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

All of the content that you need to know for the "Cell recognition and the immune system" chapter of AQA A Level Biology. The content crosses over with other exam boards too. I get straight to the facts with no waffling. Content includes: cell recognition, phagocytosis, cell-mediated response, humoral response, vaccination, monoclonal antibodies and the ELISA test.
I also go through a few exam-style questions and their mark schemes.
Images taken from:
BioNinja
Study Rocket

[@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!!!

[@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 🙂

[@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 🤩

[@SH-bt3rw]

Thank you SOOO much for this video!!

[@manalbani5447]

omg your a life saver, thanks!❤

[@django5794]

This was really helpful thank you!

[@AlevelBiologyHelp]

You're very welcome!

[@olusk6457]

What an amazing video

[@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

[@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! :)

[@katietaylor2804]

very helpful, thank you

[@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! ☺️

[@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!!

[@DG-yw8fb]

Helpful thank you

[@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

[@user-jg3jb8rp7g]

Thank you😊

[@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...

[@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 :)

[@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. :)

[@jenicejacob8786]

Soooo helpful !

[@AlevelBiologyHelp]

Glad I could help i

[@yuniqecrypt7818]

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

[@AlevelBiologyHelp]

Hi, this was mentioned in the antigens section :)

[@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 ☺️

[@gaanavmanyam9214]

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

[@AlevelBiologyHelp]

Just what I mentioned in the video :)

[@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:)

[@sophie-np2cx]

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

[@jayhoa8249]

No

[@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!!

[@MohammedHussain-ss6kj]

is this vid for AS or A level

[@AlevelBiologyHelp]

AS, but could be included in paper 3

[@user-iy6zt3gv2e]

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 😁