08. Facilitated diffusion - Channel and carrier proteins

What do channel proteins have?

Pores lined with polar groups (hydrophilic) allowing charged ions to pass

Describe the types of channel proteins

Each channel protein is specific for one type of ion

How do the channel proteins function?

Open and close depending on needs of cell -> called gated channels

What do carrier proteins allow?

Allow facilitated diffusion across membranes of larger polar molecules e.g. sugars + amino acids

how do carrier proteins function?

Particular molecule attaches to carrier protein at binding site

What does a molecule attaching to carrier protein binding site cause?

Causes carrier protein to change shape / rotate in membrane -> This release molecule onto other side of membrane