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A solution is composed of a solute dissolved in a solvent. In the sugar water described in Figure 5-1, the solute was sugar and the solvent was water, and the solute molecules diffused through the solvent. It is also possible for solvent molecules to diffuse. In the case of cells, the solutes are organic and inorganic compounds, and the solvent is water. The process by which water molecules diffuse across a cell membrane from an area of higher concentration to an area of lower concentration is called osmosis (ahs-MOH-sis). Because water is moving from a higher to lower concentration, osmosis does not require cells to expend energy. Therefore, osmosis is the passive transport of water. Direction of Osmosis The net direction of osmosis depends on the relative concentra- tion of solutes on the two sides of the membrane. Examine Table 5-1. When the concentration of solute molecules outside the cell is lower than the concentration in the cytosol, the solution outside is hypotonic to the cytosol. In this situation, water diffuses into the cell until equilibrium is established. When the concentration of solute molecules outside the cell is higher than the concentration in the cytosol, the solution outside is hypertonic to the cytosol. In this situation, water diffuses out of the cell until equilibrium is established. Observing Diffusion Materials 600 mL beaker, 25 cm dialysis tubing, funnel, 15 mL starch solution (10 percent), 20 drops Lugol’s solution, 300 mL water, 100 mL graduated cylinder, 20 cm piece of string (2) Procedure 1. Put on your disposable gloves, lab apron, and safety goggles. 2. Pour 300 mL of water in the 600 mL beaker. 3. Add 20 drops of Lugol’s solution to the water. CAUTION: Lugol’s solution is a poison and eye and skin irritant. 4. Open the dialysis tubing, and tie one end tightly with a piece of string. 5. Using the funnel, pour 15 mL of 10 percent starch solution into the dialysis tubing. 6. Tie the other end of the dialysis tubing tightly with the second piece of string, forming a sealed bag around the starch solution. 7. Place the bag into the solution in the beaker, and observe the setup for a color change. Analysis What happened to the color in the bag? What happened to the color of the water around the bag? Explain your observations. Quick Lab www.scilinks.org Topic: Osmosis Keyword: HM61090 mb06se_homs01.qxd 11/27/07 8:52 AM Page 98 HOMEOSTASIS AND CELL TRANSPORT 99 When the concentrations of solutes outside and inside the cell are equal, the outside solution is said to be isotonic to the cytosol. Under these conditions, water diffuses into and out of the cell at equal rates, so there is no net movement of water. Notice that the prefixes hypo-, hyper-, and iso- refer to the relative solute concentrations of two solutions. Thus, if the solution outside the cell is hypotonic to the cytosol, then the cytosol must be hyper- tonic to that solution. Conversely, if the solution outside is hypertonic to the cytosol, then the cytosol must be hypotonic to the solution. Water tends to diffuse from hypo- tonic solutions to hypertonic solutions. How Cells Deal with Osmosis Cells that are exposed to an isotonic external environment usually have no difficulty keeping the movement of water across the cell membrane in balance. This is the case with the cells of ver- tebrate animals on land and of most other organ- isms living in the sea. In contrast, many cells function in a hypotonic environment. Such is the case for unicellular freshwater organisms. Water constantly diffuses into these organisms. Because they require a relatively lower concentration of water in the cytosol to function normally, unicel- lular organisms must rid themselves of the excess water that enters by osmosis. Some of them, such as the paramecia shown in Figure 5-2, do this with contractile vacuoles (kon-TRAK-til VAK-y ̄ ̄o ̄ ̄o-OL), which are organelles that remove water. Contractile vacuoles collect the excess water and then contract, pumping the water out of the cell. Unlike diffusion and osmosis, this pumping action is not a form of passive trans- port because it requires the cell to expend energy. Copyright © by Holt, Rinehart and Winston. All rights reserved. (a) (b) Vacuole filling with water Vacuole contracting TABLE 5-1 Direction of Osmosis Condition External solution is hypotonic to cytosol External solution is hypertonic to cytosol External solution is isotonic to cytosol Net movement of water into the cell out of the cell none H2O H2O H2O H2O H2O H2O The paramecia shown below live in fresh water, which is hypotonic to their cytosol. (a) Contractile vacuoles collect excess water that moves by osmosis into the cytosol. (b) The vacuoles then contract, returning the water to the outside of the cell. (LM 315) FIGURE 5-2 100 CHAPTER 5 (a) HYPOTONIC Cell walls (b) HYPERTONIC (a) ISOTONIC (b) HYPOTONIC (c) HYPERTONIC Other cells, including many of those in multicellular organisms, respond to hypotonic environments by pumping solutes out of the cytosol. This lowers the solute concentration in the cytosol, bring- ing it closer to the solute concentration in the environment. As a result, water molecules are less likely to diffuse into the cell. Most plant cells, like animal cells, live in a hypotonic environ- ment. In fact, the cells that make up plant roots may be surrounded by water. This water moves into plant cells by osmosis. These cells swell as they fill with water until the cell membrane is pressed against the inside of the cell wall, as Figure 5-3a shows. The cell wall is strong enough to resist the pressure exerted by the water inside the expanding cell. The pressure that water molecules exert against the cell wall is called turgor pressure (TER-GOR PRESH-er). In a hypertonic environment, water leaves the cells through osmosis. As shown in Figure 5-3b, the cells shrink away from the cell walls, and turgor pressure is lost. This condition is called plasmolysis (plaz-MAHL-uh-sis), and is the reason that plants wilt if they don’t receive enough water. Some cells cannot compensate for changes in the solute con-

