Did the ancestral eukaryotic cell with its nucleus and other organelles evolve first and then some eukaryotes got mitochondria or did the ancestral eukaryotic cell have mitochondria, according to SET?

Answer 1

According to SET mitochondria evolved first and the fact that almost all eukaryotes have mitochondria supports this suggestion

Answer 2

It is believed that bacteria (prokaryotes) form a symbiotic relationship with eukaryotic cells. Theses small prokaryotes became a part of eukaryotes becoming the powerhouse. The powerhouse of the cukaryotic cells are known as mitochondria.