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Cell Membrane: Use the cell defense membrane app to help you answer the questions below. The cell membrane is also called the… Which molecules cannot pass through the membrane easily? Why? Why do cells depend on the cell membrane? What are channel proteins? What purpose do they serve? What will happen if the cell membrane doesn’t function properly? In which direction do molecules move? Draw and label the cell membrane. This is called _________________. When channel proteins are used it is called Diagram a phospholipid and label and define the hydrophilic head and hydrophobic tail. What role does cholesterol play in the membrane? What does selectively permeable mean? Why is this important? ______________ diffusion. If a cell wants to move a substance from an area of low concentration to an area of high concentration, what does it need? When substances are moved “against the flow” this is called ___________________________________. _______________ proteins and ________ (energy) are used. What purpose do carbohydrates serve? What did you observe? Why can these substances pass through easily? Why are carbohydrates important to the immune system?