For carrier protein all you need to know is:
- Different carrier proteins facilitate diffusion of different molecules
- Carrier proteins transport large molecules in and out of the cell
- Down a concentration gradient i.e. from high to low concentration
- the process starts by large molecule attaching to carrier protein
- The protein then changes shape
- Which releases molecule on opposite side of membrane
- it's a passive process - no energy is used
And for protein channels:
- Different protein channels facilitate diffusion of different charged particles
- Protein channels form pores in the membrane
- For charged particles
- Down a concentration gradient
- This is also passive
I hope I haven't missed anything important out