Mitochondria differ from chloroplasts in that mitochondria produce glucose, whereas chloroplasts break down glucose. Mitochondria are not found in plants, and chloroplasts are not found in animals. Mitochondria contain a folded inner membrane, whereas chloroplasts contain thylakoids in grana stacks. Mitochondria contain membrane folds called cristae, whereas chloroplasts contain disk-like stacks called thylakoids.