1. Structure of plant and animal cells under an electron microscope
Advanced Higher Biology
Cell and molecular Biology

2. The Electron Microscope
Two main advantages
High resolving power (short wavelength of electrons)
As electrons negatively are charged the beam can be focused using electromagnets
As electrons are absorbed by molecules of air, a near-vacuum has to be created within the chamber of an electron microscope.

3. The Electron Microscope
Two types
Transmission Electron Microscope (TEM)
Scanning Electron Microscope (SEM)
Activity
Read through the handout on the electron microscope
Answer discussion questions 1 - 4

4. Comparison of advantages and disadvantages of the light and electron microscopes
Light Microscope
Advantages
Electron Microscope Disadvantages
Small and portable
very large
Operated in special rooms
Unaffected by magnetic fields
Affected by magnetic fields
Preparation of material is quick and simple
Preparation of material is lengthy
Requires expertise
Material rarely distorted by preparation
Preparation may distort material
Natural colour of object observed
Images are in black and white
Cheap to purchase and operate
Expensive to purchase and operate

5. Comparison of advantages and disadvantages of the light and electron microscopes
Light Microscope
Disadvantages
Electron Microscope
Advantages
Magnifies objects up to 1500x only
Magnifies objects more than X
Depth of field is restricted
Possible to investigate a greater field of depth

6. Comparison of pathways of the light and electron microscopes

7. Ultrastructure of an animal cell as seen through an electron microscope

8. Ultrastructure of a plant cell as seen through an electron microscope

9. Pupil Activity Cell structure
Read through the information on each of the organelles as you colour them in
Follow the guidance on colouring them in given at the bottom of the page
This works on the theory that whilst you are colouring in, you have time to consider and think about the structure and function of the organelles