Electron microscopy, and the size and scale of cells: including standard form
I can describe the size and scale of cells and cell structures, and explain how electron microscopy has increased our understanding of sub-cellular structures.
Electron microscopy, and the size and scale of cells: including standard form
I can describe the size and scale of cells and cell structures, and explain how electron microscopy has increased our understanding of sub-cellular structures.
Lesson details
Key learning points
- Most cells are too small to be seen without a microscope.
- Comparison of the sizes of cells and cell structures in µm, nm, and in mm in standard form.
- Light microscopes have limited magnification and resolution.
- Electron microscopes have greater magnification and resolution, allowing much smaller structures to be seen clearly.
- Electron microscopy has increased our understanding of sub-cellular structures.
Keywords
Light microscope - A type of microscope that uses visible light and lenses to generate magnified images of small objects.
Electron microscope - A type of microscope that uses a beam of electrons instead of light to magnify objects.
Magnification - Making small objects appear larger in order to see more detail.
Resolution - The minimum distance apart that two points of a specimen can be and still be clearly seen as separate from one another using a microscope.
Standard form - A way of writing down very large or very small numbers easily; e.g. 1000 = 10³.
Common misconception
Pupils might think that all cells are approximately the same size.
Calculations in the deck will allow pupils to compare the relative sizes of cells. It might be helpful to draw extra attention to this point.
Equipment
calculators
Licence
This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Lesson video
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