What is one piece of evidence that some organelles like mitochondria and chloroplasts within eukaryotes used to be independent prokaryotes that were incorporated into eukaryotic cells?
A) prokaryotes are seen incorporating into cells today
B) organelles float around independently inside eukaryotic cells
C) the DNA inside organelles is not made of the same four bases as the DNA in the host cells
D) they have their own DNA and reproduce independently of the host cell

Question

Quizplus · Accepted Answer

The fact that organelles such as mitochondria and chloroplasts have their own DNA and are capable of independent replication strongly suggests that they were once independent prokaryotes that were later incorporated into eukaryotic cells. This is further supported by their unique DNA sequences and the presence of prokaryotic-like structures such as ribosomes within their membranes.

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