BMSC 207 Module 2 Test Questions with Correct Answers

What are the four functions of the cell membrane? Physical isolation (barrier), regulation of exchange with the environment, communication between the cell and its environment, structural support Metabolically active membranes contain more of what macronutrient? protein What are the three types of lipids found in cell membranes? phospholipid, sphingolipid, cholesterol what is an amphipathic molecule? A molecule that has a hydrophilic and hydrophobic end. Example: phospholipids micelles droplets of phospholipids important in lipid digestion liposomes Membrane-bound droplets that form when lipids are added to water, aqueous center integral proteins penetrate the hydrophobic interior of the lipid bilayer, transmembrane and lipid-anchored peripheral proteins bound to the surface of the membrane, can be removed without disrupting the cell membrane Lipid rafts associated with sphingolipids since they are longer and naturally group together what substance determines the viscosity of a phospholipid bilayer? cholesterol glycoprotein A protein with one or more carbohydrates covalently attached to it, used for cell to cell recognition glycolipid a lipid with one or more covalently attached carbohydrates, used in cell to cell recognition Where is most of the body's water content found? inside the cells