The nucleus of a eukaryotic cell contains the genetic material of the cell and is surrounded by cytoplasm which contains many organelles. These include:
| Organelle | Function | 
|---|---|
| ribosomes | produce proteins | 
| mitochondria | produce energy | 
| endoplasmic reticulum | helps synthesize proteins and fats | 
| Golgi apparatus | prepare proteins for use | 
| lysosomes | help the cell manage waste | 
| centrosomes | guide cell reproduction | 
In cell biology, __________ is the organelle that guides cell reproduction.