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. Tertiary Structure: The further folding of the polypeptide chain into a unique 3D shape. Quaternary Structure: The combination of two or more polypeptide chains. 2. The different types of chemical bonds that stabilise each level of protein structure. Peptide bonds linking amino acids. Hydrogen bonds forming secondary structures. Ionic bonds, disulfide bridges, and hydrophobic/hydrophilic interactions in the tertiary and quaternary structures. 3. The role of prosthetic groups in some quaternary proteins. ** CHAPTERS ** 0:00 Introduction to Protein Structure 0:25 The Four Levels of Protein Structure 0:55 Primary Protein Structure and Peptide Bonds 1:17 Secondary Protein Structure: Alpha-Helix and Beta-Pleated Sheet 2:22 Tertiary Protein Structure and Chemical Bonds 3:02 Quaternary Protein Structure and Prosthetic Groups ** PLAYLISTS **    • KS3 Biology      • KS3 Chemistry      • GCSE Maths (9-1)      • GCSE Biology (9-1)      • GCSE Chemistry (9-1)      • GCSE Physics (9-1)      • A-Level Biology   #Alevel #Biology #study #revision #school #exam #AQA #OCR #Edexcel #IGCSE #IB #AP