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) the DNA inside organelles is not made of the same four bases as the DNA in the host cells
B) organelles float around independently inside eukaryotic cells
C) prokaryotes are seen incorporating into cells today
D) organelles are very similar to present-day bacteria, suggesting a common ancestor

Question

Quizplus · Accepted Answer

The fact that organelles such as mitochondria and chloroplasts are very similar to present-day bacteria suggests that they share a common ancestry. This is a strong piece of evidence to support the idea that these organelles were once independent prokaryotes that were engulfed by eukaryotic cells and evolved into the specialized, membrane-bound organelles that we see today.

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