TRANSPORT ACROSS MEMBRANES: A-level Bio. Simple & facilitated diffusion, osmosis & active transport

[@finlaywilliams4746]

My exam is tomorrow and I don’t know what I would have done over the two years without these videos. THANK YOU SO MUCH!

[@aliyah9895]

Hello Miss Estruch, I just wanted to let you know how incredibly helpful your videos are. This is probably the most helpful channel on youtube when it comes to A-Level biology. Thank you so much for the amazing content!! Its very much appreciated by me, a new year 12 biology student.

[@MissEstruchBiology]

Hi Aliyah, Thank you for such a lovely comment. Really pleased to hear they are helping you at the start of your A-levels :D

[@emmafive2647]

Four days till my exams and I just wanted to say you literally saving me . Your following l the spec points and not going into extra detail which is amazing for last minute revision. Going to look into your other videos . Fingers crossed I do well on my upcoming test . YAAAY

[@MissEstruchBiology]

Good luck for your exams Emma 🤞🤞🤞 Really pleased they are helping you! Check out the exam paper tip papers too if your exams are being modelled on typical papers.

[@konradgrotthuss7140]

How did it go?

[@shortcake841]

Miss I don’t even have any words to express my gratitude. Like your videos help sooooo much more than you could possibly imagine. To read the chapter in the book, takes hours and I don’t understand nothing much. But your videos make me understand ALL that’s included in my chapters, (even more than what’s in the book which helps me understand the book content better) that too in a very short time!!! Honestly, thank you so so so much.

[@MissEstruchBiology]

oh wow! Thank you so much for your message. I'm so happy that my videos are helping understand to well 😁😁😁 Textbooks can be soooo wordy and extra info, that's why I made my concise A level notes covering only what is needed

[@emmafarndell6851]

Your videos are actually saving my grades, thank you so much for taking the time to make them!!!

[@MissEstruchBiology]

Aww thank you! So pleased the videos are helping you. Good luck :D

[@emmafarndell6851]

My year 13 biology mock is tomorrow so I'm really hoping I've done enough to get my predicted grades, thank you!

[@MissEstruchBiology]

Fingers crossed for you 🤞

[@OnCoated]

This does put a smile on my face

[@kylielawson3271]

i wish i found you earlier, your helping me out big time! the best youtuber for biology

[@MissEstruchBiology]

aww thanks Kylie, so glad you are finding the videos so helpful! Best of luck with your studies! 😊

[@jasonsingh9698]

So is a phosphorylation reaction an example in the membranes. When molecules (ie glucose) bind to the carrier proteins, ATP is hydrolysed into ADP and Pi, and that Pi attaches onto the carrier protein causing it to change shape.

[@tommartineau4654]

whos here before bio exam tomorrow?

[@Fostinah-uf6nh]

Me

[@sumayaali537]

@@Fostinah-uf6nhsamee😢

[@asmailyas2618]

More like bio exam in half an hour 😫

[@tommartineau4654]

good luck

[@0x1_chips]

Hi, on the aqa specification it says we need to know simple diffusion but in brackets it says (involving the limitations imposed by the nature of the phospholipid bilayer) What is meant by this?

[@MissEstruchBiology]

Hello, This is referring to knowing what types of molecules simply diffuse through the phospholipid bilayer (e.g. only small, lipid-soluble/non-polar molecules). By 'nature' they are referring to the hydrophobic head and hydrophilic tails of the phospholipids. Hope this helps.

[@salma1-y6d]

what's the difference between the 'cell-surface membrane' and the 'plasma membrane'? or are they the same thing?

[@ebereharrieth9159]

Thank you for helping me understand this 🙏🙏

[@MissEstruchBiology]

Ah so pleased it helped you understand! 😊

[@liambyrne8869]

is this everything we need to know for this topic?

[@MissEstruchBiology]

Yeah it is 😊

[@smashedjamjar]

tbh u slayed this

[@MissEstruchBiology]

thank you!

[@deborahwest4671]

Hi Love your videos! May I ask whether you go over the beetroot experiment in any of your videos? or a video on the experiments needed for AQA? thank you

[@domanidouglas9192]

I might not fail anymore... Thank UUUU

[@MissEstruchBiology]

😄 YES! Keep putting in the hard work and I'm sure you'll ace it.

[@domanidouglas9192]

@@MissEstruchBiology Thank you! I hope so, my exam is tomorrow, but I've been studying for a month!

[@MissEstruchBiology]

@@domanidouglas9192 Good luck for tomorrow!

[@adailyfact]

How did it go?

[@domanidouglas9192]

@@adailyfact I got a B :)

[@shadowallison7317]

Hey, just curious. On 07:44, for the solution definitions. Hypertonic is when the water potential of a solution is more negative than the cell, let's say a question pops up asking what a hypertonic solution is. Would I get the mark if I put "A hypertonic solution is when the cell has a higher water potential than the solution". It's the same thing isn't it? Or like, do I have to use specific terminology on that one?

[@MissEstruchBiology]

I wouldn't use 'higher' I'd stick to saying either more or less negative. Pure water had a water potential of 0, so all other water potentials are negative. That's why we say more or less negative. Hope that helps ☺️

[@shadowallison7317]

@@MissEstruchBiology Hypertonic is when cells shrivel up so the water potential of the solution is more negative than the cell. And vice versa for hypotonic?

[@magicofeducationeducationalvid]

Helpful video, Good job.

[@MissEstruchBiology]

Glad you think so! Thank you!

[@skyestellar3653]

How are channel proteins specific to what ion they transport? Thank youu

[@MissEstruchBiology]

Its due to the unique 3d shape proteins have, so only certain molecules can fit through.

[@nobleawusanya]

WoW Thanks so much I love your videos

[@MissEstruchBiology]

You're so welcome 😁 Glad you like them

[@moa7651]

Is osmosis also till equilibrium is reached

[@MissEstruchBiology]

Yes 😊

[@moa7651]

Thanks!

[@mohid0786]

Hey, you know on 01:33 do we have to include the equilibrium part to gain all marks?

[@MissEstruchBiology]

Hello, the definition for diffusion is rarely asked at A level, more likely to be a marking point in a longer question or something to discuss within the essay. And in those instances the more detail you give the better, but if you are asked for a definition the main two points would be that it is passive and its the movement of particles from an area of high to low concentration. Hope that helps :)

[@yussuf3014]

Is this for AQA?

[@MissEstruchBiology]

yeah

[@yussuf3014]

@@MissEstruchBiologythank you so much

[@rehanabokhari4482]

Nice From Pakistan

[@MissEstruchBiology]

Thank you!