Cell Membrane Model Demonstration Using Dialysis Tubing

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In this video, Mr. W demonstrates selective permeability using dialysis tubing, fructose-starch solution, and iodine solution. The video uses animation and explanation to demonstrate selective permeability and to connect it to the molecular characteristics of starch, fructose, and iodine.
This video can be used to help students master AP Biology Topic 2.5 (selective permeability) and it’s a part of the official AP Biology Diffusion and Osmosis Lab.
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[@mrstipizy2442]

me dude my bio teacher is a struggle

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Me lmao. What was y’all’s results? For science of course

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meee\

[@cheloochoagonzalez8120]

Same. My teacher isn't explaining things correctly

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Way to go, Elias! Try studying with the tutorials on my website, sciencemusicvideos.com

[@ritapeters1909]

Yo, this is the best video on this lab out there, I've watched so many. Mr. W coming in for the WINNN. Definitely a great video! I cant believe I'm paying $1375 for a zoology class (which is online) and the best they could do for the online lab on diffusion was photos of the results that look like they were taken on an android.

[@DulceAlondra93]

I'd like to mention I came across this video because the questions on my worksheet are based on this video. We cannot currently perform our own experiments due to Covid-19, so this is awesome! Thank you for a great experiment.

[@nicolasporter4113]

u Tryna slide the answers?

[@DulceAlondra93]

@@nicolasporter4113 Oh man, that worksheet is turned in and forgotten now :D

[@jeanefersaaban9872]

I haven't yet finish the video, but I already get what he's discussing. This video is awesome!

[@therealmccoy_rn]

Great visual explanation!

[@sciencemusicvideos]

Thank you!

[@tenzindolker6519]

Wow this was so helpful, no tutorial ever made it this easy to understand. I wish you taught at our college.

[@sciencemusicvideos]

I'm at a high school! Check out my membranes tutorials at sciencemusicvideos.com/apbio2019/

[@colettebizal6464]

Nice job. Thank you!

[@miared]

I finally understand!! Thank you Mr. W!

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This was very helpful! Thank you so much

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Used this to flesh out our homeschool bio kit experiment manual today. Thank you so much!

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[@madfruity5291]

Thank you so much Mr W

[@sciencemusicvideos]

You're welcome, Madi. If you want to learn about membranes, go to the the tutorial at sciencemusicvideos.com/ap-biology/membranes-quiz/

[@linhnguyen-dr2vi]

Awesome!!!Help me a lot in bio class. Thanks

[@itsallaboutlove3834]

Thanks for making me understand this .🙏

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Sure thing, Aune. Check out the tutorials I have about to help you learn biology at sciencemusicvideos.com/apbio2019/ Let me know what you think! Mr. W

[@lakshmivijayaraghavan9626]

It is very useful for me as a teacher to use your video during online time instead of a lab and use it in Ed puzzle to create a formative assessment. Thank you!

[@elenaray8521]

I love this!

[@fonchi1971]

NICE JOB PROF.

[@schmornk888]

Thanks

[@NikkiDeath90]

Thank You

[@inceraudhiahzahra1012]

sir, can I have information where did you get the semipermeable membrane in this video? thank you

[@kimdtruong4815]

awsome professor

[@sciencemusicvideos]

Thanks, Kim!

[@rocketrene9095]

Thanks man!

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You bet!

[@user-nv9ps9jg9e]

thank you

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You’re welcome! Check out my tutorial at learn-biology.com.

[@MidwestMaMa541]

Very good video! What substances did you use in the dialysis tubing for starch and fructose?

[@sciencemusicvideos]

Not sure what you mean. Besides starch and fructose?

[@sab9561]

@@sciencemusicvideos I think they meant the iodine

[@user-rq3lp6ld9t]

I would like to know the purchase information of the dialysis tube used in the video.

[@klausmikaelson2881]

What pore size dialysis bag did you use?

[@molasis4092]

What are the ingredients for this experiment?

[@mariamalhammadi5649]

why The dialysis bag turned dark blue/purple? and why The fructose test strip turned positive when dipped in the solution?

[@serikaninagracy]

How large are the pores in the membrane?

[@kananicodemus9923]

How does this late to the concepts of diffusion and osmosis?

[@cristllejoydolor9182]

Supposing we are going to use milk as the sample. Then if we test the dialysate for sugar and protein, which test will give a positive result?

[@burntbean5312]

how big is a water molecule compared to starch iodine and fructose

[@eloramichelle7948]

I was starting to hate my bio labs until I saw this video now I dont feel so helpless lol

[@eloramichelle7948]

Plus my lab prof is a donkey that's putting it nicely

[@eliasscott5207]

can glucose diffuse?

[@hairbymara._8747]

Can someone or anyone give me the answers for these questions that my biology teacher came up with Questions: 1) What substance diffused into the bag from the cup? How can it do that? 2) What substance diffuses from the bag into the solution in the cup? How can it do that? 3) What substance cannot diffuse through the dialysis bag? Why not? 4) Why does the solution in the cup get lighter? I would appreciate it if yall would give me the answers for this.

