[Solved] A virtual image can be seen directly with the naked eye. Plasma Membrane: The lipid bilayer that encloses the cytoplasm of a cell, serving as a barrier and gateway for substances entering and leaving the cell. Absorptive State: Immediately after a meal when nutrients are being absorbed from the intestine into the circulatory system. Protein: Large biomolecules consisting of one or more long chains of amino acid residues, essential for the structure, function, and regulation of the body's tissues and organs. Glucose: A primary sugar vital for energy in living organisms and a constituent of multiple carbohydrate types.