Amphipathic Phospholipids Form Bilayer Vesicles

Steps:

• Phospholipids have hydrophilic heads and hydrophobic tails, driving self-assembly in water.
• Tails cluster away from water, while heads face aqueous environments.
• Liposomes are spherical structures with a phospholipid bilayer enclosing an aqueous interior.
• Cross-section reveals tails inside the bilayer, heads on both surfaces.

Why C is correct:

• It shows a bilayer with hydrophobic tails inward (between layers) and hydrophilic heads facing water inside/outside, per amphipathic molecule assembly in aqueous solutions.

Why the others are wrong:

• A: Depicts a monolayer with all heads outward, ignoring enclosed aqueous space.
• B: Shows tails outward, violating hydrophobic avoidance of water.
• D: Illustrates random clustering, not organized bilayer structure.

Final answer: C