GCSE Biology Revision "Required Practical 4: Food Tests" @Freesciencelessons

Uploaded April 2026 | Updated September 2026, 23 hours ago

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In this video, we look at how to test for the molecules we find in food. First we look at testing for the carbohydrates starch and glucose. We then look at testing for protein using biuret solution and lipids (fats) using ethanol. This is a required practical so it is really important that you learn the details.

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$A Level Biology Revision Cell Fractionation You can find all my A Level Biology videos fully indexed at https://www.freesciencelessons.co.uk/a-level-revision-videos/a-level-biology/ In this video, we look at how organelles are separated by cell fractionation. First we look at the roles of a homogeniser and buffer. We then look at the relative sizes of the different organelles. Finally, we explore how the organelles are fractionated by ultracentrifugation. Image credits: Pancreatic acinar cells https://commons.wikimedia.org/wiki/File:Pancreatic_acinar_cells TEM.jpg Louisa Howard, Public domain, via Wikimedia Commons Heart dissected Samuel Levy, CC BY 3.0 https://creativecommons.org/licenses/by/3.0, via Wikimedia Commons Homogeniser https://commons.wikimedia.org/wiki/File:Tissue_glass_teflon_Dounce_homogenizer-02.jpg Lilly_M, CC BY-SA 3.0 https://creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons Centrifuge https://commons.wikimedia.org/wiki/File:Multipurpose_centrifuge.JPG Retama, CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons$

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