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Types of Saccharide Carbohydrates are one of the main carbon-based compounds in living organisms All molecules in this group contain C, H and O Carbon atoms are key to the structure of organic compounds because Each carbon atom can form covalent bonds; this makes the compounds very stable Covalent bonds are so strong they require a large input of energy to break them Carbon atoms can form Unlock your academic potential with Mega Lecture’s FREE download of A Level Biology Notes and Worksheets. Perfect for Edexcel (A) Biology students. AQA, OCR A, Edexcel Salters-Nuffield. Introduction The Pearson Edexcel Level 3 Advanced GCE in Biology B is designed for use in schools and colleges. Check out our website for more revision resources and other subjects and levels. Oct 26, 2025 · SimpleStudy's Edexcel A-Level Biology B revision notes provide clear explanations, concise study notes, and topic-by-topic guidance to help you build understanding, gain confidence, and achieve better results. 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