Question

What is the role of carrier proteins

Answer 1

The carrier proteins facilitate diffusion of molecules across the cell membrane. The protein is imbedded in the cell membrane and covers the entire membrane. This is important because the carrier must transport the molecule in and out of the cell.
Carrier proteins permit, but limit, the diffusion of particles across a cell membrane that is impermeable to them.They are a major type of protein used in facilitated diffusion, with the other being channel proteins. Unlike channel proteins that remain open for the passage of particles, carrier proteins are open on only one side at a time, accepting a single particle, closing on that side and opening on the other.