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Active transport

Active transport. Transport mechanisms. Passive transport (doesn’t require energy) Diffusion Facilitated diffusion Osmosis Filtration Active transport (uses energy from ATP) Bulk transport. }. Movement down a concentration gradient. 2. Active transport. Uses chemical energy from ATP

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Active transport

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  1. Active transport

  2. Transport mechanisms Passive transport (doesn’t require energy) • Diffusion • Facilitated diffusion • Osmosis • Filtration Active transport (uses energy from ATP) • Bulk transport } Movement down a concentration gradient

  3. 2. Active transport • Uses chemical energy from ATP • Move molecules against the concentration gradient (low conc.  high conc.)

  4. Bulk Transport

  5. Videos http://www.youtube.com/watch?v=_bmp2_T0c7k active transport (short) http://www.youtube.com/watch?v=K7yku3sa4Y8&NR=1 bulk transport (short)

  6. MENU Quick Quiz Key Words Videos MCQ Exercises

  7. Key words Back to menu • sovent • solute • solution • soluble • passive • diffusion • membrane • phospholipidbilayer • permeable • impermeable • selectively permeable • concentration gradient • surface area • facilitated transport • carrier proteins • ion channels • osmosis • water potential • active transport • ATP • bulk transport • endocytosis • phagocytosis • pinocytosis • hypertonic • hypotonic • isotonic

  8. Quick quiz Back to menu • Solutes ____ down a concentration gradient • Ions are ____ (they can dissolve) in water • Passive transport is always ____ a concentration gradient. • Passive transport does not require ____ • Diffusion is one type of ____ transport. • ____ diffusion requires protein carriers or ion channels • Facilitated diffusion does / does not require ATP • ____ is the diffusion of water across a selectively permeable membrane • Water diffuses down a water ____ gradient • ____ transport requires energy (ATP) because diffusion is ____ the concentration gradient Answers

  9. Quick quiz Back to menu • Solutes diffuse down a concentration gradient • Ions are soluble (they can dissolve) in water • Passive transport is always down a concentration gradient. • Passive transport does not require energy (or ATP) • Diffusion is one type of passive transport. • Facilitated diffusion requires protein carriers or ion channels • Facilitated diffusion does / does not require ATP • Osmosis is the diffusion of water across a selectively permeable membrane • Water diffuses down a water potential gradient • Active transport requires energy (ATP) because diffusion is against the concentration gradient

  10. Exercise Back to menu • Workbook pp 62-6 • Pathfinder pp • READING • Pathfinder p48 (or p42) Enzymes & reaction rate • Excellence in Biology pp114-6

  11. Videos Back to menu http://www.youtube.com/watch?v=_bmp2_T0c7k (Na/K pump) http://www.youtube.com/watch?v=ldRZcmppQM8&feature=related (transport, 8 min) http://www.youtube.com/watch?v=K7yku3sa4Y8&feature=related (endo- exo-cytosis, 1 min) http://www.youtube.com/watch?v=sdiJtDRJQEc&feature=related (osmosis, 1 min) http://www.youtube.com/watch?v=VUnvwrx8Wq4&feature=related (5 min)

  12. Question 1 Back to menu 27 Diffusion can normally not take place in (a) a liquid (b) a solution √ (c) a solid (d) a gas

  13. Question 2 Back to menu 29 Diffusion takes place as a result of (a) convection currents (b) air movements √ (c) natural movement of molecules (d) changes in temperature

  14. Question 3 Back to menu 31 In a plant leaf, CO2 diffuses into the air space between cells, b) into the cytoplasm, c) through the cell wall, d) through a pore in the epidermis. The correct sequence is (a) a,b,c,d (b) c, b, d, a √ (c) d, a, c, b (d) d, c, a, b

  15. Question 4 Back to menu 32 Which of these would you NOT expect to diffuse freely through a cell membrane ? (a) carbon dioxide (b) water √ (c) proteins (d) oxygen

  16. Question 5 Back to menu 33 Through which of these layers would you expect diffusion to be most rapid ? (a) (b) (c) √ (d)

  17. Question 6 Back to menu 26 In osmosis, water will diffuse through a membrane (a) From water to a concentrated solution (b) From a concentrated solution to a dilute solution (c) From a dilute solution to a concentrated solution √ (d) From a dilute solution to a more dilute solution

  18. Question 7 Back to menu 27 Which statement is false ? (a) The plant cell wall is permeable to water √ (b) The plant cell wall is selectively permeable (c) The cell membrane is selectively permeable (d) The vacuole contains a solution of salts and sugars

  19. Question 8 Back to menu 28 Cell sap concentrated solution a c dilute solution more dilute solution b Plant cells Water will tend to move by osmosis (a) from b to a and c, and from c to a √ (b) from c to a and b, and from a to b (c) From a to b and c, and from c to b (d) From c to b and a, and from b to c

  20. Question 9 Back to menu 29 Which statements are correct ? √ (a) A fresh water fish tends to absorb water by osmosis (b) A sea water fish tends to absorb water by osmosis (c) A fresh water fish tends to lose water to its surroundings √ (d) A sea water fish tends to lose water to its surroundings

  21. Question 10 Phagocytosis requires energy because (a) it is a form of active transport (b) it is a type of bulk transport (c) it involves the membrane (d) food is absorbed against the concentration gradient

  22. Correct Back to menu 31

  23. Incorrect Back to menu 32

  24. The end

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