video tutorial provides a basic introduction into the four levels of protein structure - primary, secondary, tertiary and quarternary structure. The primary structure of a protein is based on the sequence of amino acids. The secondary structure is based on localized shapes such as the alpha helix or the beta pleated sheet. The tertiary structure of a protein describes its three-dimensional folding pattern. A tertiary structure contains one individual subunit where as a quarternary structure has multiple subunits.
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