What is a gamete? a. the number of chromosomes in a cell b. two sets of sister chromatids c. a haploid cell produced by meiosis d. a diploid cell that split during meiosis?

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.