Final answer:c) Liposomes are closed lipid bilayer spheres that can encapsulate substances for targeted delivery to specific tissues and cells, highly valuable in medical applications.Explanation:Closed lipid bilayer spheres that encapsulate ingredients and target their delivery to specific tissues are known as liposomes. Liposomes are artificial vesicular structures that can be filled with a variety of substances, such as drugs, nucleic acids, and proteins.They are designed to fuse with cell membranes and release their contents into the target cells, which makes them highly valuable for medical applications including targeted drug delivery. The properties of liposomes, such as charge density and membrane fluidity, are determined by their lipid composition and size. Furthermore, liposomes can be unilamellar with a single bilayer or multilamellar with multiple bilayers, similar to the layers of an onion....

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