Year 11 - Science
Electron microscopy, and the size and scale of cells
Classification in modern biology
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
This unit explores the impact of biology developments on classification systems, highlighting how electron microscopy enhances understanding of sub-cellular structures. It covers eukaryotic and prokaryotic cells, quantitative skills, unit conversions, and the evolution of scientific methods.
Lesson Summary
You can describe the size and scale of cells and cell structures, and explain how electron microscopy has increased our understanding of sub-cellular structures.
Key Notes
- Most cells are too small to be seen without a microscope.
- Comparison of the sizes of cells and cell structures.
- 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.
Vocabulary To Learn
- light microscope: a type of microscope that uses visible light and a system of lenses to generate magnified images of small objects
- magnification: making small objects appear larger in order to see more detail
- resolution: the minimum distance at which two distinct points of a specimen can still be seen
- electron microscope: a type of microscope that uses a beam of electrons instead of light. Electron microscopes have a higher magnification and resolving power than light microscopes
Common Mistakes To Avoid
- Pupils may think that all cells are approximately the same size.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
Most cells are too small to be seen without a microscope. Comparison of the sizes of cells and cell structures.
2. Define this scientific word and use it in context. 'light microscope'
a type of microscope that uses visible light and a system of lenses to generate magnified images of small objects. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Pupils may think that all cells are approximately the same size. Correction: 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.
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