Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Unit 4 Review Sheet Name ___________________________________ 1. Diffusion is the movement of molecules from the area of __________________concentration to the area of __________________concentration. 2. Osmosis is the movement of __________________across a selectively permeable membrane. 3. A cell is isotonic to a solution of 0.01% sugar. A. What concentration would by hypertonic? __________________________ B. What concentration would be hypotonic? ___________________________ 4. a) What happens to an animal cell in a hypotonic solution? ____________________________________ b) What happens to an animal cell in a hypertonic solution? ____________________________________ 5. List 3 ways in which active transport differs from the process of diffusion across a cell membrane. I. II. III. 6. List 2 ways in which facilitated transport differs from active transport. I. II. 7. Within each of the three pairs, choose the more concentrated solution: 1st Pair: a. 80% water, 20% starch b. 90% water, 10% starch Most Concentrated _______________ 2nd Pair: a. 5 g salt, 50 g water b. 5 g salt, 25 g water Most Concentrated _______________ 3rd Pair: a. 85% solvent, 15% solute b. 75% solvent, 25% solute Most Concentrated _______________ True or False: 8. 9. 10. 11. If a plant cell is placed in salt solution, the central vacuole will shrink If a red blood cell is placed in distilled water (no solutes), it will shrink If a plant cell is placed in distilled water (no solutes), the cell membrane will lose internal pressure If a red blood cell is placed in a salt solution, salt will enter the cells, giving them a strange appearance 12. A small lipid molecule passes easily through the cell membrane. Which of these statements is the most likely explanation? A. B. C. D. A protein carrier must be at work The cell membrane is partly composed of lipid molecules and simple diffusion is occurring The cell is expending (using) energy to do this Phagocytosis has enclosed this molecule in a vacuole 13. Which of these does not require an expenditure (usage) of energy? Diffusion Osmosis Phagocytosis Facilitated Diffusion Endocytosis Exocytosis 14. The thyroid gland contains a high concentration of iodine. Adding iodine to an area that already has a high concentration would be an example of: A. B. C. D. passive transport active transport facilitated diffusion exocytosis 15. Cell drinking is synonymous with a) cell eating b) endocytosis c) phagocytosis d) pinocytosis 16. Which of the following substances would be taken into a cell by phagocytosis? A. B. C. D. water proteins simple sugars small lipids 17. An animal cell will always take in water when placed in a (n): A. B. C. D. hypertonic solution hypotonic solution isotonic solution active solution Consider the diagram to the right. Note: This is not a cell. 18. Will the concentration of water stay the same, increase, or decrease over time? _____________________ Side A Side B 20% Protein 4% Glucose 75% w ater 2% Glucose E. 98% Water membrane 19. Will the concentration of protein on side A stay the same, increase, or decrease over time? __________ 20. Glucose will cross the membrane in which direction? __________________ 21. What type of transport is being represented by the diagram below? _________________________________ 22. On the same diagram as 21, label the phosphate groups (polar heads) and the fatty acid tails. 22. What molecule helps stabilize the plasma membrane’s fatty acids and keeps it flexible? _______________________________________ 23. What is a tell-tale sign that the kidneys are failing? ________________________________________________