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Unformatted text preview: attach. 3. Recognition Proteins: ID tags & attachment sites. Glycoprotein’s: Proteins with sugars attached. How Do Substances Move Across Membranes? Membranes are selectively permeable. Pg. 58 Transport Processes Passive transport: no energy required. Types: o 1. Simple diffusion: no proteins. o 2. Facilitated diffusion: requires proteins. o 3. Osmosis: movement of water. Table 4-1 Diffusion Molecules move randomly. Movement is from area of high concentration to area of low concentration. Down concentration gradient. o After time concentrations become equal. Figure 4-2 pg. 61 Passive Transport 1. Simple Diffusion: Small Molecules. 2. Facilitated Diffusion: Channels; small, charged. E.g., ions. 3. Osmosis: Water defusing across a differentially permeable membrane....
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