Plant cells are the solution. They have found an organism that is the size of a chloroplast and has its DNA on planet X586, which is located in a galaxy far, far away. It can endure without a host by itself. This organism resembles a plant cell the most.
The new organism fits within the range of a chloroplast in size. A few microns in diameter, a chloroplast is an organelle. The endosymbiotic hypothesis for the birthplace of mitochondria and chloroplasts postulates that mitochondria are descended from specialised bacteria (likely purple nonsulfur bacteria) that managed to evade endocytosis by some other species of a prokaryote or a different cell type and integrated into the cytoplasm.
Thus, we might conclude that plant cells are the answer. They have discovered an organism that most closely resembles a plant cell.
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