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BIOLOGY (AS)

XPFMember

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really i just found out this and felt that this has gud material but after u confirm i'll have to look up into it more!! :)
 
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hey thank u everyone i wish i get an A in the examz..........
really preparing hard..............
:)
 

Dee

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is this book really good? i mean the best for revision for bio? if it is then i need to go the nearest bookstore then.

anyone has an idea on the important topics to study for bio? my bio is a bit lousy and i REALLY wanna improve it.

will be glad if anyone could help :)
 
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As said by everybody, this book ROCKS indeed :D

Above all it's according to the syllabus and covers each and everything related to the syllabus. So BUY it ! :)
 
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Please help! M/J 2012 paper 12 question 35 Link: http://www.smarteduhub.com/files/documents/9700_s12_qp_12.pdf

The graph shows the amount of antibody produced in response to an antigen. From the graph, which statement is correct? A It takes 25 days to achieve active immunity. B Memory cells for this antigen are present in the body within 20 days. C T-helper lymphocytes are activated on day 12. D The second exposure to the antigen occurred on day 25

How come the answer is B??
 
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