PLASMA MEMBRANE structure and function: Phospholipid bilayer for A-level Biology. Fluid-mosaic model

Learn the structure of the plasma membrane, which makes up both cell surface membranes and organelle membranes. Learn the components (phospholipids, cholesterol, proteins, glycoproteins and glycolipids) and how these make the membrane partially permeable.
For revision resources to help super boost your grade:
1) THE COMPLETE REVISION BUNDLE
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[@aaliyahrayaz]

Saving me right now. Mocks are approaching and i making notes alongside your videos and they’re being maintained inside my head. I’M SO GLAD YOU’RE STRAIGHT TO THE POINT ! You don’t even lack the detail needed when answering exam questions so really means a lot. Thank you, thank you x

[@MissEstruchBiology]

Good luck for your mocks!!! Really pleased you like the concise style of the videos 😊😊

[@hi-ot3dt]

how did u do ???? i have mocks in a week as well :(((

[@shazmeertv44]

@@hi-ot3dtshut up

[@NameyaAmutenya]

Same here

[@ChicaCherryCola87]

These vids are waaaay underrated!!! You're amazing. Thanks for this!!!

[@MissEstruchBiology]

aww thank you! Really glad you like them ☺

[@ayesha1929]

My exam board is OCR A but these videos are very helpful even though they're designed for AQA. There are not a lot of good channels that make videos specifically for ocr a :(

[@Heejinbunny]

:(

[@coreywilko9418]

i’m also on ocr a, pls lmk if you’ve found any good places for info!!:)

[@Rayaann]

​@@coreywilko9418fr, there's none 😭

[@demarcusjamesbartholomewth8611]

BRO FREESCIENCELESSONS COVERS AQA OCR AND EXECEL AND MAKES VIDEOS SPECIFICALLY FOR OCR TOO I RECCOMEND HIM EVEN THOUGH MISS ESTRUCH IS BEST FOR AQA@@coreywilko9418

[@shazmeertv44]

Ocr is for dumb people

[@user-yx1ri7re4u]

You teach really well i appreciate what a wonderful teacher you are 🎉❤

[@MissEstruchBiology]

Thank you!!!!

[@sagharusman3815]

Watching all your videos for my may assessments haha

[@MissEstruchBiology]

Love that! Best of luck :D

[@0x1_chips]

Thank you for this video, we went over this very briefly at school and my notes had lots of gaps! Are your videos specific to the biology a level aqa specification?

[@MissEstruchBiology]

You're welcome, hope they are helping you. Yes, all my videos are tailored for the AQA Biology specification.

[@0x1_chips]

Thank you!

[@saarahtaayibah8294]

So are glycolipids lipids attached to a peripheral protein or a carbohydrate attached to phospholipid bilayer?

[@rehanabokhari4482]

Nice video and pic Also nicely explained thanks From Pakistan

[@MissEstruchBiology]

Thank you!!!! So happy it helped

[@jakubsypien5090]

You are awesome

[@MissEstruchBiology]

Thank you!

[@stevejones3662]

Hi Miss Estruch. Great work!! So helpful. 1 question: Do sodium ions not cross membranes due to their charge or their size?

[@shrim6161]

amazing video!!! loved it xoxoxo my cat died today.

[@rinteaa]

cool i ate it xxxxxxxx

[@MissEstruchBiology]

Glad you liked the video. Sorry to hear about your cat 🐈 😢

[@Dz-nn9gt]

Why can't my teachers be this efficient

[@MissEstruchBiology]

ahh glad it was helpful ☺️

[@tominaomi]

what aqa spec point is this?

[@Agirl3216]

hello, I enjoy your videos they hit exactly the spec. however, I have a question, isn't water a polar substance? so it shouldn't pass through easily right?

[@MissEstruchBiology]

Thank you :) Water is dipolar, but due to the hydrophilic head on the phospholipid, which attracts water, it can enter the membrane.

[@0x1_chips]

But wouldn’t the hydrophobic tails not let the water through?

[@Agirl3216]

A M that’s what I was about to say... It should be able to diffuse just not through the membranes, an integral protein rather

[@MissEstruchBiology]

@@Agirl3216 Water can diffuse through the plasma membrane directly, and through aquaporin proteins. www.quora.com/How-does-water-diffuse-a-membrane this has a good image of this.

[@MissEstruchBiology]

@@0x1_chips The hydrophilic heads attract the water into the middle of the bilayer. The hydrophobic tails do then repel the water, but they repel the water to the other side of the bilayer, helped by the opposite hydrophilic head attracting it. This enables water to pass through, also helped by it being a very small molecule.

[@ishxya]

thank you so much for ur videos theyre really helpful! i just have one question you know how it says peripheral proteins can bind to make glycoproteins and glycolipids im a bit confused because peripheral proteins are proteins so how can they make glycolipids😅

[@Dz-nn9gt]

They attach to carbohydrate

[@millieevans204]

how can water pass through if it’s a polar molecule i thought the whole point is that the fatty acid tails r hydrophobic and they repel water

[@MissEstruchBiology]

Hey, there are protein channels (aquaporins) that water can diffuse through because it is such a small molecule. As it is so small it can diffuse through the membrane too. It can dissolve in the charged hydrophillic heads, and the hydrophobic tails repel the water to the other side of the membrane. Hope that helps.

[@user.004]

Hi do we need to know the individual characteristics of the phospholipids? e.g. phosphate group, the charges, the fact that the tails are made up of saturated and unsaturated fatty acid chains?

[@MissEstruchBiology]

Hey yes you do. You can find the information on that in my lipids video ☺️

[@user.004]

@@MissEstruchBiology Oh okay thank you x

[@user.004]

@@MissEstruchBiology miss estruch i have 1 more question, i watched one of your protein structure videos and you made no reference to globular/fibrous proteins and i understand its not on the spec but do you still its worthwhile to learn the information?

[@hermionegrangerboi3084]

​No :) @@user.004

[@user-vq4qy2hq5i]

Are the peripheral proteins the same as the carrier proteins and the the integral proteins are the same as the protein channels?

[@SN-cx2gg]

No, both carrier and channel proteins are known as integral proteins as they're both involved in the transport of molecules across the membrane

[@Moe.6770]

Hi you know when you mentioned there was no diagram of a channel protein did you mean a carrier one?

[@MissEstruchBiology]

ah yes, I did! I say channel twice don't I 🤦🏻‍♀️

[@Moe.6770]

@@MissEstruchBiology No worries your explanation was so good it helped me a lot!

[@lilac_turnip4767]

Are glycoproteins peripheral or integral?

[@MissEstruchBiology]

usually peripheral

[@lilac_turnip4767]

@@MissEstruchBiology thank you 😊

[@MrMidoo2010]

Ohh,Ma'am one week without videos😑🤔 Plez, go ahead. We miss you. "Can i demand a simple order." Hope if you don't mind you have a time to teach me online, Some methodolgy, how to teach different levels of IGCSE biology. Even one hour per week.

[@MissEstruchBiology]

Hello! I'm afraid due to the change in working style because of schools closing, due to the coronavirus, I am only finding enough time to make one video a week at the moment. That is really flattering that you would like some support, and I am sorry I am not to be able to offer these lessons, but unfortunately, I am stretched to the limit with work and don't have any extra time I could do this in.

[@MrMidoo2010]

@@MissEstruchBiology ok, I appreciate this Miss. Don't over load yourself ,and stay safe. Thanks for your care to reply.

[@MissEstruchBiology]

You too, keep safe during these times!

[@MrMidoo2010]

@@MissEstruchBiology Inshallah , for all.