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How was the AS level biology exam paper 11 and 12 ?
Hey anyone can help?
June 2004 q33
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s07_qp_1.pdf
can someone pls tell me how question 1 is B? im confused :/
convert all the units into metre (reduces confusion)
so, 750nm= 7.5x10-7
and 15um= 1.5x10-5
then just divide them 1.5x10-5 / 7.5x10-7 = 20
ohh lol that was easy..thanks so much!
A graft of tissue, such as skin, from a different person is usually rejected by the body.
Which statement about graft rejection is correct?
A The graft is rejected by B-lymphocytes because they make and release antibodies which react with the surface antigens on the graft cells.
B The graft is rejected by B-lymphocytes because T-lymphocytes are not stimulated to produce antibodies.
C The graft is rejected by T-lymphocytes because the graft tissue causes T-lymphocytes to release antibodies.
D The graft is rejected by T-lymphocytes because they circulate in the blood and can gather at the graft site.
Answer is D why?
convert all the units into metre (reduces confusion)
so, 750nm= 7.5x10-7
and 15um= 1.5x10-5
then just divide them 1.5x10-5 / 7.5x10-7 = 20
Here is a table that you might find helpful. better memorize it because i m pretty sure questions from this table comes every year.
Ps- easy way to memorize about alveoli is to keep in mind that the function of alveoli is only exchange of gases. so the rest of the materials are not needed here.
That Table was really helpful do you have such kind of other useful information??
Guys im finiding paper 1 so tough. i am repeating it this year and i still have it as a big problem any tips?
Hey anyone can help?
June 2004 q33
8 should be D coz Starches do not react or react very poorly with Benedict's reagent, due to the relatively small number of reducing sugar moieties, which occur only at the ends of carbohydrate chainshttp://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s06_qp_1
someone please help in. q: 8,16,17,20,23,22,24 and 25.
16 should be C coz larger the size of molecule lesser is diffusion same with diffusion.http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s06_qp_1
someone please help in. q: 8,16,17,20,23,22,24 and 25.
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