What's up Doc and Mr. Potatohead Rubric Write up requirements: (revised 10/2013)

  Rubric: (36 points)

Title (must contain IV and DV information) (1 point)

Data Table (contains both carrot or potato in “% change in mass”. Needs complete title, units, data centered in columns, and only one horizontal line under column titles.(4 points)

Graph: needs a complete title, axes labels including units in parenthesis, two trendlines with equations (for both carrot and potato). X-axis has been modified to show minor gridlines. (4 points) for both veggies

Laboratory Review Questions (Conclusion Questions): (remember avoid all pronouns and sentences should never start with the word “it”.)

  1. What did you observe during the demonstration using the artificial cell (dialysis tubing)? Draw the 2 beakers and show the flow of iodine, water, and glucose. Why did the dialysis tubing in beaker 1 with iodine turn purple? What evidence was there that glucose also moved from the dialysis tubing? Is dialysis tubing a good model for a living cell? Are there any problems with the model? (5 points)

  2. Using the x-y scatter graph you made for carrots and potatoes. By hand calculate the isotonic point (where the line crosses the x-axis) which is the internal solute concentration of the carrot or the potato. Use the y=mx+b equation, set “y” to zero and solve for x. Show all your work for both calculations. (5 points)

  3. Reflect on what you thought would happen to the carrots and potatoes overnight (original hypothesis). Does the data support or refute your personal  hypothesis? Explain using data (your calculations, internal concentration of the veggies as evidence). (5 points)

  4. Draw a diagram of how water moves when a veggie is in an isotonic solution, hypotonic solution and a hypertonic solution. (5 points)

  5. Compare the demo to the carrot and potato part of the lab, reflect on similarities and differences of both. Include the difference between diffusion and osmosis and relate the the 2nd law of thermodynamics in your comparison. (5 points)

References: 2 minimum make sure you use the proper format APA (use bibme.org) for credit. (example this lab and the sections in your book, you'll also need to include any references that you used to look up the answers to question #4 and #5). (2 points)