Mitochondria, the energy-processing organelles in eukaryotic cells, have their own DNA, separate from that of the cell's nucleus. Which of the following choices best explains the presence of mitochondria in eukaryotic cells?
A) An ancestral prokaryote engulfed and retained a separate energy-processing prokaryotic cell.
B) Mitochondria are formed when a eukaryotic cell undergoes fission.
C) Mitochondria are separate organisms that fuse with eukaryotic cells in much the same fashion as algae and fungi form lichens.
D) A prokaryote and a eukaryote fuse to form mitochondria.
Correct Answer:
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