Final answer:
Mitochondria and peroxisomes differ in that only mitochondria have membranes containing protein translocators that facilitate the unfolding and entry of proteins.
Step-by-step explanation:
Mitochondria and peroxisomes do NOT have in common that their membranes contain a protein translocator. Proteins need to unfold to enter mitochondria, a process facilitated by protein translocators, such as TIM and TOM complexes found in the mitochondrial membranes. Peroxisomes, however, allow proteins to translocate across their membrane without complete unfolding. Both mitochondria and peroxisomes are present in eukaryotic cells and are essential for cellular metabolism, requiring the import of proteins to function properly. Mitochondria are the powerhouse of the cell, creating ATP through cellular respiration, while peroxisomes are involved in lipid metabolism and the detoxification of harmful substances.