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A level Biology: Post your doubts here!

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Mohammed salik

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Busy Buddy

Busy Buddy

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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 (y)
 
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kitkat <3 :P

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Exo_luhan

Exo_luhan

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BeBeskii108 said:
I wish I could rotate it 90*
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princeali97 said:
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.
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Daem :O thnks so much
 
Exo_luhan

Exo_luhan

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MiniSacBall said:
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.
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thnks alot!!! :D
 
Exo_luhan

Exo_luhan

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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

thats_me

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Exo_luhan said:
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???
Click to expand...
No you don't have to explain unless it is mentioned, but we should include figures from the graph in our answer
 
joanna omar

joanna omar

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Mohammed salik said:
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 :p
Vaccination of second one would not prevent Liver damage (lastt one is is from M.S :p)
And ofcourse you could write in better wording than me :p!
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thanks :)

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

joanna omar

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Mohammed salik said:
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 )
Click to expand...

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