4. Explain why phospholipids will spontaneously form a membrane when placed in an aquatic solution.

Transcription

1 Homeostasis Stations Use the information provided around the room to complete this packet. STATION 1: Cell membrane LT: I can explain how the major organelles interact as a system to maintain cellular homeostasis. Directions: Use the cell membrane model you built, the information provided, and the textbook to answer the questions below. 1. In your own words, describe the cell membrane. 2. Why is the cell membrane called semi permeable? 3. The main component in the cell membrane is a phospholipid. Label the diagram: 4. Explain why phospholipids will spontaneously form a membrane when placed in an aquatic solution. 5. Identify the image that best illustrates the movement of molecules within the cell membrane 6. List four functions of the cell membrane

2 7. What macromolecules comprise the cell membrane and help in performing its duties? STATION 2: Cell Organelles Directions: Match the organelle with its picture, description, and the appropriate cell it is found in. Use any non-electronic resources at your disposal. Flag the teacher down to check your work. STATION 3: Passive Transport Directions: Answer the questions below using the textbook and information provided. 1. List the three types of passive transport and give an example of each. 2. Describe the fluid mosaic model of the plasma membrane. Discuss the role of the membrane in the movement of materials through it by Passive Transport 3. Use the picture on the left to answer the questions on the right. After digestion: = glucose molecule blood cell a. Which side has the higher concentration of glucose? b. Which way will the glucose go? c. Does this require energy? d. Is this active or passive transport? 4. Identify each image as: diffusion, osmosis, or facilitated diffusion.

3 Match the definition on the left with the term on the right. 5. Diffusion of water molecules through a selectively permeable membrane 6. Continuous movement of particles but no overall change in concentration 7. Movement of particles from an area of higher concentration to one of lower concentration a. diffusion b. dynamic equilibrium c. exocytosis d. osmosis STATION 4: Active Transport Directions: Answer the questions below using the textbook and information provided. 1. What is needed for Active Transport to take place? 2. List the 3 types of active transport and give an example of each. 3. Describe the fluid mosaic model of the plasma membrane. Discuss the role of the membrane in the movement of materials through it by Active Transport 4. Use the picture below to answer the question. This is an amoeba engulfing a particle of food. a. Does this require energy? b. Is this active or passive transport? c. Is this endocytosis or exocytosis? 5. Use the picture below to answer the question. This is an amoeba expeling waste. a. Does this require energy? b. Is this active or passive transport? c. Is this endocytosis or exocytosis?

4 6. A pathogenic bacterium has been engulfed by a phagocytic cell as part of the nonspecific (innate) immune response. Which type of cell transport does this illustrate? Does this illustrate passive or active transport? 7. A student designed an experiment to see if plants grow better when watered with a sugar solution. He divided the plants into six groups, measured the initial height of each plant, and calculated the average height for each group. Once a week for two months, he watered the plants in each group using a different sugar solution for each plant group. At the end of two months, he measured the final height of each plant and calculated the average height for each group. The student s data are shown in the table below. Which of these statements explains why the plants in Groups E and F died? a. The high sugar content caused too much water to move out of the root cells. b. The high sugar content caused too much water to move into the root cells. c. The high sugar content prevented the plant from capturing energy. d. The high sugar content clogged the pores in the cell membranes STATION 5: Tonicity Directions: Answer the questions below using the textbook and information provided. 1. Define these 3 terms: Isotonic- Hypertonic- Hypotonic- 2. Compare and contrast hypotonicity and hypertonicity

5 3. How does tonicity relate to homeostasis? 4. Label the tonicity for each solution (isotonic, hypotonic, or hypertonic): Directions: The rest of the question are homeostasis scenarios involving tonicity. Answer the questions to the best of your ability using what you ve learned about homeostasis and the information provided. 5. The diagram to the right shows an animal cell in a beaker containing a solution of sugar and water. The cell membrane is permeable only to water. Which statement describes the relationship between the animal cell and the contents of the beaker? a. There is a higher concentration of water inside the cell than outside the cell. b. There is a higher concentration of sugar inside the cell than outside the cell. c. There is an equal concentration of water inside the cell as outside the cell. d. There is an equal concentration of sugar inside the cell as outside the cell. 6. Many bacteria live in fresh water. Which of these statements best describes what will happen when freshwater bacterial cells are placed in salt water? a. Water leaves the cell, causing the cell to expand. b. Water leaves the cell, causing the cell to shrink. c. Water enters the cell, causing the cell to expand. d. Water enters the cell, causing the cell to shrink. 7. In an experiment, a group of students placed ten raisins in a container with 100 milliliters of water. They covered the container and let the raisins sit overnight. The students removed the raisins from the container and observed that they were larger. They also observed that the volume of water in the container had decreased.

6 What happened to the raisins to cause them to become larger? In your response, be sure to name the process that caused the raisins to become larger describe how this process caused the raisins to become larger explain the role of this process in living systems draw a diagram to illustrate what occurred during this experiment STATION 6: Homeostasis Directions- Think about the concepts of homeostasis (organelles, cell membrane, active and passive transport ) we are learning in class. Pick 1 of the following s to complete and attach the completed product to this stations packet Role Audience Format Topic Cell membrane Channel Protein Glucose White Blood Cell Job-seeking proteins The cell membrane Comic book Fans The immune System Help Wanted Advertisement Graffiti (fill a page with info about Protein Channels. Should be creative and highly visual) Comic Book Resume Controlling Sodium and Potassium flow (Sticking it to the MAN!) Make their presence known and show they are important in homeostasis as well Movement of sugar from your plate to your cells Seeking a job with the body Water The body Poem/Song/Rap The need for a cell to maintain homeostasis

7 STATION 7: Graphic Organizer for Cellular Transport Directions: Fill out the chart below with information about each method of cell transport using the textbook and what you ve learned from previous stations. Transport Mechanism Passive or Active Transport Cell membrane component that molecules use to pass through. Example: phospolipids, protein, vesicles etc. Direction molecules move through cells (From High to Low concentrations or from Low to High Concentrations) Brief description of mechanism Example of materials that enter/exit cells using this mechanism Diffusion Osmosis Facilitated Diffusion Ion Pump Endocytosis Exocytosis