MEMBRANES AND TRANSPORT 5.0 / 5 based on 1 rating ? BiologyCellular processesASWJEC Created by: aking1234Created on: 12-01-17 11:50 How thick is the cell membrane? 7 nm 1 of 28 what is the role of cholesterol in the membrane? To provide stability and fluidity 2 of 28 Do cell membranes have antigens and receptor sites on them for hormone attachement and cell recognition? Yes 3 of 28 What happens when you increase the temperature of a cell? Molecules gain kinetic energy, move faster, membrane becomes more fluid, mre permeable, therefore more olecules pass in and out 4 of 28 Whice of these cannot diffuse across the cell membrane? Ions 5 of 28 What happens when a polysaccharide joins to a extrinsic protein or a phospholipid? A glycoprotein or glycolipid is formed 6 of 28 In passive tranport do the molecules have kinetic energy and is ATP required? Yes and No 7 of 28 Whice of these does not effeect the rate of diffusion? Size of the hole 8 of 28 What is the definition of water potential? Water potntial is the tendency of water molecule to leave or enter a system. From dilute solution to a ion concentrated solution 9 of 28 What is the unit for water potential? Psi = kPa 10 of 28 What is the water potential of pure water? 0 kPa 11 of 28 Is water a universal solvent? Yes 12 of 28 What is a HYPERTONIC SOLUTION? Solution that have a lower ater potential than the cell cytoplasm, it contains more solutes 13 of 28 What directon does water move in via osmosis? From a high water potential to a low water potential 14 of 28 Name two solutes sugar and salt 15 of 28 What is another word for a hypotonic solution? More dilute 16 of 28 What happens if a red blood cell is placed in a hypertonic solution? It is crenated 17 of 28 Is this the formular for water potential . Psi = Solute potential + pressure potential Yes 18 of 28 When water enters a plants cell vacuole via osmosis what pressure pushs outwards on the cell wall? Hydrostatic 19 of 28 What does a group of cells at incipient plasmolysis look like? 50% of the cells are plasmolysed 20 of 28 What is the preessure potential of a plant cell in an isotonic solution? 0 kPa 21 of 28 When a cell is in a hypotonic solution and is turgid what is the pressure potential if the solute potential is 120 kPa? - 120 kPa 22 of 28 If the water potential is 50 kPa andthe solute potential is 15 kPa what is the pressure potential? 35 kPa 23 of 28 Is ATP required for facilitated diffusion? No 24 of 28 Where does facilitated diffusion occur? Channel and carrier proteins 25 of 28 What is facilated diffusion limited by? The availability of proteins 26 of 28 What kind of site does a carrier protein have? A binding site 27 of 28 What is the definition of active transport? The movement of ions against the concentration gradient, from low to high concentration using ATP. 28 of 28
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