CELL RECOGNITION + THE IMMUNE SYSTEM - AQA A LEVEL BIOLOGY + EXAM QUESTION RUN THROUGH

[@AlevelBiologyHelp]

00:35 = Cell recognition and antigens 02:50 = Phagocytosis 05:28 = B and T cells 06:06 = Cell-mediated response 07:09 = Antibody structure 08:47 = Humoral response 12:00 = Vaccination 13:51 = Active and passive immunity 14:55 = Monoclonal antibodies 16:00 = ELISA test 18:09 = HIV structure and replication 21:05 = How HIV causes AIDS 22:28 = Why antibiotics are ineffective against viruses 23:06 = Exam questions and mark schemes

[@rubygrellier9163]

you are actually a lifesaver!! this helped me so much, thank you!!!

[@betul-ev2fu]

if you film these type of videos for *CAIE exam board* , believe me tons of ppl would come here and start watching your videos since our online recources for CAIE(CIE) is veryy limited 😔. anyways, still love your videos 🤩

[@AlevelBiologyHelp]

In cell-mediated immunity, it is helper T cells that bind to the antigen-presenting cell, but you just need to know it as "T cell" for AQA 🙂

[@django5794]

This was really helpful thank you!

[@AlevelBiologyHelp]

You're very welcome!

[@psychoticrexx]

I have a test on this next week thanks a lot

[@fatoumattatouray806]

This video was so helpful, thank you so much! Do you think that watching your videos and making notes from it as well as using active recall with those notes, spaced repetition and practise questions would be enough for me to get an A* in Biology?

[@AlevelBiologyHelp]

Sounds good to me :)

[@rip_6998]

did u get a star g

[@manalbani5447]

omg your a life saver, thanks!❤

[@Kat.lmr15]

This was SO HELPFUL THANK YOUU

[@SH-bt3rw]

Thank you SOOO much for this video!!

[@Tristilax]

Great video, very helpful and concise! Do we need to know the two main types of phagocytes for AQA (Macrophages and Neutrophils)?

[@AlevelBiologyHelp]

That isn't necessary for the exams, but when you come to do the synoptic essay in A2, you could mention those as it would count as extra reading so you'll get higher marks! :)

[@olusk6457]

What an amazing video

[@kunchaako3848]

do you think just revising and taking notes from this and doing exam questions is enough revision? Love your videos thank you

[@AlevelBiologyHelp]

Sounds good to me! Make sure that you do plenty of active recall with your notes though! You could make flashcards, with a question on one side (e.g. what is the structure of cellulose) and the answer on the other side! Do as many exam questions as you can too! ☺️

[@displayfail5432]

i just saw this video for my paper 3 tmr, and when i saw the whooping qn i realise it came out for my paper 2 exactly...

[@katietaylor2804]

very helpful, thank you

[@aneesakahn7728]

Whats the difference between self and non self? Great video

[@AlevelBiologyHelp]

Self is just another word for your body's own cells, and non-self is another word for foreign substances ☺️

[@aneesakahn7728]

@@AlevelBiologyHelp are all foreign substances bad for the body?

[@AlevelBiologyHelp]

@@aneesakahn7728 Yes, if the body recognises it as foreign, which would initiate an immune response ☺️

[@SonikaStudy]

Thank you😊

[@jayhoa8249]

Hi miss do you need to know the fact that antibiotics target the bacterial ribosomes and enzymes?

[@AlevelBiologyHelp]

Hi, yes I would recommend knowing that. :)

[@DG-yw8fb]

Helpful thank you

[@Sohamsta]

Hi is your cells playlist completed fully or will you add more videos or is the content for cells covered entirely already?

[@AlevelBiologyHelp]

Hi, the playlist is complete :)

[@Sohamsta]

@@AlevelBiologyHelp okay thank you!!

[@jenicejacob8786]

Soooo helpful !

[@AlevelBiologyHelp]

Glad I could help i

[@jayhoa8249]

Hey miss what does like mature mean like when B cells mature in the bone marrow , thanks

[@AlevelBiologyHelp]

Hi, it basically means that they develop i.e. grow :)

[@dipure9972]

Hello this is very helpful when can you finish the whole of A level biology please ?

[@AlevelBiologyHelp]

Hi, I have already uploaded every topic for A Level Biology:)

[@ollyharvey5308]

Thanks!

[@khaadi1807]

Hi, thank you very much for the video! Do we need to know that the receptors are CD4 receptors or can we just say receptor proteins on the cell surface of T helper cells?

[@AlevelBiologyHelp]

The specification doesn't mention CD4 specifically but if I were you, I would remember it to guarantee marks :)

[@khaadi1807]

@@AlevelBiologyHelp Thank you!!!!!!!

[@jasonsingh9698]

@Joshwa Roy Name of receptors on t-helper cells. HIV binds to these receptors in order to invade and undergo replication

[@jasonsingh9698]

@Joshwa Roy Np

[@gaanavmanyam9214]

For AQA, do we need to know about both direct and indirect ELISA?

[@AlevelBiologyHelp]

Just what I mentioned in the video :)

[@haleemahaj]

How many hours a week of revision should we be doing at this point please ? As a year 13

[@AlevelBiologyHelp]

Hi - it honestly differs for each person (might make a video on this?). I would recommended 2 hours outside of lessons on weekdays and about 5-6 on weekends. If you have extracurricular activities, then please keep them up as they are so important for your wellbeing and sanity!!

[@sophie-np2cx]

isn't clonal selection when the antibodies attach to the antigen?

[@jayhoa8249]

No

[@yuniqecrypt7818]

Im not sure if i missed but was antigenic variation mentioned?

[@AlevelBiologyHelp]

Hi, this was mentioned in the antigens section :)

[@MohammedHussain-ss6kj]

is this vid for AS or A level

[@AlevelBiologyHelp]

AS, but could be included in paper 3

[@SofiyaPretty]

lam getting interested and want to know more. 9:30pm

[@mattharris1930]

its pronounced fay-go-site

[@AlevelBiologyHelp]

Haha I tend to interchange between both pronunciations 😁

[@ij9349]

Shut up