Discussion: Diffusion And Osmosis

Want create site? With you can do it easy.

Discussion: Diffusion And Osmosis

Discussion: Diffusion And Osmosis

Permalink:

Struggling to find relevant content or pressed for time? – Don’t worry, we have a team of professionals to help you on
Discussion: Diffusion And Osmosis
Get a 15% Discount on this Paper
Order Now

We will be using dialysis tubing to simulate a semipermeable membrane. This tubing allows small molecules (e.g., water, ions, glucose) to pass while preventing large molecules (e.g., macromolecules like proteins, starch, glycogen) from moving across.  Be sure you have read over the suggested material before starting this exercise and that you have reviewed the following animations:

Experimental Design

 

A.      The dialysis bag we will use is permeable to water and small molecules (e.g., less than 500 g/mol) and impermeable to large molecules (e.g., more than 500 g/mol).

B.      The dialysis bag is filled with a mixture of glucose (molecular weight = 180 g/mol) and protein (molecular weight = 10,000 g/mol) dissolved in water. A small subsample of the dialysis bag contents is saved and will be used in Step 4.

C.      The dialysis bag is then placed into a beaker of water. A small subsample of beaker water is also saved and is to be used in Step 4 as well.

The presence or absence of glucose and protein will be determined using indicators. Indicators change colors in the presence certain materials. The two tests that we’ll use are the Benedict’s test for simple sugars (e.g., glucose) and theBiuret test for the presence of proteins.

·         If glucose is present, the Benedict’s indicator will turn green. If no glucose is present, the solution will be blue.

·         If protein is present, the Biuret indicator will turn violet.  If the solution remains clear, then no protein is present.

4.    The subsample of dialysis bag solution and the beaker water are tested for the presence of glucose and protein. SeeTable 1 below for the results.

5.    The dialysis bag is then left in the beaker of water for 60 minutes.

6.    At the end of 60 minutes, the dialysis bag solution and the beaker water are again tested for the presence of glucose and protein. See Table 1 below for the results.

 

Table 1. Results of testing of the dialysis bag and beaker contents at the beginning and end of the Experiment.

 

Questions

1.    Summarize the results regarding the presence (+) or absence (-) of glucose and protein in the dialysis bag and beaker in Table 2 below (4 pts):

 

 

2.    Explain the movement or lack of movement of protein and glucose across the dialysis bag membrane (4 pts)

3.    Which solution, that in the bag or that in the beaker, is hypotonic compared with the protein solution (2 pts)?

4.    What factors affect the movement of molecules across a semipermeable membrane? Which factor plays the greatest role in biological systems (4 pts)?

 

5.    Briefly explain what active transport is and how it differs from passive transport, especially in terms of concentration gradients (4 pts).

 

 

 

Experiment 3 Exercise 2: Osmosis – The Movement of Water across a Membrane

 

Before starting, let’s see what you know about the terms hypotonic, isotonic and hypertonic. Examine the diagrams below. Note that the small green circles represent dissolved solutes like salt, glucose, and amino acids. You can assume that the additional space surrounding the solutes is water and that the tan area is INSIDE the cell.

 

Question

 

1.      Define each term below in terms of solute concentration outside compared to the inside of the cell. You do not need to explain which direction water will move (3 pts).

a.      Hypotonic –

b.      Isotonic –
c.       Hypertonic –

 

Procedure

1.    Open the following website to get started:

The Biology Place. No Date. Osmosis: Movement of Water across Membranes

B.      Read over the information presented and then Click on 

C.      Then, Click on .  Read through the information presented and be sure to click on Animate beneath the illustration.

2.      What concentration of salt is isotonic to animal cells (1 pts)?

 

3.      When cells are in isotonic solution, is there movement of water into or out of the cell?  If so, describe this movement (3 pts).

 

  1. Click on  .E.      Read through the information presented and be sure to click on Animate beneath the illustration. When ready, answer the following question.

 

 

4.      Describe the net movement of water molecules when cells are placed in a hypotonic solution.  Explain why water moves this way (3 pts).

