AS Biology Revision Unit 1 3.1.3 Cells and Movement In and Out of Them

Powerpoint Presentation summarising chapter 3 of the AQA AS Biology Textbook.

I made this using the AQA AS Biology Textbook, my class notes and the specification.

I hope it helps :)

If you have any queries or corrections please leave them in the comments and I'll try and help 

Thanks **

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Microscopes
LIGHT MICROSCOPE
TRANSMISSION ELECTRON MICROSCOPE
SCANNING ELECTRON MICROSCOPE…read more

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Light Microscope
Maximum Magnification is x1500.
Maximum Resolution is 0.2µm (200nm).
Focusing method is eyepiece lens and objective lens.
Specimen Preparation is
Wet Mount on slide
Stained
Can be living or dead.
Image is viewed through the eyepiece at the actual
specimen.…read more

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Light Microscope
Advantages Disadvantages
Can View Specimens Can't view objects
which are alive. which are closer than
Can view plant and 0.2µm apart.
animal cells, bacteria
and some large
organelles.…read more

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Transmission Electron Microscope (TEM)
Maximum Magnification is x500,000.
Maximum Resolution is 0.001µm (1nm).
Focusing Method is electromagnetic lenses.
Specimen Preparation is
Killed, dehydrated and fixed.
Coated in heavy metal stains.
Must be dead.
Image is viewed on a fluorescent screen and then
that image is fed onto a computer screen.…read more

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Transmission Electron Microscope (TEM)
Advantages Disadvantages
Can view very small Artefacts
specimens. Features that are caused
by the harsh preparation
Specimens can be
and do not really exist in
viewed at a higher the living cell.
magnification and Specimens must be
resolution so sub- dead.
cellular images can be
A vacuum is needed.
seen.…read more

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