Question

examine the structures in the diagram.
what is shown in the area labeled z?
carrier protein
phospholipid bilayer
phosphorus bilayer
receptor protein

Explanation:

In the cell membrane diagram: W/Y represent the phospholipid bilayer, X is a carrier protein (spans the bilayer for transport). Z labels proteins on the membrane surface that bind signals, which are receptor proteins. Carrier proteins span the full bilayer, distinguishing Z from them.

Answer:

D. receptor proteins