A carbon atom can bond with other atoms in a variety of ways. Which set of bonds would a typical carbon atom form in a compound? three double bonds and a single bond two double bonds and two single bonds a triple bond and a single bond a double bond and a triple bond.

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.