A Fishy Tale Case Study

  • You have an artificial cell containing 35% glucose placed in a 15% glucose solution. (Note: the cell is the circle; the rectangle is the solution.)
    • Which way will the water move (in or out of the cell)?
    • Will the cell shrink, swell, or stay the same size?
    • What type of solution is the cell in (hypotonic, isotonic, or hypertonic)?
  • You have an artificial cell containing 12% NaCl placed in a solution that is 15% glucose and 10% NaCl.
    • Which way will the water move (in or out of the cell)?
    • Will the cell shrink, swell, or stay the same size?
    • What type of solution is the cell in (hypotonic, isotonic, or hypertonic)?

Mini-Case – A Fishy Tale

You read a news release indicating that a species of saltwater fish was found in Lake Michigan. How it got there was a mystery. Unfortunately, the fish has died. In another instance, a saltwater fish was found living in a lake a bit upstream from the Gulf of Mexico. It was assumed that the fish swam from the ocean to a freshwater lake. This fish survived and is doing well in the lake. You wonder why one fish survived and the other did not. (Make sure to include specific biological terms like hypotonic, isotonic, or hypertonic in your explanation. Also talk about the water relationship between the cells of the fish and the water outside.)

Questions:

  • What happened to the saltwater fish that was found in Lake Michigan?
  • Explain what happened to the survivor fish that swam from the Gulf of Mexico to the freshwater lake. (Hint: the journey from the ocean to the lake will take the fish through some brackish water – water that has more salinity than freshwater but less than salt water.)
  • What would happen to a freshwater fish that suddenly found itself in the Atlantic Ocean? Explain.
  • Based on your understanding of water movement in and out of cells, give a definition for the term: osmoregulation. (Don’t Google it!) Which fish demonstrated more effective osmoregulation?

Questions: 1. You have an artificial cell containing 35% glucose placed in a 15% glucose solution. (Note: the cell is the circle; the rectangle is the solution.) a. Which way will the water move (in or out of the cell)? b. Will the cell shrink, swell, or stay the same size? c. What type of solution is the cell in (hypotonic, isotonic, or hypertonic)? 2. You have an artificial cell containing 12% NaCl placed in a solution that is 15% glucose and 10% NaCl. a. Which way will the water move (in or out of the cell)? b. Will the cell shrink, swell, or stay the same size? c. What type of solution is the cell in (hypotonic, isotonic, or hypertonic)? Mini-Case – A Fishy Tale You read a news release indicating that a species of saltwater fish was found in Lake Michigan. How it got there was a mystery. Unfortunately, the fish has died. In another instance, a saltwater fish was found living in a lake a bit upstream from the Gulf of Mexico. It was assumed that the fish swam from the ocean to a freshwater lake. This fish survived and is doing well in the lake. You wonder why one fish survived and the other did not. (Make sure to include specific biological terms like hypotonic, isotonic, or hypertonic in your explanation. Also talk about the water relationship between the cells of the fish and the water outside.) Questions: 1. What happened to the saltwater fish that was found in Lake Michigan? 2. Explain what happened to the survivor fish that swam from the Gulf of Mexico to the freshwater lake. (Hint: the journey from the ocean to the lake will take the fish through some brackish water – water that has more salinity than freshwater but less than salt water.) 3. What would happen to a freshwater fish that suddenly found itself in the Atlantic Ocean? Explain. 4. Based on your understanding of water movement in and out of cells, give a definition for the term: osmoregulation. (Don’t Google it!) Which fish demonstrated more effective osmoregulation?

  • Grid View
  Excellent Good Fair Poor
Main Postinga 45 (45%) – 50 (50%)

Answers all parts of the discussion question(s) expectations with reflective critical analysis and synthesis of knowledge gained from the course readings for the module and current credible sources.

Supported by at least three current, credible sources.

Written clearly and concisely with no grammatical or spelling errors and fully adheres to current APA manual writing rules and style.

