What is the main structural difference between liposomes and lipid bilayers?

• A. Liposomes are larger than lipid bilayers.
• B. Liposomes are composed of proteins, while lipid bilayers are not.
• C. Liposomes have a hydrophobic core, while lipid bilayers do not.
• D. Liposomes have an aqueous core, while lipid bilayers do not.

Answer: (D)