Structure of plant and animal cells under an

  • Slides: 9
Download presentation
Structure of plant and animal cells under an electron microscope Advanced Higher Biology Cell

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

The Electron Microscope • Two main advantages – High resolving power (short wavelength of

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.

The Electron Microscope • Two types – Transmission Electron Microscope (TEM) – Scanning Electron

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

Comparison of advantages and disadvantages of the light and electron microscopes Light Microscope Advantages

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

Comparison of advantages and disadvantages of the light and electron microscopes Light Microscope Disadvantages

Comparison of advantages and disadvantages of the light and electron microscopes Light Microscope Disadvantages Electron Microscope Advantages Magnifies objects up to Magnifies objects more 1500 x only than 500 000 X Depth of field is restricted Possible to investigate a greater field of depth

Comparison of pathways of the light and electron microscopes

Comparison of pathways of the light and electron microscopes

Ultrastructure of an animal cell as seen through an electron microscope

Ultrastructure of an animal cell as seen through an electron microscope

Ultrastructure of a plant cell as seen through an electron microscope

Ultrastructure of a plant cell as seen through an electron microscope

Pupil Activity • Cell structure – Read through the information on each of the

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 theory that whilst you are colouring in, you have time to consider and think about the structure and function of the organelles

Animal Cells and Plant Cells Animal cells ANIMALAnimal Cells and Plant Cells Animal cells ANIMAL
Plant and Animal Cells Plant and animal cellsPlant and Animal Cells Plant and animal cells
Animal and plant cells Animal and plant cellsAnimal and plant cells Animal and plant cells
Animal and Plant Cells Reviewed Animal Cells PlantAnimal and Plant Cells Reviewed Animal Cells Plant
Plant Cells Plant Cells Introduction Plant Cells havePlant Cells Plant Cells Introduction Plant Cells have
Cells Plant Animal Cells What are cells CellsCells Plant Animal Cells What are cells Cells
Cells Animal cells Plant cells Specialised cells OrganisationCells Animal cells Plant cells Specialised cells Organisation
Cells Animal cells Plant cells Specialised cells OrganisationCells Animal cells Plant cells Specialised cells Organisation