Final answer:
The statement is true. Cell membranes are composed of tightly packed phospholipids, but may also contain proteins, cholesterol, and carbohydrate chains.
Step-by-step explanation:
True. Cell membranes are composed of phospholipids that form a bilayer, with their hydrophilic (water-loving) heads facing the outside and the inside of the cell and their hydrophobic (water-fearing) tails facing each other. The phospholipids are tightly packed, but the membrane also contains proteins, cholesterol, and carbohydrate chains.
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