[@sciencemusicvideos]

Mara; all of your questions are answered in the video.

[@user-xe6ch9oe5x]

where did you get the dialysis bags?

[@sciencemusicvideos]

I’ve gotten them from Carolina biological supply, but you can also get them from flinn, etc. Are you teaching a AP Bio?

[@Ishaakumaar]

did water diffuse through the solution from the cup into the bag?

[@sciencemusicvideos]

Probably, but that’s not the point of this experiment. It’s really about tracking movement of the solute. Looking at the water change would be more about osmosis, and there are better labs to do that with

[@natividadmedina5582]

yes

[@sciencemusicvideos]

Yes!

[@bubanibubanii9913]

Is that process able to take over the color of dissolved coffee ????

[@lifetv3250]

I ripped my dialysis tubing what can I use in replace of the tubing?

[@ZahEiga]

Thanks a lot but I have a question That is why there is no Color change in frutos solution?

[@Alexis-nd9kw]

i think the fructose didnt diffuse out of the dialysis tubing

[@henngaming2158]

I just did this project in my class and iodine is a really hard stain to get off glad I didn't get that on me

[@petarevell6801]

does anyone know what the iv and dv are please and thankyou :)

[@jasonbroderick1197]

You do not mention water movement in and or out of the bag. Any reason why? If you weigh the bag before hand it should weigh more after.

[@sciencemusicvideos]

Only because this is a qualitative lab. I have another movie about osmosis in the works...but it won't be up until next year.

[@TheKyleFyles]

can anyone explain why the solution in the cup after 24 hours is labeled as lighter red? it's obviously clear.

[@jakerodgers2110]

You didn’t say anything about water being permiable to the bag or not for 6/10 on my test:(

[@oliviamoibi3019]

how does the visking tubing differ from the cell membrane?

[@sciencemusicvideos]

They're only similar in that they are both selectively permeable. Chemically, they're utterly different.

[@Mahatvagaur]

Can someone please make a summary about this video

[@samkk857jj4]

Would u talk about basic and molecular genetics, Mr W?😅

[@sciencemusicvideos]

Definitely...but probably not soon enough for what you need. I do have tutorials about all of this on my website, and we're offering free trials: go to www.sciencemusicvideos.com. Good luck! Mr. W

[@samkk857jj4]

@@sciencemusicvideos thanks Mr W.

[@j4sonx_10]

what was the purpose of the test tube?

[@sciencemusicvideos]

It's a control: something that's impermeable to everything. It also preserves the starting iodine solution so you can do a before and after comparison.

[@scienceforminds92]

Root hair cell membrane absorb ink water by osmosis

[@user-hv9vl7pu4y]

My teacher came up with this question: How do you know that the molecules in this experiment diffused across the dialysis tube membrane and did not leak out or into the dialysis tube? Can I get help please?

[@dinachin7313]

hey, I just thought if the contents were to leak then starch would appear in the iodine solution too however it didn't so maybe that would prove the leak and we would see fructose and starch apparent.

[@yamiseif7353]

you have officially saved my brain cells from committing suicide, thanks x')

[@sciencemusicvideos]

Good to know! Keep those brain cells safe!

[@user-iv9dj9oh3q]

If I want to demonstrate this experiment during the class, how I could increase rate of osmosis? I've just 90 minutes, we cant wait 24 hours.

[@sciencemusicvideos]

Sorry this comment is so late, but it actually occurs pretty quickly. You can probably get some visible results in 30 minutes.

[@jawaheraldhaheri3875]

Why the fructose test strip turned positive when dipped in the solution

[@DulceAlondra93]

Because the dialysis tube is selectively permeable to fructose. This means the original fructose that was in the bag is allowed to move outside the bag and into the water. An example of the opposite of this would be starch. The dialysis tube is NOT selectively permeable to starch. This means the starch that was in the bag is NOT allowed to move outside the bag into the water.

[@kagrimreaper]

Bc there was fructosein the solution lol

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[@ThePatrolCapCrow]

Thanks for the information teach, I am also now uncomfortable with this information, even though it will help me in class.

[@elise3921]

Someone summarize this

[@harrisonsternberg8499]

MY G

[@oshaalshehhi5117]

Why the fructose test strip turned positive when dipped in the solution?

[@TheOPCeleryStick]

What do we do if we don't know anything about starch??????? 1:59

[@sciencemusicvideos]

It's a polysaccharide. A big molecule. That's all you need to know.

[@TheOPCeleryStick]

@@sciencemusicvideos thanks :DDD

[@meeee1278]

1:44 looks like his shirt changed color

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Marcus Veltri's dad.

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i am so confused like wut?!

[@danieltomasi2796]

go to 4:55 if you are here for bio

[@Alexis-nd9kw]

ty

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Please arabe 😭😭😭😭no English . lam not anderstand your 🤝🏻💔😔. .

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Hi Mr. W, Check out my chemistry for biology tutorials at www.sciencemusicvideos.com/basic-chemistry-tutorials/ Let me know if you think they'd be useful to you. Pipi Guy