Which statement about channel proteins is true?
A) They have a central pore of nonpolar amino acids.
B) They are integral membrane proteins.
C) They aid in active transport across a membrane.
D) They allow any substance to diffuse through a membrane.
E) They are anchored in a membrane by an outer coating of polar amino acids.

Question

Quizplus · Accepted Answer

Channel proteins are integral membrane proteins, meaning they are embedded within the lipid bilayer of a membrane. Choice A is incorrect because the central pore of channel proteins can contain polar amino acids as well as nonpolar amino acids. Choice C is incorrect because channel proteins facilitate passive transport across a membrane, not active transport. Choice D is incorrect because channel proteins are selective in what they allow to pass through their pore, depending on the size and charge of the substance. Choice E is incorrect because anchoring in a membrane is typically achieved through hydrophobic interactions, not polar interactions.

Which Statement About Channel Proteins Is True