Final answer:
Transmembrane proteins have a hydrophobic domain that anchors them in the plasma membrane, while surface proteins bind to the membrane through non-covalent interactions.
Step-by-step explanation:
Transmembrane proteins are integral membrane proteins that span the entire plasma membrane. They have a hydrophobic domain that interacts with the hydrophobic interior of the membrane, anchoring them in place. Surface proteins, on the other hand, are peripheral membrane proteins that bind to the membrane through non-covalent interactions with the polar phosphate groups of phospholipids or with the polar domains of integral membrane proteins.