Cell membranes 2.5 / 5 based on 2 ratings ? BiologyCell membranesASEdexcel Created by: francesca_321Created on: 09-04-15 10:45 What charge do phospholipids have? POLAR 1 of 30 What properties do phospholipids have? hydrophillic head and hydrophobic tail 2 of 30 What implications does this cause the membrane? Two different responses to water 3 of 30 What happens when a phospholipid is suspended in water? They form bilayers with hydrophobic tails inside and hydrophillic heads outside 4 of 30 What is the size of a monofilm layer of phospholipids when compared to the surface area of a cell? The film was twice as large as the cell surface area 5 of 30 Where are carbohydrates found on the model? On the outside 6 of 30 What molecules does diffusion let through? Small or non polar lipid soluble molecules 7 of 30 for example? Oxygen or carbon dioxide 8 of 30 How do the molecules move through the membrane? Directly through the phospholipid bilayer 9 of 30 What form of movement is this? Passive 10 of 30 What is the movement of the water like? net movement down concentration gradient 11 of 30 What is needed for facilitated diffusion? Channel protein 12 of 30 What is osmosis diffusion of? free water molecules 13 of 30 What kind of movement is it? Net movement 14 of 30 from what kind of solution? A solution with a lower solute concentration 15 of 30 Through what kind of membrane? Partially permeable membrane 16 of 30 Where does active transport occur? In the carrier protein 17 of 30 What is needed for active transport? Break down of ATP 18 of 30 Where does it occur? Up a concentration gradient 19 of 30 What is bulk transport? Vesicles made from cell surface membrane in endocytosis and fusing with the cell membrane in exocytosis 20 of 30 What is step one in the investigating membrane experiment? Cut equal sized pieces of tissue 21 of 30 What do you do with these tissue samples? Rinse under running water to remove all betalin released by cutting 22 of 30 Where are the pieces of beetroot placed? In equal volumes of distilled water, 23 of 30 What do you have to keep the same when using different temps of water? Leave for equal time or the same volume of water 24 of 30 What do you measure? The abundance of the betalin solution 25 of 30 What are three ways gas exchange surfaces adapt to gas exhange? The larger the area, thinner the diffusion path, steeper the concentration gradient 26 of 30 How is the lung adapted to surface area? Many alveoli give huge surface area 27 of 30 How is the lung adapted to concentration gradient? well supplied, constantly circulating blood which carries oxygen away and CO2 to the surface, breathing keeps CO2 levels down and O2 levels high 28 of 30 How are the lungs adapted to thickness of gas exhange surface? they are very thin just one epithelial cell in thickness 29 of 30 What does this do? Reduce the distance for diffusion 30 of 30
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