[Solved] a. What is a fee simple? b. What is a life estate? c. If Ed grants a life estate to his wife, what interest does he retain? Explain. Light Microscope: An instrument that uses visible light and magnifying lenses to examine small objects not visible to the naked eye. Phospholipids: A class of lipids that are a major component of all cell membranes, forming lipid bilayers due to their amphipathic properties. Cholesterol: A lipid molecule that is essential for the formation of cell membranes, production of hormones, and synthesis of vitamin D. Glycolipids: Lipids with a carbohydrate attached, important in cell recognition and membrane structure.