Diffusion.... (A) Can occur across the membrane or be...

Diffusion.... (A) Can occur across the membrane or be facilitated with an integral transport protein (B) requires an expenditure of energy by the cell. (C) is a passive process in which molecules move from a region of higher concentration to a region of lower concentration. A & C are correct All of these are correct

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00:01 We're looking at diffusion, and which of these are true about it? a, it can occur across the membrane or be facilitated with an integral transport protein.

00:13 B, it requires an expenditure of energy by the cell.

00:18 Or c, it is a passive process where they go from higher to lower concentration.

00:25 And then we have the bonus options, a and c, or, or.

00:33 So let's look at these three.

00:35 So first of all, diffusion.

00:36 Diffusion is a passive process.

00:40 So it does not require the inputs of energy.

00:43 So we can rule out b and we can say that c is true.

00:47 It's passive because it's going from high to low concentration.

00:52 High to low is passive.

00:55 If we were going the other way, low to high, this would be an active process.

01:02 And we would need to put some energy in to do this.

01:05 That's about what about a? can it occur across the membrane or be facilitated with an integral transport protein? well, this is also true.

01:13 So the answer is both a and the.

01:15 So there are two types of diffusion that we're usually looking at, and they are called simple and facilitated.

01:24 So simple means that the molecule doesn't need any help, it diffuses directly across the membrane...

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