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The Cell Membrane is a Fluid Mosaic. A cell is the basic unit of life, and all organisms are made up of one or many cells. One of the things that all cells have in common is a cell membrane. It is a barrier that separates a cell from its surrounding environment. This outer boundary of the cell is also called the plasma membrane.
cell membrane selective permeability phospholipid receptor fluid mosaic model Circle the correct word from the choices below. 1. Which material has selective permeability, a sponge or a shovel? 2. Which contains the other, cell membrane or phospholipid? 3. Which receives signals, a fluid mosaic model or a receptor? 4. What does the cell membrane do for the cell? 5. Describe how the phospholipids are arranged in the cell membrane. 6. Do cells respond to every signal? Explain. 7. Explain how a tea bag is an example of selective permeability. 3.3 Vocabulary Check Go back and highlight each sentence that has a vocabulary word in bold. Mark It Up 3.3 The Big Picture Molecules that cannot enter the cell bind to receptors in the membrane. When bound, the receptor transmits the sig-