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AS Biology P1 MCQs Preparation Thread

enchanted era

enchanted era

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Trevor Jts said:
Hey anyone can help?
June 2004 q33
Click to expand...

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. :)
 

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Jinosupreme

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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?
 
enchanted era

enchanted era

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Jinosupreme said:
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?
Click to expand...

its a fact, memorize it :p elaborating and finding logical explanations will lead to something beyond our level i guess :p. the fact is t-lymphocytes are responsible of dealing with graft tissues may be because they got the killer cells and b-lymphocytes releases antibodies which got no complementary binding sites to the antigens of graft cells :/
 
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Rosy S

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enchanted era said:
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
Click to expand...
enchanted era said:
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. :)
Click to expand...

That Table was really helpful do you have such kind of other useful information??
 
♣♠ Magnanimous ♣♠

♣♠ Magnanimous ♣♠

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