What organelles did Margulis propose were once independent bacteria?
Mitochondria and chloroplasts
Ribosomes and lysosomes
Nuclei and vacuoles
Golgi bodies and centrioles
Answer
Mitochondria and chloroplasts, organelles found in eukaryotic cells, were once independent bacteria. This theory, proposed by Lynn Margulis, suggests that these organelles originated as endosymbionts, bacteria that lived within larger cells and eventually became integrated into the host cell's structure. Mitochondria are responsible for cellular respiration, while chloroplasts carry out photosynthesis in plant cells.
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