Question

which statement below provides evidence to support the endosymbiotic theory?
membranes of the endoplasmic reticulum and golgi apparatus are similar to the plasma membrane.
mitochondria and chloroplasts contain dna similar to prokaryotic dna.
both eukaryotes and prokaryotes contain dna.
both eukaryotes and prokaryotes contain ribosomes.

Explanation:

The endosymbiotic theory posits that mitochondria and chloroplasts were once free - living prokaryotes that were engulfed by a host cell. The fact that mitochondria and chloroplasts have DNA similar to prokaryotic DNA supports this idea, as it suggests an evolutionary link to prokaryotes. The other options do not specifically relate to the origin of mitochondria and chloroplasts as proposed by the endosymbiotic theory.

Answer:

Mitochondria and chloroplasts contain DNA similar to prokaryotic DNA.