6- OsmosisandDiffusion_Review Sheet

6- OsmosisandDiffusion_Review Sheet - Osmosis and Diffusion...

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Osmosis and Diffusion - Exercise 6 Review Sheet Where is the plasma membrane located in animal cells? Plant cells? Ouside of animal cell. Under cell wall for plant cells The plasma membrane is said to be a lipid bilayer. What does that mean? Two layers of phosopholipids. Each layer has a polar head and non polar tail. The polar head is hydrophilic and the non polar tail is hydrophobic. The non polar tails of each layer face eachother. Phospholipids are polar at which end? Nonpolar at which end? How do they orient in the plasma membrane? Polar at head, non polar at tail. Polar molecules can cross the plasma membrane but non polar molecules must use transport poteins. What are the four (4) transport methods by which materials can cross the plasma membrane? Can you define each? Diffusion, osmosis, facilitated diffusion, and active transport. Diffusion- passive transport of particles Net movement of particles of a substance from the regions of greater free energy to regions of lower free energy for the substance. Molecules are always in motion. They move from an area of higher concentration to an area of lower concentration. In other words down their concentration gradient. Contunuies to diffuse until concentrations are equal. Osmosis- passive transport of water Diffusion of water molecules across the plasma membrane. Hypotonic, hypertonic, isotonic. Net movement of water. Facilitated diffuson Relies on transport proteins to bind and carry substances theough tunnal channels in the plasma membrane. Active transport
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6- OsmosisandDiffusion_Review Sheet - Osmosis and Diffusion...

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