Scenario The first prokaryotic cells gave rise to eukaryotic cells approximately 1.7 billion years ago. The structure of eukaryotic cells today suggests how they might have evolved from their prokaryotic ancestors. Scientists examining mitochondria and chloroplasts now think that these organelles were probably free-living prokaryotes before becoming a part of eukaryotic cells long ago. -What evidence suggests that mitochondria might have evolved before chloroplasts? A)Mitochondria can sometimes divide to produce chloroplasts. B)Only mitochondria have their own DNA. C)Some mitochondria have chloroplasts inside of them. D)Almost all eukaryotes have mitochondria but only some cells have chloroplasts.

Question

Quizplus · Accepted Answer

Almost all eukaryotes have mitochondria, suggesting they evolved earlier, while only some eukaryotes, specifically plants and algae, have chloroplasts.

Scenario The First Prokaryotic Cells Gave Rise to Eukaryotic Cells Approximately