In fact, these organelles are descendants of symbiotic bacteria living inside the eukaryote host. They have become so dependent on their host that they can no longer live outside. This may also be the case with MTOCs, although the evidence is less clear in this case. Sometimes the winning strategy is cooperation. Two cells are shown, with both nuclei visible, as well as the thin junction between the cells.
Many mitochondria are present, along with abundant endoplasmic reticulum.
The transmission electron micrograph was provided by Errol Kepkep. For some more excellent images of eukaryote cell ultrastructure, taken from plant cells, check out the eukaryotic cell images at the University of Wisconsin gopher.