40 (40%) – 44 (44%)

Responds to the discussion question(s) and is reflective with critical analysis and synthesis of knowledge gained from the course readings for the module.

At least 75% of post has exceptional depth and breadth.

Supported by at least three credible sources.

Written clearly and concisely with one or no grammatical or spelling errors and fully adheres to current APA manual writing rules and style.

35 (35%) – 39 (39%)

Responds to some of the discussion question(s).

One or two criteria are not addressed or are superficially addressed.

Is somewhat lacking reflection and critical analysis and synthesis.

Somewhat represents knowledge gained from the course readings for the module.

Post is cited with two credible sources.

Written somewhat concisely; may contain more than two spelling or grammatical errors.

Contains some APA formatting errors.

0 (0%) – 34 (34%)

Does not respond to the discussion question(s) adequately.

Lacks depth or superficially addresses criteria.

Lacks reflection and critical analysis and synthesis.

Does not represent knowledge gained from the course readings for the module.

Contains only one or no credible sources.

Not written clearly or concisely.

Contains more than two spelling or grammatical errors.

Does not adhere to current APA manual writing rules and style.

Main Post: Timeliness 10 (10%) – 10 (10%)

Posts main post by day 3.

0 (0%) – 0 (0%) 0 (0%) – 0 (0%) 0 (0%) – 0 (0%)

Does not post by day 3.

First Response 17 (17%) – 18 (18%)

Response exhibits synthesis, critical thinking, and application to practice settings.

Responds fully to questions posed by faculty.

Provides clear, concise opinions and ideas that are supported by at least two scholarly sources.

Demonstrates synthesis and understanding of learning objectives.

Communication is professional and respectful to colleagues.

Responses to faculty questions are fully answered, if posed.

Response is effectively written in standard, edited English.

15 (15%) – 16 (16%)

Response exhibits critical thinking and application to practice settings.

Communication is professional and respectful to colleagues.

Responses to faculty questions are answered, if posed.

Provides clear, concise opinions and ideas that are supported by two or more credible sources.

Response is effectively written in standard, edited English.

13 (13%) – 14 (14%)

Response is on topic and may have some depth.

Responses posted in the discussion may lack effective professional communication.

Responses to faculty questions are somewhat answered, if posed.

Response may lack clear, concise opinions and ideas, and a few or no credible sources are cited.

0 (0%) – 12 (12%)

Response may not be on topic and lacks depth.

Responses posted in the discussion lack effective professional communication.

Responses to faculty questions are missing.

No credible sources are cited.

Second Response 16 (16%) – 17 (17%)

Response exhibits synthesis, critical thinking, and application to practice settings.

Responds fully to questions posed by faculty.

Provides clear, concise opinions and ideas that are supported by at least two scholarly sources.

Demonstrates synthesis and understanding of learning objectives.

Communication is professional and respectful to colleagues.

Responses to faculty questions are fully answered, if posed.

Response is effectively written in standard, edited English.

14 (14%) – 15 (15%)

Response exhibits critical thinking and application to practice settings.

Communication is professional and respectful to colleagues.

Responses to faculty questions are answered, if posed.

Provides clear, concise opinions and ideas that are supported by two or more credible sources.

Response is effectively written in standard, edited English.

12 (12%) – 13 (13%)

Response is on topic and may have some depth.

Responses posted in the discussion may lack effective professional communication.

Responses to faculty questions are somewhat answered, if posed.

Response may lack clear, concise opinions and ideas, and a few or no credible sources are cited.

0 (0%) – 11 (11%)

Response may not be on topic and lacks depth.

Responses posted in the discussion lack effective professional communication.

Responses to faculty questions are missing.

No credible sources are cited.

Participation 5 (5%) – 5 (5%)

Meets requirements for participation by posting on three different days.

0 (0%) – 0 (0%) 0 (0%) – 0 (0%) 0 (0%) – 0 (0%)

Does not meet requirements for participation by posting on 3 different days.

Total Points: 100

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