Which organelles are believed to have originated from free-standing bacteria ingested by ancient eukaryotic cells? chloroplasts and ribosomes lysosomes and ribosomes mitochondria and chloroplasts mitochondria and golgi complex chloroplasts and lysosomes?

The endosymbiotic theory states that the some cellular organelles present inside the Eukaryotic cells were once free-living prokaryotic organisms. The eukaryotic cells ingested these organisms and over time they developed a symbiotic relationship with each other. These organelles include the mitochondria and the chloroplasts. Both these organelles contain their own DNA, and produce energy.

Hence, the answer is 'mitochondria and chloroplasts'.

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