Answer
If a eukaryotic cell lacks mitochondria it needs to have another way to synthesize the energy that the cell needs to carry out its functions. Eukaryotic cells with mitochondria use oxygen and give off carbon dioxide during cellular respiration. The use of oxygen is called aerobic cellular respiration. Since Giardia cells have no mitochondria, they would have to meet their energy requirements through anaerobic cellular respiration, which means that no oxygen is used.
Work Step by Step
Eukaryotic cells with mitochondria need oxygen to complete the process of cellular respiration so any eukaryotic cell without mitochondria would need to generate their energy anaerobically (without oxygen).
