has been saved Question 10 of 20 Which of the following are thought to have been engulfed by prokaryotic cells and evolved into chloroplasts? O ribosomes O protozoa O photosynthetic bacteria O mitochondria
Biology · Middle School · Thu Feb 04 2021
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The mitochondrion and the chloroplast are both organelles that were once free-living cells. They were prokaryotes that ended up inside of host cells.
Mitochondria and chloroplasts likely evolved from engulfed prokaryotes that once lived as independent organisms. At some point, a eukaryotic cell engulfed an aerobic prokaryote, which then formed an endosymbiotic relationship with the host eukaryote, gradually developing into a mitochondrion.