Are mitochondria in prokaryotes and eukaryotes the same?

[sixpence]

In terms of genes present? Also, do they have the same mt ribosomal subunits? This site
http://users.rcn.com/jkimball.ma.ultran ... somes.html

does not distinguish between mt ribosomes from pro or eukaryotes...

[JackBean]

that's maybe because prokaryota do not have mitochondria (and any organelles)

[jwalin]

prokaryotes don't have any membrane bound organelles

[jwalin]

ribosomes in prokaryotes have 70s (in easier terms smaller) ribosomes, while the eukaryotes have 80s (larger)

[jwalin]

some consider that if a prokaryote could engulfe another then that led us having the mitochondria (it being the engulfed prokaryote)

note: i stress upon the "consider"

[JackBean]

why can't you just post it into one post? You can edit them, so there is no need to write brand new posts!

[jwalin]

good idea

but just for the sake of clarity
but next time i will put it in one post

[mkwaje]

I agree with the previous post that some people 'consider' the mitochondria as an ancient prokaryote engulfed by another and what resulted was a symbiotic relationship. That is how they theorized the formation of the other organelles, like chloroplasts inside eukaryotic cells. One thing that supports this thoery is the presence of mitochondrial DNA. And the chloroplasts have DNA too, even its own ribosomes and RNA! Its like another cell living inside another cell...

So to answer the question, there are no mitochondria in prokaryotes but the mitochondria itself maybe an ancient form of prokaryote.