In both plant and animal cells, certain organelles exhibit similarities to bacteria in terms of structure and origin, largely due to the endosymbiotic theory. The organelles that resemble bacteria are:
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Mitochondria: These are the energy-producing organelles found in almost all eukaryotic cells, including plant and animal cells. Mitochondria have their own circular DNA, similar to bacterial DNA, and double membranes, which supports the idea that they originated from ancient prokaryotic cells through a symbiotic relationship.
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Chloroplasts: Found in plant cells and some protists, chloroplasts are responsible for photosynthesis. Like mitochondria, they also have circular DNA and resemble bacteria in their structure and function, providing further evidence linking them to an endosymbiotic origin.
Both mitochondria and chloroplasts share features with prokaryotic cells, reinforcing their evolutionary connection through endosymbiosis.