This organelle conducts respiration for the cell. it is also called the powerhouse of the cell. what is this organelle?

Mitochondrion

Explanation:

Mitochondria are membrane-bound organelles of eukaryotic cells that  generate power by converting energy into forms that are usable by the cell during the process of cellular respiration (Krebs cycle and electron transport chain with oxidative phosphorilation). The energy in the form of ATP that is produced within mitochondrion is required to perform many processes of the cell such as cell division, growth, and cell death.

Mitochondria have  oval shape and are enveloped by a double membrane, outer and inner membrane. The inner membrane is folded creating structures known as cristae. Mitochondria are organelles that contain their own DNA-mitochondrial genome.