00:01
Let's take a quick look at the structure of our plasma membranes here.
00:05
So we have a few different options to choose from.
00:07
We'll go through them one by one.
00:09
So let's start right over here.
00:11
Looks like we have a bi layer of phospholipids.
00:15
So that's good.
00:16
We like that.
00:17
But the issue here is that these proteins are inside the bi layer.
00:24
And that leads to a couple problems.
00:26
First of all, the proteins depend on the ability to interact with molecules inside the cell and out of the cell.
00:32
So if they're sandwiched between this bilayer, the molecules that might have needed to get to the proteins can't.
00:40
So that's already a no go there.
00:43
So we know it can't be this model.
00:47
We'll move on right over here.
00:50
And this is looking pretty good.
00:51
We have our phospholipid bilayer.
00:53
We have protein channel.
00:57
That's what we call a transmembrane protein.
00:59
We have this peripheral protein here.
01:02
And it's looking pretty good.
01:03
It has all the components pretty much that we need for a plasma membrane.
01:08
So we'll come back to that once we have a look at the rest of the models...
