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Download “brains” of the cell, the nucleus directs cell activities and contains
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Transcript
Why does diffusion occur? 1 Kinetic energy causes molecules to constantly move and collide with each other. 2 What is the movement from an area of high concentration to an area of low concentration? 3 Diffusion 4 Give the type of particle transport that requires input of energy from the cell. 5 Active Transport 6 What happens to cells placed in a hypertonic solution? 7 They shrink due to losing water by osmosis 8 Which parts will be near water because they are hydrophilic? 9 Part labeled A:Polar heads of the phospholipids 10 Which parts will repel water because they are hydrophobic? 11 Part E: Non Polar Tails of phospholipids 12 When the concentrations across a cell membrane are the same… Does Osmosis occur? 13 No. Because the cell is at equilibrium in a state of homeostasis 14 Are cholesterol and phospholipids hydrophobic or hydrophilic? 15 Hydrophobic. Both are repelled by water. 16 What is osmosis? 17 The diffusion of water 18 What happens to a cell that is placed in a hypotonic solution? 19 It swells up 20 What structure serves as the cell’s boundary from its environment and regulates which materials enter and leave the cell? 21 Cell Membrane 22 Large molecules such as hormones are released or expelled from a cell during? 23 Exocytosis 24 What happens if too much water diffuses into a cell? 25 It may burst 26 What is an example of passive transport? 27 Diffusion 28 What is passive transport? 29 Cell transport that requires no energy from the cell 30 What is the movement of molecules down a concentration gradient across the cell membrane? 31 Diffusion 32 What is the difference in the concentration of dissolved particles from one location to another is called? 33 Concentration Gradient 34