Procedure (continued)

G.     Read through the information presented and be sure to click on Animate beneath each of the illustrations. Answer the following questions. Your answers should incorporate the terminology used in the animations.

5.      What happens to an animal cell when placed in a hypotonic solution (2 pts)?

 

 

6.      What happens to plant cells when placed in a hypotonic solution? What accounts for the difference in outcomes between animal cells and plant cells (3 pts)?

 

 

Procedure (continued)

8.    Click on  

I.     Then,  Read through the information presented and be sure to click on Animate beneath the illustration. Answer the following question.

 

7.      Describe the net movement of water molecules when cells are placed in a hypertonic solution.  Explain why water moves this way (3 pts).

 

Procedure (continued)

10.  Click on

K.      Read through the information presented and be sure to click on Animate beneath the illustration. Answer the following questions.

8.    Compare and contrast what happens to plant and animal cells when placed in a hypertonic solution. Be sure to use proper terminology (4 pts).

9.    Based on what you learned in this exercise, explain why salt might make a good weed killer (3 pts).

 

Week 3 Experiment Grading Rubric

Did you find apk for android? You can find new and apps.

Calculate the price
Make an order in advance and get the best price
Pages (550 words)
$0.00
*Price with a welcome 15% discount applied.
Pro tip: If you want to save more money and pay the lowest price, you need to set a more extended deadline.
We know how difficult it is to be a student these days. That's why our prices are one of the most affordable on the market, and there are no hidden fees.

Instead, we offer bonuses, discounts, and free services to make your experience outstanding.
How it works
Receive a 100% original paper that will pass Turnitin from a top essay writing service
step 1
Upload your instructions
Fill out the order form and provide paper details. You can even attach screenshots or add additional instructions later. If something is not clear or missing, the writer will contact you for clarification.
Pro service tips
How to get the most out of your experience with MyCoursebay
One writer throughout the entire course
If you like the writer, you can hire them again. Just copy & paste their ID on the order form ("Preferred Writer's ID" field). This way, your vocabulary will be uniform, and the writer will be aware of your needs.
The same paper from different writers
You can order essay or any other work from two different writers to choose the best one or give another version to a friend. This can be done through the add-on "Same paper from another writer."
Copy of sources used by the writer
Our college essay writers work with ScienceDirect and other databases. They can send you articles or materials used in PDF or through screenshots. Just tick the "Copy of sources" field on the order form.
Testimonials
See why 20k+ students have chosen us as their sole writing assistance provider
Check out the latest reviews and opinions submitted by real customers worldwide and make an informed decision.
Nursing
Great paper!
Customer 452707, July 1st, 2022
ENVIRONMENT SCIENCE
EXCELLENT
Customer 452813, June 19th, 2022
Accounting
Thanks for your support
Customer 452701, February 3rd, 2022
Social Work and Human Services
Good Work!
Customer 452587, September 2nd, 2021
Social Work and Human Services
Excellent! Done earlier than needed and with more sources than needed! Great work!
Customer 452485, August 22nd, 2021
Nursing
Great work! I can tell they put great effort in completing this assignment. Thank you.
Customer 452707, October 14th, 2022
Social Work and Human Services
Great Work !!!
Customer 452587, November 9th, 2021
Other
great
Customer 452813, July 5th, 2022
Nursing
Great writing! Really appreciate your help!
Customer 452503, April 22nd, 2021
Nursing
Fantastic work on this project as usual.
Customer 452707, July 5th, 2022
Human Resources Management (HRM)
Great Work!
Customer 452767, November 18th, 2022
Social Work and Human Services
Thank you for the great job
Customer 452469, February 3rd, 2021
11,595
Customer reviews in total
96%
Current satisfaction rate
3 pages
Average paper length
37%
Customers referred by a friend
OUR GIFT TO YOU
15% OFF your first order
Use a coupon FIRST15 and enjoy expert help with any task at the most affordable price.
Claim my 15% OFF Order in Chat

Get your perfect essay with a 15% discount. Use DC15

NEW

Thank you for choosing MyCoursebay. Your presence is a motivation to us. All papers are written from scratch. Plagiarism is not tolerated. Order now for a 15% discount

Order Now