Eukaryotic cells have various smaller membrane bound regions inside them, which may have started as symbionts. Typical organelles are
- mitochondrion
- chloroplast - where light energy is converted into ATP molecular energy in plants
- lysosome - where proteins are digested
- cell nucleus
- Golgi complex - where the proteins due to be released from the cell are assembled
- peroxisomes (in animals) and glyoxisomes (in plants) - where fatty acids and amino acids are degraded
- flagella and cilia - hairs which give the cell mobility or move liquids past the outside of the cell
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