In which step of translation does the trna become charged?

The answer is activation because during this amino acid is activated by aminoacyl-trna synthetase enzyme and added to trna

Mitochondria produce atp, a high energy compound. atp is used for all sorts of enzyme-mediated reactions, such as making proteins/nucleotides/etc, certain compounds cross the cell membrane, muscles move, etc.  without this source of energy, a cell will die. it will not be able to repair itself, defend against pathogens, etc.