00:01
Here we are dealing with the movement of either phospholipids or proteins in the cell membrane.
00:10
So within this phospholipid bilayer, we are looking at how the actual proteins or phospholipids will move.
00:19
And for this question, we are looking at which molecule will move the fastest.
00:25
So we know that the plasma membrane is constantly moving.
00:30
It's very dynamic.
00:31
That there is a constant change.
00:34
We see that the plasma membrane looks static at first glance, right? the boundaries of the cell aren't constantly changing, and the shape of the cell isn't erratic, so it's not just changing every second.
00:49
But if we take a closer look, we find that the actual constituent phospholipids that make up the phospholipid bilayer, that plasma membrane, are going to constantly be moving.
01:07
So if we label these 1, 2, and 3, we would find that after a few milliseconds here, you know, a little few milliseconds of time passed by, we find that the actual order might be 3, 1, and 2.
01:25
So we see that number 2 has moved to the right, 3 has moved all the way to the left, and 1 has moved to the right.
01:36
And there is actually going to be movement across the non -polar region as well.
01:47
So let's say 4, 5, and 6 are down here.
01:56
We might see that after a few more seconds, or a few more milliseconds, and we said that this was 4, 5, and 6 down here, we might see that we now have phospholipid number 5 up here.
02:21
So these two have switched.
02:25
However, the switching across the non -polar region is going to occur much less frequently than the movement laterally within the plane of the plasma membrane.
02:37
So moving between layers of the plasma membrane will occur...