00:01
The movement of molecules from a region of low to high concentration is called osmosis, diffusion, active transport, or imbibition.
00:17
Okay, so three of these are possible forms of transport you might see.
00:22
One of them is not.
00:23
So i can first rule out d, so that's not a form of transport you might see of molecules, the other three you might see.
00:31
So let's say you have a membrane and it's split between two areas.
00:38
One is low concentration and the other is high concentration.
00:44
Now this gives us a concentration gradient and the passive response of these molecules is to move from high to low.
00:59
So if this happens, this is passive.
01:02
To go the other way, what we're actually looking at from low to high, requires the input of energy.
01:08
And that's the key to this question...