Mouse fibroblast cells will artificially take up isolated chloroplasts, and the latter will remain functional for a time. The same can be done for mitochondria. There are ciliated protozoa with chloroplasts and eye spots. There are obvious possible ecological values for endosymbiotic relationships. Factors in favor of mitochondrial and chloroplast endosymbiosis.
Outer membrane is similar to the plasma membrane.
Both have prokaryotic type and size ribosomes . Inner membrane lipids of mitochondria and chloroplasts are similar to their prokaryotic counterparts. Mitochondria and chloroplasts seem to divide independently of the rest of the eukaryotic cell. Eukaryotes are very good at endocytosis . Mitochondria and chloroplasts only code for a few proteins.