It produces ATP by the breakdown of a glucose molecule.
Without mitochondria, the cell will be dependent on anaerobic respiration for energy, but survival is not possible as the energy produced will be much less compared to aerobic respiration.
The TCA cycle occurs in mitochondria.
This cycle breaks one glucose molecule into two pyruvates.
So, without mitochondria, the cell will not be able to produce sufficient energy for functioning and it will die.