The cell surface membrane is a highly dynamic structure composed of various lipids, proteins, and carbohydrates arranged in a fluid mosaic.
Which of the following statements is not a correct description of the structure or function of a membrane component?
Cholesterol molecules fit between the phospholipid fatty acid tails, restricting their lateral movement at high temperatures to stabilize the membrane, while preventing them from packing too closely at low temperatures to maintain fluidity.
Glycolipids consist of carbohydrate chains covalently bonded to lipids on the outer monolayer of the membrane, where they act as recognition sites and help stabilize the membrane structure by forming hydrogen bonds with surrounding water molecules.
Carrier proteins are intrinsic membrane proteins that undergo shape changes to transport specific polar molecules or ions across the membrane, a process that always requires metabolic energy in the form of ATP.
Channel proteins are water-filled tubes that span the membrane, allowing specific water-soluble ions to diffuse down their concentration gradient without the expenditure of metabolic energy.
