Diffusion and Osmosis Overview

Diffusion and Osmosis Worksheet 1. The student sitting next to you just came from gym class and forgot to shower and you can tell. Diffusion 2. After sitting in the bathtub for hours, your fingers Osmosis start to look like prunes. 3. The girl sitting two rows ahead of you put on too Diffusion much perfume this morning 4. One way to get rid of slugs in your garden is to Diffusion sprinkle salt on them, so they shrivel up. 5. Yum! Something smells good. The neighbors are Diffusion cooking on the grill! 6. Gargling with salt water when you have a sore throat causes your swollen throat cells to shrink and feel better. Osmosis 7. Oxygen molecules move from the air sacs in the Diffusion lungs across the cell membranes into the blood. 8. Robert sprays water on the veggies in the produce section to "plump them up". Osmosis 9. You put raisins in a glass of water and they plump Osmosis up. 10. Use arrows to indicate the direction of diffusion in each case: is a molecule that can pass through the cell membrane. is a cell membrane. A) Molecules (sugars) inside the cell membrane are going out. B) Molecules (sugars) are going into the cell membrane. 11. For each of the situations below use an arrow to 1) 1% sugar 5% sugar indicate the net movement of sugar into or 2) 3% sugar 1% sugar out of the cell. (Assume that the sugar molecules 3) 1% sugar 1% sugar 1/3 can pass through the cell membrane in each case.) 12. The cell membrane is made of a p_________________ b_________________. phosphlipid bilayer 13. The cell membrane is _________________per- semipermeable, only meable. This means that ____________ certain things can pass _______________________________________________________________. through the membrane 14. Diffusion always causes particles to move from high, low a region of _______________ concentration to a region of ______________ concentration. 15. Does a cell use energy when molecules diffuse No in or out of the cell down the concentration gradient? 16. _____________________ requires energy (ATP) Active transport to transport molecules against a concentration gradient. 17. In _____________________ and _________________ no energy is used. Which one needs a helper to get things across? Osmosis, diffusion, facilitated diffusion 18. Concentration B: Amount of a substance in a certain place 19. Diffusion A: Moves particles like oxygen into cells 20. Equal amount of water inside a cell as outside G 21. More water outside a cell than inside E 22. Osmosis C: Moves water into and out of cells 2/3 23. More water inside a cell than outside F 24. Selectively permeable membrane D: Allows some substances through 25. You have just bought a tropical fish for your freshwater aquarium. Unfortunately, you do not realize it is a saltwater fish. Using your knowledge of osmosis, explain why this fish will not survive in your aquarium. The fish has a higher concentration of salt than the aquarium, so water will move into the fish and the fish will swell. 26. 5% salt, 10% salt (intracellular fluid, extracellular inside, outside (solute, fluid) water) 27. 10% salt, 10% salt (intracellular fluid, extracellu- both, both (solute, walar fluid) ter) 28. 3% glucose, 1% glucose (intracellular fluid, ex- outside, inside (solute, tracellular fluid) water) 29. 2% protein, 1% protein (intracellular fluid, extra- outside, inside (solute, cellular fluid) water) 30. 9% salt, 9% salt (intracellular fluid, extracellular both, both (solute, wafluid) ter) 31. 13% water, 25% water (intracellular fluid, extracellular fluid) outside, inside (solute, water) 32. 59% water, 45% water (intracellular fluid, extracellular fluid) inside, outside (solute, water) 33. 90% water, 92% water (intracellular fluid, extracellular fluid) outside, inside (solute, water) 34. 74% glucose, 87% glucose (intracellular fluid, ex- inside, outside (solute, tracellular fluid) water) 3/3