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Vacuole

Membrane practice Test

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Membrane Practice Test AP Biology Choose the response which best completes the following statements or answers the following questions. 1. If a solution outside a cell is more concentrated so that the cell loses water to its environment,??the external solution is said to be __________ to the cell contents.??(1.) hypertonic (2.) in equilibrium (3.) isotonic (4.) hypotonic 2. Which mechanism requires energy? (1.) facilitated diffusion (2.) osmosis (3.) diffusion (4.) active transport 3. Pinching in of fluids by a unicellular organism is the process of (1.) phagocytosis (2.) osmosis (3.) pinocytosis??(4.) exocytosis (5.) facilitated diffusion

bio 211 quiz

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Study tips for Quiz 3 Fluid mosaic membrane model Selective permeability: control what goes in and out of cell Compartmentalization: different processes can be separate Phospholipids-main component of membranes (50% by weight) Structure: hydrophilic heads faces out (water loving) polar surface Hydrophobic tails face in (weather fearing) non-polar region Interior 1972 singer and Garth Fluid- lipids and proteins can move relative to each other within membrane The typical membrane structure consists of a phospholipid bilayer with a number of proteins scattered throughout, along with some carbohydrates (glycoproteins), glycolipids and sterols, similar to the way in which one does a mosaic tile, hence the name. molecules involved in membrane transport Pg 107 fig 5.12
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