Study Guide for 2nd Exam of 101 Caroline.docx

C intercellular junctions chapter 7 membrane

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c) Intercellular junctions Chapter-7- Membrane Structure and function 1. Plasma membrane, Selective permeability, Amphipathic molecules, fluid mosaic model, Peripheral and Integral proteins, glycolipids and glycoproteins? Plasma membrane is made up of a phospholipid bilayer and is selectively permeable to substances of different sizes, shapes, or temperatures. Amphipathic molecules are…. The fluid mosaic model represents… peripheral proteins are on the outside surface of the cell membrane connected to the phospholipids and is used for cell recognition. The integral proteins are within the phospholipid bilayer and provide a passage way through the cell membrane to the inside of the cell. Glycolipids are…. Glycoproteins are… 2. Six functions of membrane proteins? 1) cellular communications 2) structural support 3)storage 4)transport 5)movement 6)defense against foreign substances 3. Passive transport (Diffusion), , Osmosis, Isotonic (cell flaccid), hypertonic,( cell plasmolysis), hypotonic (turgid), osmoregulation. (Draw diagrams below without looking at the powerpoint, as a way of revision) passive transport is when no energy is used for particle movement. Diffusion is when particles move from an area of high concentration to low concentration down the concentration gradient. Osmosis uses active transport when energy is used to push particles against the concentration gradient from low conc. to high conc. Isotonic is when concentration is equal
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on both sides of membrane. Hypertonic is when conc. is higher on outside and hypotonic is when conc. is lower on outside 4. Facilitated Diffusion [ Channel proteins, ( Ion channel, Aquaporin), Carrier protein) ] When energy is used to push from high conc. to low conc. thru channel proteins 5. Active Transport(ATP)- Membrane potential, electrochemical gradient, Electrogenic pump, Na-K pump(animals), Proton pump (Plants), Cotransport ………….Cotransport is when particles diffuse into cell and pick up hydrogen on the way in to increase conc. inside cell and then then particle diffuses back outside of cell and loses hydrogen on the way out. 6. Exocytosis, Endocytosis- 1. Phagocytosis, 2. pinocytosis, 3. receptor mediated endocytosis, what is unique to each one of these three? Exocytosis is when a vacuole moves particles to the edge of cell and releases them thru membrane. Endocytosis is when vacuole forms around particles to bring them into the cell. 1) phagocytosis is when particles are brought into cell by “false feet” reaching out and bringing them in thru a vacuole. 2) pinocytosis is when particles move closer to cell and are brought in by a vacuole forming aroung them 3) receptor mediated endocytosis is when there are “locks” in vacuole that have to be “unlocked” by the “keys”
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