* Mitochondria have their own ribosomes: Mitochondria are unique in that they have their own DNA and their own ribosomes, called mitochondrial ribosomes (mitoribosomes).

* Number varies: The number of ribosomes in a mitochondrion can vary depending on the type of cell, its metabolic activity, and other factors.

* 705 is unlikely: It's highly unlikely that a mitochondrion would have exactly 705 ribosomes. There's no known standard number for the number of mitoribosomes.

To summarize: While mitochondria do have ribosomes, there's no fixed number like 705. The actual number can fluctuate depending on the cell and its needs.