Final answer:
Most mitochondrial and chloroplast proteins are made within the mitochondrion or chloroplast. These organelles have their own ribosomes.
Step-by-step explanation:
Most mitochondrial and chloroplast proteins are made within the mitochondrion or chloroplast. These organelles have their own ribosomes, which look and act more similar to prokaryotic ribosomes.
This is because endosymbiotic theory suggests that mitochondria and chloroplasts originated from ancient bacteria that established a symbiotic relationship with eukaryotic cells.