Science
Cell Biology Key Concepts
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# Cell Biology Key Concepts
## Cell Theory
1. All living things are made of cells
2. The cell is the basic unit of life
3. All cells come from pre-existing cells
## Types of Cells
- **Prokaryotic**: No nucleus (e.g. bacteria)
- **Eukaryotic**: Has nucleus (e.g. plant, animal cells)
## Key Organelles
| Organelle | Function |
|-----------|----------|
| Nucleus | Controls cell activities, contains DNA |
| Mitochondria | Produces energy (ATP) |
| Ribosome | Protein synthesis |
| Endoplasmic Reticulum | Transport network |
| Golgi Apparatus | Packages and ships proteins |
| Chloroplast | Photosynthesis (plant only) |
## Cell Division
- **Mitosis**: Cell division for growth (produces 2 identical cells)
- **Meiosis**: Cell division for reproduction (produces 4 gametes)