Researchers Treat a Human Cell Line and a Plant Cell

Researchers treat a human cell line and a plant cell line with a drug that specifically blocks transcription of nuclear genes by an unknown mechanism.This action affects the activity of the semiautonomous organelles mitochondria and chloroplasts because these organelles

A) use nuclear RNA polymerases to transcribe their genomes.
B) are fully dependent upon host cell ribosomes.
C) do not have any of their own tRNAs.
D) import some proteins from the nuclear-cytoplasm protein synthesis pathway.
E) import all proteins from the nuclear-cytoplasm protein synthesis pathway.