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Paper 2 style question on topic 1.3 Membrane structure
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Use the buttons to review the topic, try a paper 2 style question and check your answer.
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<h3 id="header-4">1.3 <img alt="" class="left" src="../../../biology/images/01_cells/membrane_v2.jpg" style="width: 250px; height: 166px; float: right;" title="Image by David Faure 2012">Membrane structure</h3>
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<li class="liWithoutP">Phospholipids form bilayers in water due to the amphipathic properties of phospholipid molecules.</li>
<li>Membrane proteins are diverse in terms of structure, position in the membrane and function.</li>
<li>Cholesterol is a component of animal cell membranes.</li>
<li>Particles move across membranes by simple diffusion, facilitated diffusion, osmosis and active transport.</li>
<li>Application: Cholesterol in mammalian membranes reduces membrane fluidity and permeability to some solutes.</li>
<li>Can you draw a diagram of the fluid mosaic model?</li>
<li>Can you explain how evidence from electron microscopy led to the proposal of the Davson-Danielli model?</li>
<li>Can you outline the evidence which led to the falsification of the Davson-Danielli model and support of the Singer-Nicolson model?</li>
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<p><strong>Skills </strong> </p>
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<li>Application: Cholesterol in mammalian membranes reduces membrane fluidity and permeability to some solutes.</li>
<li>Skill: Drawing of the fluid mosaic model.</li>
<li>Skill: Analysis of evidence from electron microscopy that led to the proposal of the Davson-Danielli model.</li>
<li>Skill: Analysis of the falsification of the Davson-Danielli model that led to the Singer-Nicolson model.</li>
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