AP Biology / Unit 2: Cell Structure and Function
2.10 Origins of Compartmentalization
Notes
Endosymbiotic theory: mitochondria and chloroplasts came from prokaryotes engulfed by an ancestral cell.
- Evidence: their own circular DNA, their own ribosomes (70S), double membranes, and binary-fission-like division.
Practice
Which supports endosymbiosis?
Like bacterial chromosomes.
Mitochondria likely came from:
Engulfed prokaryotes.
Chloroplasts and mitochondria reproduce by:
Like bacteria.
Ready for more? Take the Unit 2 test.