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hey! does anybody have all the past paper questions topic wise?? it would be really helpful if anyone could share them !
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yeah i know that, but can u explain me how we get the expected number for october/november 2011 paper 53, Q2 b) ii. there's no ratio given hereexample.....u performed a cross and ratio of one trait to other is 3:1......so if total number is 100 then expected number wud be 75 for one trait and 25 for the other one....its just based on the percentage obtained after doing a genetic cross
assalamoalaikum wr wb!yeah i know that, but can u explain me how we get the expected number for october/november 2011 paper 53, Q2 b) ii. there's no ratio given here
.when making antibodies using hybridomA method.....we test for the cells producing antibody>>>but i dont understand why we r doing this when we have got hybridoma cells since .....alll the cells should be producing antibodies? is it because not all the cells wud have fused to form hybridoma cell??
I can't seem to find the answer in the Biology Guide ; the marry jones guide....
if any 1 finds the answer to this question in the guide pls post the page number regarding the topic form the question.......
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THANK YOU!!
in advance!!!
Hello. Yes, mRNA undergoes some stages after it leaves the nucleus & enters the cytoplasm.another question i am unable to answer!!
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please give me the answer to this question
i mean does mRNA have stages after it leaves the nucleus and enters the cytoplasm of a cell????
Hello. Yes, mRNA undergoes some stages after it leaves the nucleus & enters the cytoplasm.
After the mRNA leaves the nucleus and enters the cytoplasm, a ribosome covers 2 codons of the mRNA.
Two aminoacyltransfer RNA bind to mRNA according to complementary base pairing of the anticodon (found on the aminoacyltransfer RNA) with the codon (found on mRNA).
Two amino acids are synthesised. A peptide bond forms between them. One aminoacyltransfer RNA leaves the ribosome and the latter covers another codon on the mRNA.
Hope my answer has been helpful to you.
Well, I've racked my brains & got the answermay i ask from where did you get this answer...
i mean do u hv any study guides or any othr good reference books?????
bcz i hv only the Biology Revision Guide by Marry Jones
Well, I've racked my brains & got the answer
I recommend you this book, which I use at school:
And this one: AS/A level Biology by Mary Jones, Richard Fosbery, Jennifer Gregory and Dennis Taylor. Its a black book with a green banner on top.Do you have this one?
Humm... Has my answer helped you?
Okay! ^^think my liked answered your question!
yes i have the text bt i find it confusing!!
can u post a cover page of that bookOkay! ^^
I use another one but i don't know if it will b available in your country.
Biological science by D. Taylor, N.P.O Green, G.W stout and Soper. The third edition.
the vaccination is not given in the first few months after the baby hatches because his B and T Lymphocytes haven't yet matured so not being able to carry out a effective immune response, secondly in the first few months the baby carries the antibodies passed on by the mother via placenta. so he is temporarily immune for this period of time. immune system is in the process of developing...i have another doubt and these doubts are from 2011 may/june paper 21
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i posted the image so that it wud b easier 4 the person willing to answer it can c it !!
the vaccination is not given in the first few months after the baby hatches because his B and T Lymphocytes haven't yet matured so not being able to carry out a effective immune response, secondly in the first few months the baby carries the antibodies passed on by the mother via placenta. so he is temporarily immune for this period of time. immune system is in the process of developing...
c) u just need to explain the data given above. comment on it like you can see that at 90% of children being immunised the death rate is very less and ahead of it's very low as well. before 90% u can see a great variation in the mortality rate of under 5 years children. at 95 % the death rate is less then 50 deaths per 1000 children. so this supports the recommendation of WHO to immunise children in different districts up to 90 % or more.
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