In a protein molecule, the number of amino acid molecules may be as few as 5
5.000
500
50

Um can u take a picture of the work

D.) domain, kingdom, phylum, class, order, family, genus then species

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.