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Chapter_4 - Chapter 4: Cell Membrane structure and function...

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Chapter 4: Cell Membrane structure and function Pages 56-73 Cell membrane functions: 1. 2. 3. Cell membrane structure Fluid Mosaic Model of Membranes: Types of Membrane Proteins I. Transport proteins Types of transport proteins: a. Channel proteins allows molecules down their concentration gradients b. Carrier proteins change shape to carry other molecules down their concentration gradient II. Receptor proteins a. trigger responses when specific moles attach III. Recognition proteins a. id tags and attachment site Example of a recognition protein: How Do Substances Move Across Membranes? Transport Processes I. Passive transport does not require energy. Types of passive transport: 1.simple diffusion- no proteins 2. facilitated diffusion requires proteins 3.osmosis – movement of water Passive transport 1: Simple Diffusion Molecules move randomly “downhill” from area of high concentration to area of low concentration down a concentration gradient. After time concentrations become equal
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Chapter_4 - Chapter 4: Cell Membrane structure and function...

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