Think about the bilayer arrangement of phospholipids in cell membranes. Now imagine if extracellular and intracellular fluids were made of oil instead of water. How would the phospholipids arrange themselves?
A. The hydrophilic heads would be oriented toward the middle, with hydrophobic tails pointing outward.
B. The hydrophobic tails would be oriented inward, while the hydrophilic heads would point outward.
C. The hydrophobic heads would be oriented toward the oil, so outward; the hydrophilic tails would be pointed inward.
Answer: A
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