AP Biologyeasymcq1 pt
The endosymbiotic theory proposes that chloroplasts evolved from
A.engulfed photosynthetic prokaryotes
B.folding of the nuclear envelope
C.aerobic heterotrophic bacteria
D.viruses that infected plants
Explanation
Core Concept
An ancestral cyanobacterium-like cell was engulfed and kept, eventually becoming the chloroplast. Its own DNA and ribosomes persist as relics of that independence.
Correct Answer
Aengulfed photosynthetic prokaryotes
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