The part of the eukaryotic cell that breaks down cells and uses sugar is the organelle called the mitochondria. Mitochondria are considered the powerhouse of the cell as they are responsible for generating energy in the form of ATP (adenosine triphosphate). During a process called cellular respiration, mitochondria break down sugar molecules, such as glucose, through a series of chemical reactions to produce ATP. This energy is essential for various cellular activities and processes.
