AP BIOLOGY

Detailed explanation-1: -Enzyme receptors embedded in the membrane.

Detailed explanation-2: -Integral proteins are embedded in the phospholipid bilayer, and also called transmembrane proteins. Often times these integral proteins serve as channels through which molecules move across the cell membrane.

Detailed explanation-3: -Gases, hydrophobic molecules, and small polar uncharged molecules can diffuse through phospholipid bilayers. Larger polar molecules and charged molecules cannot.

Detailed explanation-4: -Integral membrane proteins are embedded directly within the lipid bilayer. Peripheral membrane proteins are not inserted into the lipid bilayer but are associated with the membrane indirectly, generally by interactions with integral membrane proteins.