Classification. The following items are organelles found in animal cells. Respond to the statements below with reference to these organelles. This organelle is the site of polypeptide assembly. a. Ribosome This two-part organelle is found in the endoplasmic reticulum. b. Mitochondrion The cellular digestion and disposal of biological molecules occurs c. Lysosome inside this organelle. d. Golgi body This organelle plays a role in cell defense. e. Endoplasmic reticulum Aerobic respiration occurs in this organelle. This organelle has its own DNA. This organelle comprises a smooth section and a rough section. The packaging of secretory proteins occurs in association with this structure. This organelle is involved in lipid production and protein transport..