SAC 1

[Stick]

I just wanted to confirm something. I have my first Biology SAC on Monday investigating the movement of materials across a membrane and I was wondering if its important to note the following:
- the process of creating a protein for transport out of the cell
- connections between cells that allow the transport of substances
To be safe, I've decided to revise it all. I haven't been given much detail about this SAC but given its name, I've given it the benefit of the doubt and have assumed it will cover the above two aspects. Just to state the obvious here, I also covered the plasma membrane itself, the fluid mosaic model, the role of membranes in cells and organelles, simple diffusion, channel-mediated diffusion, facilitated diffusion, active transport, bulk transport, osmosis and the cell wall.

[Shenz0r]

I never recalled having revised those two areas before my first SAC. You'll be fine.

[Stick]

I was thinking the same thing, but those two areas do technically involve the movement of materials across a membrane.

[pi]

Have you covered the roles of components of the membrane? Just to make sure

[Snorlax]

Just curious...What's Channel-mediated diffusion?

[Stick]

Have you covered the roles of components of the membrane? Just to make sure

Yeah, done that too.

Just curious...What's Channel-mediated diffusion?

It's when a substance needs to use a protein channel to move across the plasma membrane. It differs from facilitated diffusion in that facilitated diffusion also involves a specific carrier protein to move a substance down a protein channel. Both are passive forms of transport.

[Snorlax]

It's when a substance needs to use a protein channel to move across the plasma membrane. It differs from facilitated diffusion in that facilitated diffusion also involves a specific carrier protein to move a substance down a protein channel. Both are passive forms of transport.

That's hella confusing..hahaha
I'll ask my teacher about that.

[Stick]

Here's a helpful image:

[Snorlax]

Here's a helpful image:

(Image removed from quote.)

Ahh i get you...
A channel protein

[Bad Student]

In Biozone, carrier mediated diffusion and channel mediated diffusion are both classified as types of facilitated diffusion.

[Yacoubb]

So really the difference between Channel Mediated and Facilitated Diffusion is that facilitated diffusion involves the use of a carrier protein molecule to transport the material across the protein channel, whereas channel mediated transport involves merely the transport of the substances directly across the protein channel.

[Scooby]

So really the difference between Channel Mediated and Facilitated Diffusion is that facilitated diffusion involves the use of a carrier protein molecule to transport the material across the protein channel, whereas channel mediated transport involves merely the transport of the substances directly across the protein channel.

Channel-mediated facilitated diffusion is a type of facilitated diffusion

[Stick]

Ah. Thanks for clearing that up.