Which statement regarding channel proteins shown in the figure is false? a. Channel proteins can assist polar molecules to cross the plasma membrane by facilitated diffusion. b. The gated ion channel can allow ions to pass when stimulated to open. c. The surface of a channel protein in contact with the bilayer would likely have hydrophilic amino acids. d. Aquaporins are channel proteins that facilitate the diffusion of water across membranes.
Channel proteins are proteins found in the transmembrane region of the plasma membrane. They help in the movement of molecules down the concentration gradient, that is, from high to low concentration.
They do not require any energy to carry out their function. This is a passive transport and they don't need to bind with these molecules to be moved across either.
Thus, channel proteins carry out facilitated diffusion where polar molecules are moved across the membrane through them.
Each channel protein is made up of specific amino acid sequences that determine which molecules it will transport.
These proteins also have a property of being either gated or non-gated. Non-gated ones always remain open whereas the gated ion channel have a binding site and will allow ions to pass through only when a certain stimuli to open is generated by a ligand upon binding to this site.
Some examples of channel proteins are: the Voltage gated potassium channels, Voltage gated sodium channels, Aquaporins.
Aquaporins are examples of a kind of channel proteins that facilitate transport of water across membranes.
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