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YouTubeCognito
A-Level Biology - Proteins: Structures - 4 Main Levels | Bonds (2026/27 exams)
⭐️ Check out our website https://www.cognito.org/ ⭐️ *** WHAT'S COVERED *** 1. The four levels of protein structure and how they build upon each other. * Primary Structure: The sequence of amino acids in a polypeptide chain. * Secondary Structure: The coiling (alpha-helix) or folding (beta-pleated sheet) of the polypeptide chain ...
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