00:01
This question is asking us, why do we see atp synthase? why might we see atp synthase in prokaryotes, chloroplasts, which of course would be found in plants, and mitochondria, which are found in eukaryotic organisms? why do we see atp synthase in all three of these very different types of organisms? atp synthase is a membrane protein.
00:39
It's a protein that sits on the membranes, and it essentially turns adp into atp.
00:46
That's what's called atp synthase.
00:48
And we see it on the membranes of prokaryotes.
00:52
We see it on the membranes of chloroplast, and we see it on the membranes of mitochondria.
00:57
Why might we see a similarity there in evolutionary terms? that's what this question is asked.
01:03
And the prevailing theory that it's wanting you to get at is called endosymbiosis.
01:19
Indosymbiosis.
01:21
Essentially, there's four steps, or we'll break it down into two steps.
01:27
We have our cell.
01:30
Okay, we'll draw it as pac -man because essentially what endosemiosis says is that a certain cell, it could be any type of cell.
01:38
We'll call it the host cell.
01:41
Eight, a bacterial or prokaryotic cell, some kind of bacterium, and consumed it to where now we've got that.
01:55
We'll do that one in red, actually.
01:58
Now we've got that inside there...