It has been proposed that mitochondria and chloroplasts are modern descendants of early prokaryotic cells that began to reside and gradually evolve within primitive cells.

a) mitochondria and chloroplasts both have prokaryotic ribosomes
b) mitochondria and chloroplasts cannot conduct protein synthesis
c) prokaryotic cells, mitochondria, and chloroplasts are void of any dna
d) mitochondria and chloroplasts are found in all modern prokaryotic cells