Cell: the unit of life
Part 1: how cells were found, what kinds there are, and what the parts inside them do.
In this lesson you will
- Describe how cells were discovered and state the cell theory
- Compare plant and animal cells, and prokaryotic and eukaryotic cells, with examples
- Explain the function of the nucleus, mitochondria, ER, Golgi apparatus, lysosomes, vacuoles, plastids and cell wall
- Use magnification to find the actual size of a cell from a drawing
| Cell | Typical size |
|---|---|
| Bacterium | about 1 to 5 micrometres |
| Human cheek cell | about 60 micrometres |
| Human egg cell | about 0.1 millimetre |
| Ostrich egg yolk | a few centimetres across |