AP BIOLOGY

Detailed explanation-1: -Since the protein that carries these ions from one side of the membrane to the other must pass through the membrane itself, it must be a transmembrane protein, meaning the answer is c).

Detailed explanation-2: -An acetylcholine receptor (green) forms a gated ion channel in the plasma membrane. This receptor is a membrane protein with an aqueous pore, meaning it allows soluble materials to travel across the plasma membrane when open.

Detailed explanation-3: -In short, ion channels are integral membrane proteins with characteristic features that allow them to assemble into multimolecular aggregates. Collectively, these structures allow channels to conduct ions, sense the transmembrane potential, inactivate, and bind to various neurotoxins.

Detailed explanation-4: -The two main forms of transmembrane proteins are channels and carriers. Channels form a constant pore across the plasma membrane and allow for fast diffusion of molecules.

Detailed explanation-5: -A transmembrane protein (TP) is a type of integral membrane protein that spans the entirety of the cell membrane. Many transmembrane proteins function as gateways to permit the transport of specific substances across the membrane.