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

Advantages:

Cheaper than electron microscopes

Disadvantages:

Magnification and resolution is not as electron microscopes



Transmission electron microscopes

Advantages:

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

Disadvantages:

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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