Mitochondria are called powerhouses of the cell. Which of the following observations support this statement?
| 1. | Mitochondria synthesise ATP |
| 2. | Mitochondria have a double membrane |
| 3. | The enzymes of the Krebs’ cycle and the cytochromes are found in mitochondria. |
| 4. | Mitochondria are found in almost all plants and animal cells. |
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