A level Biology: Post your doubts here!

[Busy Buddy]

Assalamualikum

Can anyone write me a short note on : role of memory cells in long term immunity.

Thanx a bunch & best of luck to all the Bio candidates tomorrow

 

[kitkat <3 :P]

IF YOU R ASKING FOR FULL EXPLAINATION then:-
You could refer to this image http://img.tfd.com/ggse/98/gsed_0001_0019_0_img5180.png
Or writre -Oh from Termina -COOH (carboxylic group)
and H from Amine group (NH2)
Combine to produce water and C links With N.
Refer to diagram if you dont understand !

It was a 4 marks question :/ like will this diagram be enough
btw i understood it ty

 

[Mohammed salik]

It was a 4 marks question :/ like will this diagram be enough
btw i understood it ty

Np... yes.. But if u have time do Put those few points i gave u! just to be SAFE

 

[kitkat <3 :P]

Ok

Np... yes.. But if u have time do Put those few points i gave u! just to be SAFE

tysm

 

[Mohammed salik]

Ok

tysm

Bus do Pray for Me nd Everyone!

 

[kitkat <3 :P]

Bus do Pray for Me nd Everyone!

Sure u too

 

[Exo_luhan]

I wish I could rotate it 90*

There is a major mistake in your answer which i must clarify.U have mentioned "plasma cells produces memory cells and antibodies" which is completely a false statement and will be penalized.After clonal selection,specific B-lymphocytes are stimulated which divide by mitosis into memory cells and plasma cells.Plasma cells produce antibodies against the parasite and memory cells remain in blood and divide into plasma cells and more memory cells if the same antigen is reintroduced in the body.

Daem :O thnks so much

 

[Exo_luhan]

Well you answer is correct but you don't need to add the last line, B-cells develop into plasma cells upon next attack, which is ok but doesn't needs to be there. Because they only want how antibodies are produced. I guess you need to include T-Lymphocyte Cells, not only plasma because B-lymphocytes are activated or stimulated by T-cells, by producing cytokines. So include T-lymphocytes in your answer. You might also want to include Role of macro phage (Antigen-Presenting Cell).
You wrote the right answer i guess instead of B-cells having immunoglobin write T-cells having immunoglobin/receptors to detect the antigen, which then... [clonal selection, expansion], produce cytokines to stimulate B-Cells which develop into plasma and memory cells. Plasma cells .....[functions]
T-Cells should be included in your answer.

thnks alot!!!

 

[Exo_luhan]

do we need to knw about primer and promoters for P2?

 

[thats_me]

do we need to knw about primer and promoters for P2?

No that's for p4

 

[Exo_luhan]

if there is a graph question asking only to discribe....den we just need to wright about the graph trends right????.....noneed to explan the facts like why it happened nd the mechanisms and everythin???

 

[thats_me]

if there is a graph question asking only to discribe....den we just need to wright about the graph trends right????.....noneed to explan the facts like why it happened nd the mechanisms and everythin???

No you don't have to explain unless it is mentioned, but we should include figures from the graph in our answer

 

[VelaneDeBeaute]

Assalamualikum

Can anyone write me a short note on : role of memory cells in long term immunity.

Thanx a bunch & best of luck to all the Bio candidates tomorrow

Someone on Yahoo! posted this.

 

[joanna omar]

What are the required diagrams in each chapter for us to know In A.s ?

 

[Mohammed salik]

What are the required diagrams in each chapter for us to know In A.s ?

1)Cell Surface membranes
2)Mitosis diagrams (general idea)
3)Formation of Polysaccarides
4)formation of Protiens
Thats all i have seen so Far!
Maybe :-
5) Nucleotides (Sugar back bone +phosphate+Nitrogenous base )

 

[joanna omar]

I will try..
The first pathogen was free in Blood so easier to vaccinate against , second one is hidden in RBC.
The second one will have More parasites, hard to kill them all
Vaccination of second one would not prevent Liver damage (lastt one is is from M.S )
And ofcourse you could write in better wording than me !

thanks

Its really weird and I don't even get the Q' either the ans in m.s !

 

[joanna omar]

1)Cell Surface membranes
2)Mitosis diagrams (general idea)
3)Formation of Polysaccarides
4)formation of Protiens
Thats all i have seen so Far!
Maybe :-
5) Nucleotides (Sugar back bone +phosphate+Nitrogenous base )

Thanks even I saw once some cell structure like RER and mitochondria

 

[Mohammed salik]

Thanks even I saw once some cell structure like RER and mitochondria

Welcome sis!
Ohh Yeah i forgot those.. appearence of cell organelles under Electron Microscope!

 

[Mohammed salik]

thanks

Its really weird and I don't even get the Q' either the ans in m.s !

Lol!! Thats why I dont really open markscheme! unless i m compeletely lost !

 

[waleed302]

Does Rhizobium require anaerobic conditions to fix nitrogen?