Cells AQA AS Biology PART 3 of 6 TOPICS: Methods for studying cells

A quick summary on optical, tramission electron and scanning electron microscope and their pros and cons

It also includes cell fractionation

Based on AQA spec

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Cells (AQA AS Biology) PART 3 of 6 TOPICS

Methods of studying cells:
Optical microscopes


Cheaper than electron microscopes


Magnification and resolution is not as electron microscopes

Transmission electron microscopes


Smaller wavelength of electron beam allows organelles
smaller than mitochondria to be seen


Specimen has to…

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3. Ultracentrifugation is where the organelles are separated from each other. All the organelles
are poured into a tube and centrifuged where it is spun at high speed at an angle. Heaviest
organelles such as nuclei form a pellet at the bottom with all the lighter organelles at the top…


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