November 23, 2024
A Level Biology Revision

A Level Biology Revision “Cell Fractionation”

Author: Freesciencelessons via YouTube
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A Level Biology Revision

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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