Chapter 4.1 - Cell Membrane Structure and Function | Cambridge A-Level 9700 Biology

[@rickiesgucci4814]

I recently went from F to A+ for my Unit Test after watching this video! I cannot find a way to thank you enough ever, thank you so much! You've saved my life and my parents won't beat me tonight

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[@behlogy]

Welcome aboard!

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[@voyage-of-tranquility]

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@@mnahijklphysics with mo Ali, cognito

[@Maria-jl5is]

That was simple and so helpful. Thank you for putting efforts in this video.💗💗

[@w4tanabe16]

Your videos really help me a lot! Thank you so much for this!

[@dilshanifernando4072]

It helped me a lot. Thank you very much!!!

[@sorayanikkholgh3750]

I understand your explanation sooo easily!!!!! Thank you, YOU ARE THE BEST!

[@shaanzayfawwad7114]

Thank you so much, your videos are so helpful! Stay blessed :)

[@behlogy]

Awh you too! :D

[@haiqabukhari6701]

Thankyou so much. So grateful for this. You really cover the topic in depth.

[@BeltramusRooi]

For the carrier protein,it used atp to actively move substances across the membrane,but love your videos loads ❤❤

[@lauraroy9906]

Ma'am, could you please again explain about the part cell recognition. I didn't understand it.

[@ZhengYiQuanPeter]

33:58, Mrs u said that glycolipid helps interacts with water, but a normal phospholipid could do the same thing as long as it has the hydrophobic head, the glyco- group really just doesn't help in interaction with water (i think

[@behlogy]

You mean *hydrophilic head of phospholipid. Yes theres less glycolipid compared to phospholipids. But small things does affect overall stability still. The carbohydrate part of the glycolipid does help by interacting with water. Also, you will find, in general, that multiple things can do the same thing in cells/bodies. We are just made thay way :)

[@caglaaltnoglu3821]

THANK YOU SMMM FOR THESE VIDEOS YOU ARE MY SAVIOUR!!!!!!

[@janji1122]

Thank you sooo much for creating such an amazing video for these topics, I’m stuck in biology but after watching this it really helps me alot in terms of consolidating my knowlegde

[@mnahijkl]

do you know any good chemistry or physics channel like this? Please lmk

[@Suzan557]

@@mnahijkl check out MaChemGuy. It's a great channel for chemistry.

[@voyage-of-tranquility]

@@mnahijkl etphysics!

[@NoibanoMaima]

Very helpful, please do post more videos 🙏🙏

[@eileenkarkon7358]

Wow ,again your videos solved all my problems ❤❤

[@celinenatalie7418]

Thank you, it was very helpful ❤

[@yininghong-p5l]

thanks a lot

[@fatimaarif8392]

I love you miss Beh! you are the best

[@aribahabibullah9480]

Hello. I sincerely admire the way you teach. I have a question though…..For the roles of membrane proteins, are transport proteins, enzymes, receptor for cell signaling molecules, anchoring skeleton and cell to cell adhesion the roles of/are intrinsic proteins?

[@behlogy]

There are many many types of membrane proteins so those are the potential roles, yes! It could be intrinsic or peripheral, depending on the type.

[@Hunn003]

thank you sim do u think taking notes from your video, understanding and doing past paper questions enough to get good marks?

[@behlogy]

Yesss

[@tynofx]

Thank you veryy much for this ...Gracias

[@behlogy]

Glad it helped! All the best for exams :)

[@tempest17703]

Hi Ms, I had a doubt with something you said about the functions of glycoproteins. In the video, you said that only glycoproteins act as receptor molecules, but my textbook and google says that there are glycolipids that act as receptors as well.

[@behlogy]

Im teaching based on the past papers... Trust me?

[@Mnm2911]

I don't know how to thank you ❤❤❤❤

[@jawad480ram]

really helpful ❤️

[@behlogy]

Glad it was helpful! :D

[@user-th3rx2dy9l]

Thank you very much , and I have a question , the book said that Cholesterol is much less common in plant cell membranes and is absent from prokaryotes. In these organisms, compounds very similar to cholesterol serve the same function. so do you have any idea about what are these compounds that is very similar to cholesterol and It is located in prokaryotic cell?

[@behlogy]

I'm not sure and.. You....dont need to know that in detail. Accept it as is, and save memory space for the rest of the syllabus.

[@user-th3rx2dy9l]

@@behlogy I'll do it Thank you very much again

[@Drbuzzyyy111]

Sir please leave a information about videos sufficiency because we have no idea about are they enough or whether not…please :) btw greetings from Turkey !

[@behlogy]

Other than the missing videos for certain subtopics, I do try and cover all of the AS and A2 syllabus! If anything is missing or extra due to the new syllabus, i always note it in the video description.

[@ShahadaMushtaq]

ur literally the best its so helpful and understanding thank u so muchhhhh

[@JoyPrecious-t7k]

Wow thank you so much

[@samsyy-601]

what exactly does phospholipid and proteins are able to diffuse sideways mean?

[@behlogy]

Imagine them swimming around in a pool with their heads on the surface, little legs underneath hahah (but pls use that phrasing. that phrasing is markscheme standard)

[@suleimanali7939]

U are great ❤

[@shaheerairfan299]

at 20:53 y said all transort protein are transmembrane but it said no there are others as well pls clear my confusion

[@behlogy]

I meant... There are other types of proteins which arent transport proteins, which do other stuff, which may or may not be transmembrane proteins. All transport proteins are transmembrane, but not all transmembrane protein must be transport proteins

[@ranianoor4147]

It was helpful thanks💗 God bless youh

[@saviaidres1800]

Thank you for everything you do! I just have a question for the 2022 syllabus are we required to know about aquaporins??

