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Bellwork 1. What does it mean to be a selective person? 2. Which organelle protects a cell from its environment? 3. Which type of macromolecule is oil? http://www.wisegeek.org/what-is-membrane-permeability.htm Cell membranes have selective permeability. http://battleoftheorganelles.blogspot.com/2013/10/the-celebratory-cell-membrane-cause-its.html Cell membranes are selective permeability = allow certain materials to pass through. Selective permeability http://blog.sciencenet.cn/blog-355217-692895.html Selective permeability http://youtu.be/Pt4Ch-YW-xs The cell membrane is made up of many phospholipids. http://ourphysiologygroup.wikispaces.com/03+Cells+Interaction+with+Environment Cell membranes are selectively permeable. http://ourphysiologygroup.wikispaces.com/03+Cells+Interaction+with+Environment http://www.biology4kids.com/files/cell_membrane.html What do you know about oil and water? hydrophobic hydrophilic hydrophobic - hates water hydrophilic - likes water Cell Membrane The cell membrane is made up of tiny pieces called phospholipids. phospholipids look like this - - The cell membrane also has proteins in it that allow materials to go in and out of the cell. membrane proteins look like this. membrane proteins or this... Class Cell Membrane Model Today, we will be making a model of the cell membrane including: phospholipids membrane proteins Class Cell Membrane Model Every group of will make: 10 phospholipids 3 membrane proteins Use page 204 of your textbook. Phospholipid - label 2 of them