Links
Objectives
- Discuss the reasons for limits to cell size
- Compare eukaryotic and prokaryotic cells
- Describe the cell theory
Key points
- cell theory
- cells are basic unit of life, contain reactions for life
- cells come from other cells
- cell size limits
- volume increases at a faster rate than surface area, limiting exchange rate
- diffusion within the cell becomes too limiting
- discovery of cells required technology of microscopy, optics
- resolution is ability to distinguish two separate points
- resolution depends on the wavelength of radiation source (light, electron)
- all cells have:
- plasma membrane, DNA, cytoplasm
- prokaryotes
- eukaryotes
In-class activities
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