[@behlogy]

Yup. Although not stated in the both previous syllabus and the current one, I have seen several past years about it!

[@saviaidres1800]

@@behlogy Thank you so much for responding, You are awesome. God bless you.

[@shaheerairfan299]

OK thanks y are amazing also i wanted to ask y that if protein is embeded half in cell membrane so wouldn't it be a extrinsic protein ?pls reply me soon

[@behlogy]

Only if it also has a part that faces outside, and not inside.

[@tatedonmafia9849]

I love u guys we have the worst bio teacher ever such stuck up brats that have so much attitude and dont know how to teach or treat their students

[@behlogy]

:')

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Yes found a helpful channel

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Yes! Got a follower

[@ManhalRafeeq]

The exam is tomorrow. Wish me good luck miss

[@toriiramlall6638]

Hi there, are we required to know about triglycerides for as level biology? Great video btw :)

[@behlogy]

Yess

[@fidaislam8311]

can we get the file for this lecture?

[@behlogy]

It's available for purchase at behlogy.sellfy.store

[@ZhengYiQuanPeter]

Also, why glycoproteins are stable even though their hydrophobic glyco- groups can't interact with water?

[@behlogy]

Polysaccharides are not soluble. But some parts of the molecule can ionise or bind with other things to be able to interact with water!

[@ZhengYiQuanPeter]

@@behlogy Thanks! So may be it's the hydroxyl groups that helps!

[@Azazel069]

P : Carrier Protein Q : Transport Protein R : Glycoprotein S : Phospholipid T : Cholesterol

[@behlogy]

yup! more specifically, Q is channel/pore protein :D

[@mafutu3183]

Hello Ms! I encountered a PYQ (MJ/2018/paper 23) where the answer scheme says that fatty acids cross the cell membrane through facilitated diffusion. From my understanding, would it not pass through via simple diffusion as fatty acids are non-polar/lipid-soluble? Thanks :D

[@behlogy]

Hi! Lipid soluble substances can pass through the membrane, through the hydrophobic core made of fatty acid tails. It is water soluble substances that can't pass through the membrane.

[@cowlikesgrasss]

23:07 are these roles of all membrane proteins or only transmembrane proteins?

[@behlogy]

It's a general overview of membrane protein functions. Like the diversity of functions it may or may not have. Diff proteins, diff functions

[@cowlikesgrasss]

thank youuu

[@avocadobeer7808]

where i can get the slides ? wonder know...

[@behlogy]

Hi there, Thank you for your interest. My notes are available for purchase at www.genesisorigo.com/cambridge-a-level-biology As part of behlogy's launch on GO, both Paper 3 & Paper 5 Essential Guidelines are now available as a FREE resource for a limited time only! You just need to register on the site. After registration, you may "enrol" for the notes or resources you would like to purchase. More instructions are found at genesisorigo.com/a-level-resources-guide-to-enrollment Thanks for your support and all the best with your studies! - Ms Beh

[@joethecreeper8178]

Miss i have to ask something....... Like in a month or two.....i am going to start my As level so ive decided to like cover 4-5 chapters before going to college......i have studied the 1st 3 chaps of bio (not in that much detail) and i have to ask......is the syllabus of As lvl biology about 10 times harder than o lvl biology.....because if there is so much details to memorize...i might consider picking maths instead of bio.....or is it because i have not entered college yet so that is why im finding difficulty in the course? Please help

[@behlogy]

The answer is yes. There is a hugeeee gap btwn a level and o level biology. but there is also a huge gap btwn a level and o level maths. No short cuts, it's hard work, whichever subject you take, even for the top students.

[@rangineechoudhury3755]

[@ZainabHussain-cg9nx]

is this for AQA ?

[@behlogy]

Cambridge a levels! But it may have some overlap with AQA

[@mohammedalkasas654]

do we need to structure of extrinsic protiens?

[@behlogy]

Nope

[@chess0033]

Miss are 3 months enough for me to cover As bio syllabus?

[@behlogy]

when there is a will, there is a way! it's hard work but i do think it's possible.

[@yunussicakozul2223]

Hows it going?

[@eaststreets]

I think 3 weeks is enough lolol

[@chemmy8062]

@@eaststreets I am gonna complete under 2 weeks by completing 1 chapter a day

[@eaststreets]

@@chemmy8062 best of luck you can do it :]

[@shaheerairfan299]

also you didnt cover the co transport

[@behlogy]

Co-transporters are carrier proteins. So the mechanism is the same! It's just that it transports two different molecules at once.

[@Amedosthetics]

revision too! I am free to play coc now

[@neelumnundloll664]

Hi. I will have a test in a few hours and I need study tips.

[@behlogy]

Just do your best! All the best

[@l.anne0568]

thank u smmm

[@shaheerairfan299]

umm 😕i dont understand can y explain me more clearly ??

[@behlogy]

Transmembrane protein goes through the entire phospholipid bilayer. It has a part sticking out of the outer layer of phospholipids and a part sticking out of the inner layer. Extrinsic proteins, however, has a part within the phospholipid bilayer, and a part sticking out of the outer layer only. Does not have a part sticking out of the inner phospholipid layer.

[@aasthaanirjit8561]

thank you so much❤️ It is really helpful.