Etymology explains the origin of the word itself. Example: Using the example term “arbitration”: Arbitration comes from the Latin judicium which means “judgment”. 2. History discusses the history of the term, its use, and controversies associated with it. Example: The use of arbitration as third-party mediation dates from the 1630s. 3. Cause and Effect discusses how the situation came about and what effects it may have. Example: An arbitration clause is considered to be ambiguous when the parties do not express clearly, that in case of conflict, the method to use to settle the disagreements will be arbitration. Hence, parties are compelled to refrain from signing confusing agreements to arbitrate, because the general rule is that arbitration is prompted out of the contract, and if there is not an explicit arbitration clause within the contract it would not be an agreement to arbitrate. 4. Description lists and defines the term. Example: Arbitration is the process of solving an argument between people by helping them to agree to an acceptable solution. It is the formal process of having an outside person, chosen by both sides to a disagreement to end the disagreement. 5. Principles of Operation discusses how something functions, including any special materials or conditions required. Example: Arbitration is conducted by a trained arbiter who sets down the rules that the parties must abide by. The object of arbitration is to obtain a fair resolution of disputes by an impartial third party without unnecessary expense or delay. Parties should be free to agree on how their disputes are resolved, subject only to such safeguards as are necessary for the public interest. Courts should not interfere. 5 6. Classification shows how the topic fits into a larger category. Example: Arbitration is one of the alternatives to going into a formal court to settle disputes. 7. Contrast shows how the topic differs from others in the same class. Example: In an arbitration proceeding, no lawyers are present. The main difference between arbitration and litigation law is that the court is involved in the case of litigation, as it is a lawsuit, whereas, in arbitration, a settlement between the parties is done outside of court. 8. Comparison shows how the topic is similar to others in the class. Example: As with lawsuits or other court proceedings, the decision in an arbitration proceeding is legally binding on the parties. 9. Analogy explains and compares two dissimilar topics, where the second is familiar to the audience. Example: An arbiter is like a referee–he or she listens to both sides and decides as to who is at fault, without the intervention of outside parties. 10.Examples represent other things because they have all the main qualities or characteristics that the thing they represent also have. Examples: Arbitration was used to settle the dispute between the labor union and management. Two people who are divorcing cannot agree on terms and allow a third party to come in to help them negotiate

Use this to make a quiz: Excellent! Using an online game is a fantastic way to boost engagement. Here is a list of scenarios you can use. I've designed them to be clear and concise for a game format. I've also added a few "challenge" scenarios at the end that could fit more than one theory to really get your students thinking critically. You can copy and paste these right into platforms like Kahoot!, Blooket, or Gimkit. --- ### **Scenarios for Your Online Game** **Instructions for Students:** Read the scenario and choose the theory that BEST explains why the crime was committed. 1. **Scenario:** An accountant has been secretly stealing small amounts of money from his clients' accounts for years. He has a system that he believes is foolproof, and he has calculated that the potential reward is worth the small risk of being caught. * **Best Fit:** Choice Theory 2. **Scenario:** A high school student who lives in a neighborhood with high unemployment and rundown buildings begins to vandalize property with a group of friends who feel ignored by the city. * **Best Fit:** Social Disorganization Theory 3. **Scenario:** A young woman desperately wants the new smartphone and designer clothes she sees all over social media, but she has no way to afford them. She decides to start stealing packages from front porches to get what she wants. * **Best Fit:** Strain Theory 4. **Scenario:** A man is arrested for assault after getting into a fight at a restaurant. His family tells the police that he has always had a "short fuse" and has struggled with anger and aggression since he was a child, a trait that his father also had. * **Best Fit:** Biological/Psychological Theory 5. **Scenario:** The youngest child in a family of well-known burglars is caught breaking into a house. When questioned, he says he learned everything he knows from watching and helping his older siblings. * **Best Fit:** Learning Theory 6. **Scenario:** A corporate executive is caught illegally dumping toxic waste to save his company money. He decided that the cost of proper disposal was too high and the chance of being caught was low. * **Best Fit:** Choice Theory 7. **Scenario:** After her parents' messy divorce, a teenager starts skipping school and shoplifting. A counselor suggests her actions stem from untreated anxiety and depression. * **Best Fit:** Biological/Psychological Theory 8. **Scenario:** In a community where the local factory closed down and police presence is low, a group of residents forms a vigilante group to "patrol" the streets, often resorting to violence and intimidation. * **Best Fit:** Social Disorganization Theory --- ### **Challenge Scenarios (Could fit multiple theories)** 9. **Scenario:** A college student starts selling forged concert tickets to pay for their tuition. They learned how to make the fake tickets from a video online and felt it was the only way to stay in school. * **Possible Answers:** Strain Theory (can't afford tuition), Learning Theory (learned online), Choice Theory (weighed the risks). 10. **Scenario:** A person living on the streets with no job prospects is arrested for stealing a warm coat from a department store during a blizzard. * **Possible Answers:** Strain Theory (no means to achieve the goal of being warm), Choice Theory (made a rational decision to steal to survive). These scenarios should give you great content for your game. Have fun with it, and let me know if you need any more!

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End of Topic Assessment: Unit 5

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End of Topic Assessment: Unit 4

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