Understand endosymbiotic theory - AP Biology

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Question

The Endosymbiotic Theory posits that, before being engulfed by a eukaryotic cell, they were

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Answer

The Endosymbiotic Theory states that the mitochondria and chloroplast in eukaryotic cells were once aerobic bacteria (prokaryote) that were ingested by a large anaerobic bacteria (prokaryote). The aerobic bacteria were initially free-living prokaryotes, before being ingested by anaerobic bacteria.

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